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<meta content="One-page guide to Vue.js: usage, examples, and more. Vue.js is an open-source Modelviewviewmodel JavaScript framework for building user interfaces and single-page applications." name="description">
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<h1 class='h1'>Vue.js <em>cheatsheet</em></h1>
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<p><a href="https://vuejs.org/">Vue.js</a> is an open-source Modelviewviewmodel JavaScript framework for building user interfaces and single-page applications.</p>
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<main class='post-content MarkdownBody' data-js-main-body data-js-anchors role='main'>
<h2 class="-three-column" id="expressions">Expressions</h2>
<h3 id="expressions-1">Expressions</h3>
<pre><code class="language-html">&lt;div id="app"&gt;
&lt;p&gt;I have a {{ product }}&lt;/p&gt;
&lt;p&gt;{{ product + 's' }}&lt;/p&gt;
&lt;p&gt;{{ isWorking ? 'YES' : 'NO' }}&lt;/p&gt;
&lt;p&gt;{{ product.getSalePrice() }}&lt;/p&gt;
&lt;/div&gt;
</code></pre>
<p>See: <a href="https://vuejs.org/v2/api/#delimiters">Delimiters</a></p>
<h3 id="binding">Binding</h3>
<pre><code class="language-html">&lt;a v-bind:href="url"&gt;...&lt;/a&gt;
</code></pre>
<h4 id="shorthand-syntax">Shorthand syntax</h4>
<pre data-line="1"><code class="language-html">&lt;a :href="url"&gt;...&lt;/a&gt;
</code></pre>
<h4 id="true-or-false-will-add-or-remove-attribute">True or false will add or remove attribute</h4>
<pre><code class="language-html">&lt;button :disabled="isButtonDisabled"&gt;...
</code></pre>
<h4 id="if-isactive-is-truthy-the-class-active-will-appear">If isActive is truthy, the class active will appear</h4>
<pre><code class="language-html">&lt;div :class="{ active: isActive }"&gt;...
</code></pre>
<h4 id="style-color-set-to-value-of-activecolor">Style color set to value of activeColor</h4>
<pre><code class="language-html">&lt;div :style="{ color: activeColor }"&gt;
</code></pre>
<p>See: <a href="https://vuejs.org/v2/api/#v-bind">v-bind</a></p>
<h3 id="directives">Directives</h3>
<h4 id="element-insertedremoved-based-on-truthiness">Element inserted/removed based on truthiness</h4>
<pre><code class="language-html">&lt;p v-if="inStock"&gt;{{ product }}&lt;/p&gt;
</code></pre>
<pre><code class="language-html">&lt;p v-else-if="onSale"&gt;...&lt;/p&gt;
&lt;p v-else&gt;...&lt;/p&gt;
</code></pre>
<h4 id="toggles-the-display-none-css-property">Toggles the display: none CSS property</h4>
<pre><code class="language-html">&lt;p v-show="showProductDetails"&gt;...&lt;/p&gt;
</code></pre>
<h4 id="two-way-data-binding">Two-way data binding</h4>
<pre><code class="language-html">&lt;input v-model="firstName" &gt;
</code></pre>
<table>
<thead>
<tr>
<th>Method</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>v-model.lazy="..."</code></td>
<td>Syncs input after change event</td>
</tr>
<tr>
<td><code>v-model.number="..."</code></td>
<td>Always returns a number</td>
</tr>
<tr>
<td><code>v-model.trim="..."</code></td>
<td>Strips whitespace</td>
</tr>
</tbody>
</table>
<p>See: <a href="https://vuejs.org/v2/api/#Directives">Directives</a></p>
<h3 id="actionsevents">Actions/Events</h3>
<h4 id="calls-addtocart-method-on-component">Calls addToCart method on component</h4>
<pre><code class="language-html">&lt;button v-on:click="addToCart"&gt;...
</code></pre>
<h4 id="shorthand-syntax-1">Shorthand syntax</h4>
<pre data-line="1"><code class="language-html">&lt;button @click="addToCart"&gt;...
</code></pre>
<h4 id="arguments-can-be-passed">Arguments can be passed</h4>
<pre><code class="language-html">&lt;button @click="addToCart(product)"&gt;...
}
</code></pre>
<h4 id="to-prevent-default-behavior-eg-page-reload">To prevent default behavior (e.g. page reload)</h4>
<pre><code class="language-html">&lt;form @submit.prevent="addProduct"&gt;...
</code></pre>
<h4 id="only-trigger-once">Only trigger once</h4>
<pre><code class="language-html">&lt;img @mouseover.once="showImage"&gt;...
</code></pre>
<table>
<thead>
<tr>
<th>Method</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>.stop</code></td>
<td>Stop all event propagation</td>
</tr>
<tr>
<td><code>.self </code></td>
<td>Only trigger if event.target is element itself</td>
</tr>
</tbody>
</table>
<h4 id="keyboard-entry-example">Keyboard entry example</h4>
<pre><code class="language-html">&lt;input @keyup.enter="submit"&gt;
</code></pre>
<h4 id="call-oncopy-when-control-c-is-pressed">Call onCopy when control-c is pressed</h4>
<pre><code class="language-html">&lt;input @keyup.ctrl.c="onCopy"&gt;
</code></pre>
<p>See: <a href="https://vuejs.org/v2/guide/events.html">Events</a></p>
<h3 id="list-rendering">List rendering</h3>
<h4 id="the-key-is-always-recommended">The <code>:key</code> is always recommended</h4>
<pre data-line="2"><code class="language-html">&lt;li v-for="item in items"
:key="item.id"&gt;
{{ item }}
&lt;/li&gt;
</code></pre>
<h4 id="to-access-the-position-in-the-array">To access the position in the array</h4>
<pre><code class="language-html">&lt;li v-for="(item, index) in items"&gt;...
</code></pre>
<h4 id="to-iterate-through-objects">To iterate through objects</h4>
<pre><code class="language-html">&lt;li v-for="(value, key) in object"&gt;...
</code></pre>
<h4 id="using-v-for-with-a-component">Using <code>v-for</code> with a component</h4>
<pre><code class="language-html">&lt;cart-product v-for="item in products"
:product="item"
:key="item.id"&gt;
</code></pre>
<p>See: <a href="https://vuejs.org/v2/guide/list.html">List Rendering</a></p>
<h2 id="component">Component</h2>
<h3 id="component-anatomy">Component anatomy</h3>
<pre data-line="3, 8, 16, 21, 28, 34, 39"><code class="language-js">Vue.component('my-component', {
components: {
// Components that can be used in the template
ProductComponent,
ReviewComponent
},
props: {
// The parameters the component accepts
message: String,
product: Object,
email: {
type: String,
required: true,
default: "none"
validator: function (value) {
// Should return true if value is valid
}
}
},
data: function() {
// `data` must be a function
return {
firstName: 'Vue',
lastName: 'Mastery'
}
},
computed: {
// Return cached values until dependencies change
fullName: function () {
return this.firstName + ' ' + this.lastName
}
},
watch: {
// Called when firstName changes value
firstName: function (value, oldValue) { ... }
},
methods: { ... },
template: '&lt;span&gt;{{ message }}&lt;/span&gt;',
// Can also use backticks in `template` for multi-line
})
</code></pre>
<p>See: <a href="https://vuejs.org/v2/guide/components.html">Components Basics</a></p>
<h3 id="lifecycle-hooks">Lifecycle hooks</h3>
<table>
<thead>
<tr>
<th>Method</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>beforeCreate</code></td>
<td>After the instance has been initialized <a href="https://vuejs.org/v2/api/#beforeCreate">#</a></td>
</tr>
<tr>
<td><code>created</code></td>
<td>After the instance is created <a href="https://vuejs.org/v2/api/#created">#</a></td>
</tr>
<tr>
<td><code>beforeMount</code></td>
<td>Before the first render <a href="https://vuejs.org/v2/api/#beforeMount">#</a></td>
</tr>
<tr>
<td><code>mounted</code></td>
<td>After the instance has been mounted <a href="https://vuejs.org/v2/api/#mounted">#</a></td>
</tr>
<tr>
<td><code>beforeUpdate</code></td>
<td>When data changes, before the DOM is patched <a href="https://vuejs.org/v2/api/#beforeUpdate">#</a></td>
</tr>
<tr>
<td><code>updated</code></td>
<td>After a data change <a href="https://vuejs.org/v2/api/#updated">#</a></td>
</tr>
<tr>
<td><code>beforeDestroy</code></td>
<td>Before the instance is destroyed <a href="https://vuejs.org/v2/api/#beforeDestroy">#</a></td>
</tr>
<tr>
<td><code>destroyed</code></td>
<td>After a Vue instance has been destroyed <a href="https://vuejs.org/v2/api/#destroyed">#</a></td>
</tr>
</tbody>
</table>
<p>See: <a href="https://vuejs.org/v2/api/#Options-Lifecycle-Hooks">Lifecycle Hooks</a></p>
<h3 id="custom-events">Custom events</h3>
<h4 id="set-listener-on-component-within-its-parent">Set listener on component, within its parent</h4>
<pre><code class="language-html">&lt;button-counter v-on:incrementBy="incWithVal"&gt;
</code></pre>
<h4 id="inside-parent-component">Inside parent component</h4>
<pre><code class="language-js">methods: {
incWithVal: function (toAdd) { ... }
}
</code></pre>
<h4 id="inside-button-counter-template">Inside button-counter template</h4>
<pre><code class="language-js">this.$emit(
'incrementBy', // Custom event name
5 // Data sent up to parent
)
</code></pre>
<p>Use props to pass data into child components,
custom events to pass data to parent elements.</p>
<p>See: <a href="https://vuejs.org/v2/guide/components-custom-events.html">Custom Events</a></p>
<h2 id="single-file-components">Single file components</h2>
<h3 id="single-file">Single file</h3>
<pre><code class="language-html">&lt;template&gt;
&lt;p&gt;{{ greeting }} World!&lt;/p&gt;
&lt;/template&gt;
&lt;script&gt;
module.exports = {
data: function () {
return {
greeting: 'Hello'
}
}
}
&lt;/script&gt;
&lt;style scoped&gt;
p {
font-size: 2em;
text-align: center;
}
&lt;/style&gt;
</code></pre>
<p>See: <a href="https://vuejs.org/v2/guide/single-file-components.html">Single File Components</a></p>
<h3 id="separation">Separation</h3>
<pre><code class="language-html">&lt;template&gt;
&lt;div&gt;This will be pre-compiled&lt;/div&gt;
&lt;/template&gt;
&lt;script src="./my-component.js"&gt;&lt;/script&gt;
&lt;style src="./my-component.css"&gt;&lt;/style&gt;
</code></pre>
<p>See: <a href="https://vuejs.org/v2/guide/single-file-components.html#What-About-Separation-of-Concerns">What About Separation of Concerns?</a></p>
<h2 id="slots">Slots</h2>
<h3 id="using-a-single-slot">Using a single slot</h3>
<h4 id="component-template">Component template</h4>
<pre data-line="3,4,5"><code class="language-html">&lt;div&gt;
&lt;h2&gt;I'm a title&lt;/h2&gt;
&lt;slot&gt;
Only displayed if no slot content
&lt;/slot&gt;
&lt;/div&gt;
</code></pre>
<h4 id="use-of-component-with-data-for-slot">Use of component with data for slot</h4>
<pre data-line="2"><code class="language-html">&lt;my-component&gt;
&lt;p&gt;This will go in the slot&lt;/p&gt;
&lt;/my-component&gt;
</code></pre>
<p>See: <a href="https://vuejs.org/v2/guide/components-slots.html">Slots</a></p>
<h3 id="multiple-slots">Multiple slots</h3>
<h4 id="component-template-1">Component template</h4>
<pre data-line="3,6,9"><code class="language-html">&lt;div class="container"&gt;
&lt;header&gt;
&lt;slot name="header"&gt;&lt;/slot&gt;
&lt;/header&gt;
&lt;main&gt;
&lt;slot&gt;Default content&lt;/slot&gt;
&lt;/main&gt;
&lt;footer&gt;
&lt;slot name="footer"&gt;&lt;/slot&gt;
&lt;/footer&gt;
&lt;/div&gt;
</code></pre>
<h4 id="use-of-component-with-data-for-slots">Use of component with data for slots</h4>
<pre data-line="2,3,4"><code class="language-html">&lt;app-layout&gt;
&lt;h1 slot="header"&gt;Page title&lt;/h1&gt;
&lt;p&gt;the main content.&lt;/p&gt;
&lt;p slot="footer"&gt;Contact info&lt;/p&gt;
&lt;/app-layout&gt;
</code></pre>
<p>See: <a href="https://vuejs.org/v2/guide/components-slots.html">Slots</a></p>
<h2 id="also-see">Also see</h2>
<ul>
<li><a href="https://cli.vuejs.org/">Vue CLI</a> <em>(cli.vuejs.org)</em></li>
<li><a href="https://router.vuejs.org/">Vue Router</a> <em>(router.vuejs.org)</em></li>
<li><a href="https://chrome.google.com/webstore/detail/vuejs-devtools/nhdogjmejiglipccpnnnanhbledajbpd?hl=en">Vue DevTools</a> <em>(chrome.google.com)</em></li>
<li><a href="https://nuxtjs.org/">Nuxt.js</a> <em>(nuxtjs.org)</em></li>
<li><a href="vue@1.0.28/">Vue.js v1.0.28 cheatsheet</a> <em>Legacy version</em></li>
</ul>
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