Fix typo, language, and add some more info (#28359)
Fix typo, language, and add some more info
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@ -2,7 +2,7 @@
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title: Declarative Rendering
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---
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## Instalation
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## Installation
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Before we get started, there are a couple of ways to use Vue.js, namely via CDN and via
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installation. For a first experience, it's easier to use the CDN.
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@ -25,16 +25,13 @@ recommended for beginners.
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## Declarative Rendering
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Vue.js is a great tool for creating dynamic pages, and a first way to get in
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touch with that is what's called Declarative Rendering.
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touch with that is what's called *Declarative Rendering*.
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The use of term "declarative" tends to straighten this concept to
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declarative languages, such as SQL: you order something, it's not implied
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any implementation. Vue.js allows you to declare what data you want to be
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rendered, as simply as that:
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"Declarative", because it is somewhat similar to declarative languages such as SQL. Using Vue.js straightforward syntax, you just *declare* what data you want to see, and the framework will take care of the rendering, as simply as that:
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```html
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<div id="app">
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{{ message }}
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{{ message }} <!-- declaring what we want to see -->
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</div>
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```
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@ -42,23 +39,24 @@ rendered, as simply as that:
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let app = new Vue({
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el: '#app',
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data: {
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message: 'Hello, world!'
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message: 'Hello, world!' // Vue.js fetches its value here
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}
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});
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```
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With those snippets, you're telling Vue to dynamically render whatever is stored
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inside `message` variable. And the fun: whenever `message` is changed,
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Vue.js manages to reload that specific part of the DOM and you see the
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change.
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With those snipets, you're telling Vue to dynamically render whatever is stored
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inside the `message` variable. And the fun part: whenever `message` is changed,
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Vue.js manages to instantly update that specific part of the DOM.
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If you want to try this reactivity out, open the console and change the value
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of `app.message` to, say, `"Hello from console"`. Did you notice the change in
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the page?
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To experience this reactivity, once you've set up a new project and displayed it in your browser open the console and change the value of app.message to, say, "Hello from console".
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The `{{ ... }}` is the syntax for that behavior: outputting the value
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`app.message = "Hello from console"`
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Did you notice the change in the page? It's just like magic.
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The `{{ ... }}`, or double mustache brakets, is the syntax for that behavior: outputting the value
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of a variable or of an expression. For instance, this is also a valid use and
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will result in `hello`:
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will result in `hello` :
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```html
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<div id="app">
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@ -66,9 +64,8 @@ will result in `hello`:
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</div>
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```
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There are cases in which what we want is to set an attribute using our Vue app's
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variable. You might think that the same syntax applies, but Vue has something
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specific for that, what we call "binding".
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There will be cases when we want to dynamically set a DOM element's attribute.
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Vue has a way to do exactly that, and it is called "binding" :
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```html
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<div id="app">
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@ -85,6 +82,8 @@ let app = new Vue({
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}
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```
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The syntax `v-bind` is what Vue.js calls a "directive". It's a way to set a new
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attribute to the tag that will be handled by Vue -- there are more
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directives, they all begin with `v-`.
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The `v-bind:` syntax is what Vue.js calls a "directive". It's a way to dynamically bind an attribute to data.
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As a shorthand, `v-bind:` can be replaced with `:`. You will often see it used that way, as this type of directive is widely used across projects. See more shorthands in the shorthand section of this Vue.js guide.
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As a general rule, Vue.js makes it easy to recognize its declarations by always using the `v-` prefix :
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`v-bind`, `v-for`, `v-if`, `v-else`, `v-on`, and more.
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