Vue Lifecycle Hooks

js below the comment // setup fake backend. How to Use Vue Instance Lifecycle Hooks. 6, released February 2019, errorCaptured and errorHandler will capture errors thrown inside v-on handlers. The official documentation is well written and covers everything a developer needs to build a Vue app. Now's the perfect time to explain the quotes in the ‘lifecycle methods’ from the introduction. Directive and component instances have a lifecycle as Angular creates, updates, and destroys them. One of this features is the lifecycle hooks. They allow users to add stage-specific code. js course featured in this preview video. com/watch?v=NBi6mUeInmk. First of all, let’s quickly rehearse how Vue. js API reference for the full list of instance properties and methods. This listener will begin and stay running when the SisterCard. Note that all lifecycle hooks in 2. Developer Tools. Consult the Vue. I'm using Laravel elixir to bring in the script and I have the jQuery function wrapped up in the Vue ready hook but I think this is running before the script is bought in since if I open up the console on page load, I get an. With this approach we fetch the data before actually navigating to the new route. At each of these key moments the instance will emit corresponding events, and when creating an instance or defining a component, we can pass in lifecycle hook functions to react to these events. com – Examples ,The best For Learn web development Tutorials,Demo with Example!Hi Dear Friends here u can know to Vuejs Application LifeCycle – vue component LifeCycle hooks. If you are new to Vue, there might be a couple of unfamiliar concepts here. import Vue from 'vue' import HighchartsVue from 'highcharts-vue' Then, register the wrapper on the global scope using Vue. Lifecycle hooks are the defined methods which get executed in a certain stage of the Vue object lifespan. It is useful to. The power of Snapshot Testing in Vue. All lifecycle hooks automatically have their this context bound to the instance, so that you can access data, computed properties, and methods. Learn what is the software development life cycle. Managing state in large web apps can be messy—and Vue. Not to be confused with Lifecycle Hooks, Hooks were introduced in React in v16. In this component, we are fetching asynchronous data during the component created hook. Introduction to Vue. You can also notice that the lifecycle methods are imported so it should allow for better linting for those of us that misname the functions at times ; ). directive('sticky'); When we want to use this custom directive on a DOM element it will look like: Now that we have created our first custom directive, we now need to create the code behind it. Some examples for core hooks: pre-tag, post-tag, pre-import, post-import, pre-export, post-export. Testing lifecycle hooks Build Setup # install dependencies npm install # serve with hot reload at localhost:8080 npm run dev # build for production with minification npm run build # build for production and view the bundle analyzer report npm run build --report. js Single-Page App with Vue Router. That’s all Vue lifecycle methods are and nothing more. Starting from the initialization, to when it gets destroyed, the object follows different phases of life. However, for other Firebase services that can be deployed with the Firebase CLI , the firebase init command creates specific files where you can define settings for those services, such as an index. Another important topic to discuss in a Vue introduction is Vue's lifecycle hook. Not to be confused with Lifecycle Hooks, Hooks were introduced in React in v16. Application Lifecycle Application Management The application module lets you manage the life cycle of your NativeScript apps from starting the application to storing user-defined settings. Vue router Programmatic navigation How to access the dom nodes in VueJS using refs Vue Router Dynamic route matching tutorial Learn Vue. In the image above you see the 'mounted' property in the Vue instance. If the mouse hovers over the span element with data-descr attribute, the tooltip will appear and the content of the tooltip is the texts in data-descr attribute. สวัสดีครับ ใกล้เข้ามาแล้วกับงาน Vue. You also notice that the lifecycle Hooks available for every Vue instance is accessible inside Vue Hooks, some of them are: useData: handles initialization of data inside your Hook, so the count is initialized inside it. Los lifecycle hooks nos dan la capacidad para intervenir en el ciclo de vida de las instancias de Vue que están en nuestra app. Below we are providing a pictorial representation of lifecycle diagram of Vue. Note that all lifecycle hooks in 2. created: () => this. js instance data fields. Here is how you can create a simple functional component. to make it easy to include new Vue / React components or Angular modules from your favorite templates (for example, sails generate component or sails generate ng-module) If you are interested in making custom generators, the best place to start is by checking out the introduction to custom generators. Loading Unsubscribe from Tiago Matos? Cancel Unsubscribe. We need to set the maxCharacter data property to the value of the limit prop when the component is initialised. Lifecycle Hooks. They start with "before" prior to the actual hooks and are fired before the actual hooks. Scalable data visualisation with D3 and Vue Ramona Biscoveanu 11:00 - 11:30 30mins A new Router to guide your Apps. Create an ImageSelect component on top of vue-multiselect 6. So transferring old bindings into new directives isn't too difficult. Every Vue instance will have to go through series of initialization when it is created, for instance it will set up data observation, it will need to compile the template, then it will need to mount the instance to the DOM, and finally it has to update the DOM once there is change in the data. errorHandler hook. Taha is a full stack web developer. It serves as a centralized store for all the components in an application, with rules ensuring that the state can only be mutated in a predictable fashion. Lifecycle-wise, it is called after the beforeCreate hook and before the created hook. js for better performance 16. This makes React Hooks an exciting technology. JS 24 Introducing Vue CLI 25 Introducing Vue CLI Walktrough 26 Vue Snippets 27 Lifecycle Hooks 28 introducing Nuxt 29 Nuxt. When to Unsubscribe in Angular. September 11, 2019 🕒 1 minute, 3 seconds It's quite a common pattern to initialise a component in a created() or mounted() hook. Instance Lifecycle Hooks Every Vue instance will have to go through series of initialization when it is created, for instance it will set up data observation, it will need to compile the template, then it will need to mount the instance to the DOM, and finally it has to update the DOM once there is change in the data. Learn more about plugins!. Here is how you can create a simple functional component. The div element with ref="tooltip" is the tooltip which shows the hint. js Start Documentation Gallery Demo View on GitHub Documentation. It provides data-reactive components with a simple and flexible API. As the name suggests, the navigation guards provided by vue-router are primarily used to guard navigations either by redirecting it or canceling it. vue files, we must follow some naming conventions in our script tag. React Hooks. Android Platform Guide. Lifecycle hooks. js below the comment // setup fake backend. vue-grid-layout is a grid layout system, like Gridster, for Vue. js Lifecycle Hooks Creation (Initialization) Creation hooks are the very first hooks that run in your component. All lifecycle hooks automatically have their this context bound to the instance, so that you can access data, computed properties, and methods. See also: Lifecycle Diagram. js? All are life cycle hooks in Vue except. The following demo logs out the Vue lifecycle events when a component mounts and updates. All defined hook methods are then called one by one. Starting from the initialization, to when it gets destroyed, the object follows different phases of life. In short: get JSON data from API. The Onsen UI team and your peers in the community will work together to help solve your issues. Moved and resized event listeners can be added, if the only notification needed is when an item is finished moving or resizing. js instance lifecycle hooks. Data fuels these updates. Testing logic inside a Vue. Lifecycle Hooks - Tutorials for Vue. js Common Pitfalls: Accessing DOM from the `ready()` hook Example A common usecase for the ready() hook is to access the DOM, e. With every state change, there many specific moments where certain assets become available. They start with "before" prior to the actual hooks and are fired before the actual hooks. How Vue can help. Life-cycle hooks like mounted etc are instead put in an array. React Hooks also allow for brand-new patterns - e. The diagram below shows the Vue and Vue Router lifecycle hooks that get called by each of the route lifecycles. js Essentials series. js stages of initialisation work. SDLC Phases – Requirement Gathering, Design, Development, Testing, and Deployment. Here is the demo and the final code on JSFiddle. You probably also noticed that pageOffset variable contains a single reactive property:. This listener will begin and stay running when the SisterCard. Lifecycle methods (with the exception of constructor) are hard to reason about. The v-if directive and the Vue Router destroy Vue component instances; however, cleaning up after any third party library should be done manually in the beforeDestroy() lifecycle hook. As you have seen, lifecycle hooks are added at the top level of a Vue instance. js documentation: Components. How to Use Vue Instance Lifecycle Hooks. js コンポーネント入門の第7回(最終回)です。 ライフサイクルフックを紹介します。 前提 PC ブラウザ Node npm Vue macOS 10. As you know, Vue. I'd like to know how before I render a page, I want to send an async GET request to my server to retrieve data and populate the properties in data. NET Core 2 and Facebook Login. Simple Todo Application with. Angular2/4のLifecycle Hooksを理解する Angular2/4のLifecycle Hooksのうち、ngOnInitについて簡単な実験をして、 どのタイミングでngOnInitが発火するのか確かめてみることにします。 Angular2/4のLifecycle Hooksを理解する 前提 0. Renderless Vue. py via pip $. This ensures that data properties you're referencing (i. In such cases, using mocks to set the query string in a test is a good alternative to using a real instance of Vue Router. But a component may also need to perform side effects - for example, logging to the console, sending an ajax request, or setting up an event listener on window. All defined hook methods are then called one by one. • Server-side coding in Node. Dynamic Imports in Vue. For example, the created hook is triggered when the component state is ready, but before the component has been mounted in the page. js stages of initialisation work. He’s written a number of popular Vue articles, and he’s writing a book on how to build an SPA with Vue. directive() and Vue. ES / TypeScript decorator for class-style Vue components. The following is a step-by-step walkthrough of how to set up a basic CRUD app with Vue and Flask. Two less known facts about Vuex 7. We recommend to start new projects with Vue CLI. Testing logic inside a Vue. js is no exception. With BootstrapVue you can build responsive, mobile-first projects on the web using Vue. When you declaratively add or remove a child element, all Animations call specific hooks during the entering or exiting of the element. For all the other cases you should use computed() properties and learn how to use Vue. The namespaces are then trivially shown as a selector through a combination of v-model, v-for and v-bind. However, I’ve seen people questioning the potential usefulness of hooks, given that Vue already has mixins that solve a similar problem. JS EventBus communication Intro to VueJS lifecycle hooks with examples. In the second and last part of this tutorial, I enable routing and create blog as a single page application based on Vue. 0-alpha, and a proof of concept was released for Vue a few days after. Data fuels these updates. If you are new to Vue, there might be a couple of unfamiliar concepts here. vue before create lifecycle hook The vue before create lifecycle hook is the first of many hooks that fire throughout the lifecycle of a vuejs instance. Lifecycle hooks; Methods; Computed props; And anywhere else in the component definition! Conclusion. It was developed by ex-Google employee Evan You in 2014. New v-slot directive in Vue. Mounting (DOM Insertion) Mounting hooks are often the most-used hooks, for better or worse. That is, from the beginning of creating, initializing data, compiling templates, mounting Dom rendering, updating rendering, uninstalling and a series of processes, we call this the life cycle of Vue. If you are new to Vue, there might be a couple of unfamiliar concepts here. Lifecycle hooks help you tap in and perform operations at a given stage of your component life. Lifecycle hooks; Transitions; And more! The best way to learn is by doing, so we'll put this theory into practice and build a simple but powerful eCommerce user interface complete with products and a shopping cart called Vue. For any developer, Hooks allow you to use state and other features of React without writing a class. errorHandler. x is evolving in a way to keep the gap and migration to Angular 2 as small as possible. It seems like yesterday we just celebrated the release of Vue 3. Vue-powered Static Site Generator. For example, if you would like to do some initialization stuff for any external libraries, you can do that in ngOnInit hook. Vue's lifecycle hooks allow more refined control as and when it's required. 0, Vue core 2. And Software development life cycle models. But a component may also need to perform side effects - for example, logging to the console, sending an ajax request, or setting up an event listener on window. vuejs axios exampl. From JavaScript and HTML through to React or Angular, we have it all. # React hooks Hooks are a new addition in React 16. Listen to lifecycle hooks on third-party Vue. That’s all Vue lifecycle methods are and nothing more. Lets see these hooks in action. js Common Pitfalls: Accessing DOM from the `ready()` hook Example A common usecase for the ready() hook is to access the DOM, e. This project-based course will have you coding right away. Firstly, use the created hook to add the listener. For the button, we use the standard Vue approach, a feature here is only the nuance of the initialisation of the Paypal button, for this we use the standard hook mounted of the Vue component. You probably also noticed that pageOffset variable contains a single reactive property:. This hook is not called during server-side rendering. electron with angular desktop application. Warning: This post is over a year old. using affix in Bootstrap 4. Secondly, use the destroyed hook to remove the listener when it's no longer needed to avoid memory leaks. Thus, we can say that lifecycle hooks are points along this journey that each component needs to go through. That is, from the beginning of creating, initializing data, compiling templates, mounting Dom rendering, updating rendering, uninstalling and a series of processes, we call this the life cycle of Vue. js is its instance. The mounted lifecycle hook is prefixed with the async keyword. js Single-Page App with Vue Router. Bir yazılımcının dijital günlüğü: Şehir Notları ve Kod Dünyam. js Lifecycle Hooks lesson. js watcher 15. Let’s see the most common cases that you will need to unsubscribe inside the ngOnDestroy lifecycle hook. Now you should be able to visualize the journey of a Vue instance whenever it is initialized and as well customize you own code using these various hooks or methods should the need arise. js to enable dynamic content in your apps for blogs, pages, and more. Lifecycle methods are only called as a side effect of a m. For bug reports and feature requests use our GitHub Issues page. created: () => this. One of this features is the lifecycle hooks. The following demo logs out the Vue lifecycle events when a component mounts and updates. js Lifecycle Hooks Creation (Initialization) Creation hooks are the very first hooks that run in your component. js instance lifecycle hooks. using affix in Bootstrap 4. import Vue from 'vue'; import { Component } from 'vue-property-decorator'; Finally, add the contact list component. vue component is rendered. Lifecycle-wise, it is called after the beforeCreate hook and before the created hook. js read the Vue. The Vue component uses the beforeCreate lifecycle hook to monintor to the user’s auth state, while sendEmail references the callable function deployed to Firebase. A directive has the same set of lifecycle hooks. js App is ideal for both junior and senior web developers looking to get started with Vue. js API client. Makes the learning of the core framework not so easy, as it differs based on the choices taken with additional functionality. A directive has the same set of lifecycle hooks. Every Vue application starts by creating one and. As you know, Vue. Lifecycle hooks are an important part of any serious component. Coming soon in Vue 2. They let you use state and other React features without writing a class component. js for better performance 16. In this lesson, we're taking a deeper look at the Vue. Vue file that stores about the template, CSS, data-model, lifecycle hooks, mapped Vue exactions, watchers, etc. ) so do directives. Js LifeCycle Diagram | Example | Demo. Otherwise, you will have a memory leak. call ngAfterViewInit lifecycle hook for all child components/directives There are other operations that are performed during change detection and I’ve presented them all in the Everything you need to know about change detection in Angular. js instance data fields. Each step and stage is described in easy way so you can understand the execution flow of the system callback hooks. js components 11. It uses the same design as React, letting you compose a rich mobile UI using declarative components. Some users may have been wondering where the concept of "controllers" lives in the Vue. vue-typescript-component. js in a way that is design-focused. Lifecycle Hooks All lifecycle hooks have their this context bound to the ViewModel instance they belong to. js app in minutes using our Node. It works great with popular animation libraries and more tools keep getting made to make working with Vue as a frontend developer astonishing. These correspond with the different 'states' of your application. We just took a closer look at a Vue instance's lifecycle, including which hooks we have at our disposal. At these specific points in a component's life, we can use these methods to alter a component's behavior. Often the server will provide the routing, as opposed to client side routing with Vue Router. id) method from the created() vue lifecycle hook. It needs to do this because it registers a Vue mixin that subscribes to the beforeMount lifecycle hook on all components in order to be notified that renders have occurred and data is ready. Make it configurable. • Server-side coding in Node. The power of Snapshot Testing in Vue. You can hook directly into these steps. These hooks range from prior to creation with beforeCreate, to after the instance is mounted, destroyed, and many more in between. Testing Vue. Each time you add a component to an entering animation, the Animations call the following hooks: onEnter—Called before the animation starts. See also: Lifecycle Diagram. Lifecycle hooks help you tap in and perform operations at a given stage of your component life. Using the "mounted" Vue lifecycle hook, we ensure the svg-component draws for the first time when the component is mounted. 10 and below use version 2. Its task is to create a sub-class of Vue and return the constructor. First of all, let’s quickly rehearse how Vue. 0 for web development — and today we are excited to announce that Vue 2. js watcher 15. What would happen if we added a created data property, which is also the name of a lifecycle hook?. # Lifecycle Hooks So far we have covered the pure state aspect of a component: reactive state, computed state and mutating state on user input. js is a library for building interactive web interfaces. js Poster Shop. Now that we have a model of when data should be requested, let's see which lifecycle hooks are best for requesting data at those points. Scalable data visualisation with D3 and Vue Ramona Biscoveanu 11:00 - 11:30 30mins A new Router to guide your Apps. fetchTodos() ). It serves as a centralized store for all the components in an application, with rules ensuring that the state can only be mutated in a predictable fashion. Lifecycle hooks help you tap in and perform operations at a given stage of your component life. Properly Triggering Vue Component Lifecycle Hooks December 26, 2018 buzu javascript , Vue Tags: vue hooks This is something that got me scratching my head for a little while: If I have a vue component with a mounted hook, how can I trigger that hook every time the component is updated?. In this component, we are fetching asynchronous data during the component created hook. Los lifecycle hooks nos dan la capacidad para intervenir en el ciclo de vida de las instancias de Vue que están en nuestra app. Vue lifecycle flowchart Parent/Child lifecycle hooks. A lifecycle hook is a function that allows access to modify or look at state at a specific point in a components lifecycle. js Guide and then get back here to learn how to use Vue. Because Vue. Even though it was proposed by React, it's actually an important composition mechanism that has benefits across JavaScript framework ecosystems, so we'll spend a little time today discussing what this means. There are also other hooks which will be called at different stages of the instance’s lifecycle, such as mounted, updated, and destroyed. When this hook is called, all directives of the Vue instance have been unbound, all event listeners have been removed, and all child Vue instances have also been destroyed. yarn version --new-version Creates a new version specified by. It seems like yesterday we just celebrated the release of Vue 3. Another important topic to discuss in a Vue introduction is Vue's lifecycle hook. Hooks and tails pondoland square how to use ravelry pro tutorial mandala madness squared n tales crochet fynbos boho throw jen tyler allstate - eastcoastrapist. Zeolearn’s Vue. Consider the ticking clock example from one of the previous sections. It serves as a centralized store for all the components in an application, with rules ensuring that the state can only be mutated in a predictable fashion. Existem outros gatilhos (em inglês, hooks) chamados em diferentes etapas do ciclo de vida da instância, como mounted, updated e destroyed. We just took a closer look at a Vue instance's lifecycle, including which hooks we have at our disposal. Loop using v-for. • Server-side coding in Node. As you move through the book, you'll put your skills to practice by building a complete web store application with product listings, a checkout process, and an administrative interface. vue hooks 在vue 中的影响力,远远达不到react hooks 之于 react ,这也是和vue整体架构实现有关,vue hooks 给人一种反模式的错觉,甚至使用起来觉得别扭。 我认为这个feature会和vue functional components 一样,被大部分vue开发者所抛弃,render函数如果不借用jsx,书写规则. js A data stream is a sequence of ongoing events ordered in time that offer some hooks in which to observe it. It needs to do this because it registers a Vue mixin that subscribes to the beforeMount lifecycle hook on all components in order to be notified that renders have occurred and data is ready. js components have a series of lifecycles. This doesn’t mean that you need to learn React right from scratch again or rewrite your existing React applications. com/facebook/react. All lifecycle hooks are called with their this context pointing to the Vue instance invoking it. Lifecycle hooks are the defined methods which gets executed in the certain stage on the Vue object lifespan. Lifecycle Hooks. Starting this release, you can also return Promises in lifecycle hooks and event handlers, and have async errors be logged with these mechanisms. js in no time. Usage with Templates. You also notice that the lifecycle Hooks available for every Vue instance is accessible inside Vue Hooks, some of them are: useData: handles initialization of data inside your Hook, so the count is initialized inside it. js is a framework for creating Universal Vue. js would be things like button clicks, form submits, mouse over, key enter, etc. To tackle this problem you should have a good understanding of the route lifecycle and when all of the Vue and Vue Router lifecycle hooks are called. You may be able to render a Vue button inside of a jQuery DataTable, but that is because you are lucky in having the data early; i. This is where the created() function comes in. About Hook 42 We work on interesting web (Drupal, WordPress, React, Vue, Elasticsearch) projects with fun and talented people. Usually, if you have a component that is only accepting props, rendering markup and not using anything from Vue instance like life-cycle hooks, computed properties, methods, or data model, then you can provide the “functional” option and set it to true to indicate that this component should not have Vue instance. A lot of other phases are encountered in between. Not to be confused with Lifecycle Hooks, Hooks were introduced in React in v16. extend() is a class inheritance method. js is a front-end framework that builds on many of the reactive UI ideas introduced in React. Consult the Vue. A developer offers a discussion of various methods fellow web developers can use throughout the lifecycle of a Vue. # Component Lifecycle Hooks Since there are no dynamic updates, of all the lifecycle hooks, only beforeCreate and created will be called during SSR. 0 classes as Vue. Note that all lifecycle hooks in 2. Clone via HTTPS Clone with Git or checkout with SVN using the repository's web address. For 'attached' , 'detached' , 'beforeDestroy' , 'afterDestroy' , the ViewModel instance will also emit events in the form of 'hook:eventName'. Create a Vue App. js Lifecycle Hooks lesson. To have a view of all these occurrences and respond to these moments, Angular provides lifecycle hooks which give us visibility into these. The namespaces are then trivially shown as a selector through a combination of v-model, v-for and v-bind. In this article, I would like to talk about a marvelous front-end framework called Vue. x fun and easy to use. js Meetup #2 Simple Day ที่จะถึงในวันอังคารที่ 1 สิงหาคม 2560 นี้กับ concept คุยกันสบายๆ สไตล์ Vue. It’s a new way of managing state in your React components without the traditional class syntax. js for better performance 16. This listener will begin and stay running when the SisterCard. What we will do is bind to one of the lifecycle hooks for Home page component and load the data. Some users may have been wondering where the concept of "controllers" lives in the Vue. The following Vue concepts are discussed in this article: Style binding with :style (shorthand for v-bind:style) v-model directive to create two-way data bindings on form input; Computed Properties; Watched Properties; The mounted lifecycle hook. Lifecycle hooks are the defined methods which gets executed in the certain stage on the Vue object lifespan. Additionally, if any of your life cycle hooks or event handlers perform asynchronous operations, you can now return a Promise from the function. js 2 Academy: Learn Vue Step by Step [Video]. Cambridge, United Kingdom. js Lifecycle Hook Components Posted on 10 March 2019 , by Markus Oberlehner , in Development , tagged Front-End Architecture , JavaScript and Vue Note: This is the third part of my "Advanced Vue. js framework. are: beforeCreate, created, beforeMount, mounted, beforeUpdate, updated, beforeDestroy,destroyed. Lifecycle hooks are an important part of any serious component. As written above, mindset about hooks is different than in classes, and that’s why there are no lifecycle methods at all, and one should not look at Hooks in that way. Depending on the type of fish you want to catch the size and strength will vary. The lifecycle hooks receive a Vuex store for their first argument. Vue 3, currently in the prototyping phase is planning to move to TypeScript. js applications often come from using third-party libraries that create their own instances and/or manipulate the DOM. It is in this hook that I would go about doing anything that I might want to happen before the data object is created in the created hook, and it is also the very first hook that fires in the. Lets see these hooks in action. component() method. The fact-checkers, whose work is more and more important for those who prefer facts over lies, police the line between fact and falsehood on a day-to-day basis, and do a great job. Today, my small contribution is to pass along a very good overview that reflects on one of Trump’s favorite overarching falsehoods. Namely: Trump describes an America in which everything was going down the tubes under  Obama, which is why we needed Trump to make America great again. And he claims that this project has come to fruition, with America setting records for prosperity under his leadership and guidance. “Obama bad; Trump good” is pretty much his analysis in all areas and measurement of U.S. activity, especially economically. Even if this were true, it would reflect poorly on Trump’s character, but it has the added problem of being false, a big lie made up of many small ones. Personally, I don’t assume that all economic measurements directly reflect the leadership of whoever occupies the Oval Office, nor am I smart enough to figure out what causes what in the economy. But the idea that presidents get the credit or the blame for the economy during their tenure is a political fact of life. Trump, in his adorable, immodest mendacity, not only claims credit for everything good that happens in the economy, but tells people, literally and specifically, that they have to vote for him even if they hate him, because without his guidance, their 401(k) accounts “will go down the tubes.” That would be offensive even if it were true, but it is utterly false. The stock market has been on a 10-year run of steady gains that began in 2009, the year Barack Obama was inaugurated. But why would anyone care about that? It’s only an unarguable, stubborn fact. Still, speaking of facts, there are so many measurements and indicators of how the economy is doing, that those not committed to an honest investigation can find evidence for whatever they want to believe. Trump and his most committed followers want to believe that everything was terrible under Barack Obama and great under Trump. That’s baloney. Anyone who believes that believes something false. And a series of charts and graphs published Monday in the Washington Post and explained by Economics Correspondent Heather Long provides the data that tells the tale. The details are complicated. Click through to the link above and you’ll learn much. But the overview is pretty simply this: The U.S. economy had a major meltdown in the last year of the George W. Bush presidency. Again, I’m not smart enough to know how much of this was Bush’s “fault.” But he had been in office for six years when the trouble started. So, if it’s ever reasonable to hold a president accountable for the performance of the economy, the timeline is bad for Bush. GDP growth went negative. Job growth fell sharply and then went negative. Median household income shrank. The Dow Jones Industrial Average dropped by more than 5,000 points! U.S. manufacturing output plunged, as did average home values, as did average hourly wages, as did measures of consumer confidence and most other indicators of economic health. (Backup for that is contained in the Post piece I linked to above.) Barack Obama inherited that mess of falling numbers, which continued during his first year in office, 2009, as he put in place policies designed to turn it around. By 2010, Obama’s second year, pretty much all of the negative numbers had turned positive. By the time Obama was up for reelection in 2012, all of them were headed in the right direction, which is certainly among the reasons voters gave him a second term by a solid (not landslide) margin. Basically, all of those good numbers continued throughout the second Obama term. The U.S. GDP, probably the single best measure of how the economy is doing, grew by 2.9 percent in 2015, which was Obama’s seventh year in office and was the best GDP growth number since before the crash of the late Bush years. GDP growth slowed to 1.6 percent in 2016, which may have been among the indicators that supported Trump’s campaign-year argument that everything was going to hell and only he could fix it. During the first year of Trump, GDP growth grew to 2.4 percent, which is decent but not great and anyway, a reasonable person would acknowledge that — to the degree that economic performance is to the credit or blame of the president — the performance in the first year of a new president is a mixture of the old and new policies. In Trump’s second year, 2018, the GDP grew 2.9 percent, equaling Obama’s best year, and so far in 2019, the growth rate has fallen to 2.1 percent, a mediocre number and a decline for which Trump presumably accepts no responsibility and blames either Nancy Pelosi, Ilhan Omar or, if he can swing it, Barack Obama. I suppose it’s natural for a president to want to take credit for everything good that happens on his (or someday her) watch, but not the blame for anything bad. Trump is more blatant about this than most. If we judge by his bad but remarkably steady approval ratings (today, according to the average maintained by 538.com, it’s 41.9 approval/ 53.7 disapproval) the pretty-good economy is not winning him new supporters, nor is his constant exaggeration of his accomplishments costing him many old ones). I already offered it above, but the full Washington Post workup of these numbers, and commentary/explanation by economics correspondent Heather Long, are here. On a related matter, if you care about what used to be called fiscal conservatism, which is the belief that federal debt and deficit matter, here’s a New York Times analysis, based on Congressional Budget Office data, suggesting that the annual budget deficit (that’s the amount the government borrows every year reflecting that amount by which federal spending exceeds revenues) which fell steadily during the Obama years, from a peak of $1.4 trillion at the beginning of the Obama administration, to $585 billion in 2016 (Obama’s last year in office), will be back up to $960 billion this fiscal year, and back over $1 trillion in 2020. (Here’s the New York Times piece detailing those numbers.) Trump is currently floating various tax cuts for the rich and the poor that will presumably worsen those projections, if passed. As the Times piece reported: