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form.html
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<!DOCTYPE html>
<html lang="zh-TW">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Form Input Bindings</title>
<link rel="stylesheet" href="./style.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/obsidian.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js"></script>
<script>hljs.initHighlightingOnLoad();</script>
</head>
<body>
<h1>Form Input Bindings</h1>
<h2>Basic Usage</h2>
<div id="vmode-basic">
<p class="tip">主要是要介紹<code>v-model</code>，不過他也只是語法糖。</p>
<p>有一些地雷要注意</p>
<ol>
<li>會忽略所有表單元素的value、checked、selected1特性的初始值。<br /> 會選擇Vue實例數據來作為具體的值。
<br /> 必須在Vuejs的data裡，宣告初始值。(超重要!!!)
</li>
<li>對於要求IME (如中文、日語、韓語等) (IME意為'輸入法')的語言，你會發現<code>v-model</code>不會在ime輸入中得到更新。<br />如果你也想實現更新，請使用input事件。</li>
</ol>
<h3>Text</h3>
<b>HTML</b>
<pre><code class="html">< input v-model="message" placeholder="edit me" >
< p >Message is: { { message } }< /p ></code></pre>
<b>Javascript</b>
<pre><code class="javascript">data: {
message: '{{ message }}'
}</code></pre>
<b>Result</b>
<input v-model="message" placeholder="edit me">
<p>Message is: {{ message }}</p>
<h3>Multiline text</h3>
<b>HTML</b>
<pre><code class="html">< span >Multiline message is:< /span >
< p style="white-space: pre-line" >{ { message } }< /p >
< br >
< textarea v-model="message" placeholder="add multiple lines" >< /textarea ></code></pre>
<p>在<code>< textarea >< /textarea ></code>插值並不會動作，必須加<code>v-model</code>。</p>
<b>Javascript</b>
<pre><code class="javascript">data: {
message: '{{ message }}'
}</code></pre>
<b>Result</b>
<br>
<span>Multiline message is:</span>
<p style="white-space: pre-line">{{ message }}</p>
<textarea v-model="message" placeholder="add multiple lines"></textarea>
<h3>Checkbox</h3>
<p>當作開關: true | false</p>
<b>HTML</b>
<pre><code class="html">< input type="checkbox" id="checkbox" v-model="checked" >
< label for="checkbox" >{ { checked } }< /label ></code></pre>
<b>Javascript</b>
<pre><code class="javascript">data: {
checked: {{ checked }}
}</code></pre>
<b>Result</b><br />
<input type="checkbox" id="checkbox" v-model="checked">
<label for="checkbox">{{ checked }}</label>
<p>當作多選: 成為新陣列</p>
<b>HTML</b>
<pre><code class="html">< div id='example-3' >
< input type="checkbox" id="jack" value="Jack" v-model="checkedNames" >
< label for="jack" >Jack< /label >
< input type="checkbox" id="john" value="John" v-model="checkedNames" >
< label for="john" >John< /label >
< input type="checkbox" id="mike" value="Mike" v-model="checkedNames" >
< label for="mike" >Mike< /label >
< br >
< span >Checked names: { { checkedNames } }< /span >
< div ></code></pre>
<b>Javascript</b>
<pre><code class="javascript">data: {
checkedNames: {{ checkedNames }}
}</code></pre>
<b>Result</b>
<!-- <div id='example-3'> -->
<input type="checkbox" id="jack" value="Jack" v-model="checkedNames">
<label for="jack">Jack</label>
<input type="checkbox" id="john" value="John" v-model="checkedNames">
<label for="john">John</label>
<input type="checkbox" id="mike" value="Mike" v-model="checkedNames">
<label for="mike">Mike</label>
<br>
<span>Checked names: {{ checkedNames }}</span>
<!-- <div> -->
<h3>Radio</h3>
<b>HTML</b>
<pre><code class="html">< input type="radio" id="one" value="One" v-model="picked" >
< label for="one" >One< /label >
< br >
< input type="radio" id="two" value="Two" v-model="picked" >
< label for="two" >Two< /label >
< br >
< span >Picked: { { picked } }< /span ></code></pre>
<b>Javascript</b>
<pre><code class="javascript">data: {
picked: '{{ picked }}'
}</code></pre>
<b>Result</b><br />
<input type="radio" id="one" value="One" v-model="picked">
<label for="one">One</label>
<br>
<input type="radio" id="two" value="Two" v-model="picked">
<label for="two">Two</label>
<br>
<span>Picked: {{ picked }}</span>
<h3>Select</h3>
<b>HTML</b>
<pre><code class="html">< select v-model="selected1" >
< option disabled value="" >Please select one< /option >
< option >A< /option >
< option >B< /option >
< option >C< /option >
< /select >
< span >Selected: { { selected1 } }< /span ></code></pre>
<p class="tip">如果 <code>v-model</code> 的初始值沒有任何匹配的選項，
< select>元素就會以「未選擇」的狀態渲染。<br /> 在iOS中，這樣使用者將無法選擇第一個選項，因為這樣的情況下，iOS不會引發change事件。
<br /> 因此，像以上提供 <code>disabled</code> 選項是建議的做法。</p>
<b>Javascript</b>
<pre><code class="javascript">data: {
selected1: '{{ selected1 }}'
}</code></pre>
<b>Result</b><br />
<select v-model="selected1">
<option disabled value="">Please select one</option>
<option>A</option>
<option>B</option>
<option>C</option>
</select>
<span>Selected: {{ selected1 }}</span>
<p><b>複選選單</b></p>
<b>HTML</b>
<pre><code class="html">< select v-model="selected2" multiple >
< option >A< /option >
< option >B< /option >
< option >C< /option >
< /select >
< br >
< span >Selected: { { selected2 } }< /span ></code></pre>
<b>Javascript</b>
<pre><code class="javascript">data: {
selected2: '{{ selected2 }}'
}</code></pre>
<b>Result</b><br />
<select v-model="selected2" multiple>
<option>A</option>
<option>B</option>
<option>C</option>
</select>
<br>
<span>Selected: {{ selected2 }}</span>
<p><b>Key-value的選項</b></p>
<b>HTML</b>
<pre><code class="html">< select v-model="selected1" >
< option v-for="option in options" v-bind:value="option.value" >
{ { option.text } }
< /option >
< /select >
< span >Selected: { { selected1 } }< /span ></code></pre>
<b>Javascript</b>
<pre><code class="javascript">data: {
selected1: '{{ selected1 }}',
options: [
{ text: 'One', value: 'A' },
{ text: 'Two', value: 'B' },
{ text: 'Three', value: 'C' }
]
}</code></pre>
<b>Result</b><br />
<select v-model="selected1">
<option v-for="option in options" v-bind:value="option.value">
{{ option.text }}
</option>
</select>
<span>Selected: {{ selected1 }}</span>
</div>
<h2>Value Bindings</h2>
<p>可以看成一種使用者可以操作的<code>if</code>判斷式</p>
<p><code>type=radio</code>, <code>checkbox</code>的<code>input</code>，還有<code>select</code>的<code>option</code><br /> 它們的值都是static string。選上了就將<code>html</code>裡的值，賦值到<code>Javascrit</code></p>
<div id="vmode-value-bindings">
<b>HTML</b>
<pre><code class="html">< !-- `picked` is a string "a" when checked -- >
< input type="radio" v-model="picked" value="a" >
< !-- `toggle` is either true or false -- >
< input type="checkbox" v-model="toggle" >
< !-- `selected1` is a string "abc" when selected1 -- >
< select v-model="selected1" >
< option value="abc" >ABC< /option >
< /select ></code></pre>
<b>Result</b>
<!-- `picked` is a string "a" when checked -->
<input type="radio" v-model="picked" value="a">
<label>{{picked}}</label>
<!-- `toggle` is either true or false -->
<input type="checkbox" v-model="toggle">
<label>{{toggle}}</label>
<!-- `selected1` is a string "abc" when selected1 -->
<select v-model="selected1"><option value="abc">ABC</option></select>
<label>{{selected1}}</label>
<h3>Checkbox</h3>
<b>HTML</b>
<pre><code class="html">< input
type="checkbox"
v-model="toggle"
v-bind:true-value="a"
v-bind:false-value="b" ></code></pre>
<p>// when checked:<br /> vm.toggle === vm.a<br /> // when unchecked:<br /> vm.toggle === vm.b
</p>
<b>Javascript</b>
<pre><code class="javascript">data: {
toggle: {{toggle}},
a: {{a}}, //static string
b: {{b}} //static string
}</code></pre>
<b>Result</b><br />
<input type="checkbox" v-model="toggle" v-bind:true-value="a" v-bind:false-value="b">
<h3>Radio</h3>
<b>HTML</b>
<pre><code class="html">< input type="radio" v-model="picked" v-bind:value="c" ></code></pre>
<p>// when checked: vm.picked === vm.c</p>
<b>Javascript</b>
<pre><code class="javascript">data: {
picked: '{{picked}}',
c: '{{c}}', //static string
d: '{{d}}' //static string
}</code></pre>
<b>Result</b><br />
<input type="radio" v-model="picked" v-bind:value="c">
<input type="radio" v-model="picked" v-bind:value="d">
<h3>Select Options</h3>
<b>HTML</b>
<pre><code class="html">< select v-model="selected2" >
< !-- inline object literal -- >
< option v-bind:value="{ number: 123 }" >123< /option >
< /select ></code></pre>
<p>// when selected2:<br /> typeof vm.selected2 // => 'object'<br /> vm.selected2.number // => 123</p>
<b>Javascript</b>
<pre><code class="javascript">data: {
selected2: {{selected2}}
}</code></pre>
<b>Result</b>
<select v-model="selected2">
<!-- inline object literal -->
<option v-bind:value="{ number: 111 }">111</option>
<option v-bind:value="{ number: 222 }">222</option>
<option v-bind:value="{ number: 333 }">333</option>
<option v-bind:value="{ number: 123 }">123</option>
</select>
<h2>Modifiers</h2>
<h3><code>.lazy</code></h3>
<p>讓修改值的行為，在失去<code>focus</code>時執行，而不是像一般的情況在<code>change</code>時執行。</p>
<b>HTML</b>
<pre><code class="html">< !-- synced after "change" instead of "input" -->
< input v-model.lazy="msg" ></code></pre>
<b>Javascript</b>
<pre><code class="javascript">data: {
msg: '{{msg}}'
}</code></pre>
<b>Result</b><br />
<!-- synced after "change" instead of "input" -->
有加<code>lazy</code><input v-model.lazy="msg"><br /> 沒加
<code>lazy</code><input v-model="msg">
<h3><code>.number</code></h3>
<p>轉態成數字的變數型態</p>
<b>HTML</b>
<pre><code class="html">< input v-model.number="age" type="number" ></code></pre>
<b>Javascript</b>
<pre><code class="javascript">data: {
age: {{age}} //is a {{typeof(age)}}
}</code></pre>
<b>Result</b><br /> 有加
<code>number</code><input v-model.number="age" type="number"><br /> 沒加
<code>number</code><input v-model="age" type="number">
<h3><code>.trim</code></h3>
<b>HTML</b>
<pre><code class="html">< input v-model.trim="msg" ></code></pre>
<b>Javascript</b>
<pre><code class="javascript">data: {
msg: '{{msg}}'
}</code></pre>
<b>Result</b><br /> 有加
<code>trim</code><input v-model.trim="msg"><br /> 沒加
<code>trim</code><input v-model="msg">
<h2><code>v-model</code> with Components</h2>
<p>直接看<a href="https://vuefe.cn/v2/guide/components.html#自定义事件">組件的自定義事件</a></p>
</div>
<script src="https://unpkg.com/vue"></script>
<script type="text/javascript">
var vmode_basic = new Vue ({
el: '#vmode-basic',
data: {
message: 'this is message',
checked: false,
checkedNames: [],
picked: '',
selected1: '',
selected2: [],
options: [
{ text: 'One', value: 'A' },
{ text: 'Two', value: 'B' },
{ text: 'Three', value: 'C' }
]
}
})
var vmode_value_bindings = new Vue ({
el: '#vmode-value-bindings',
data: {
toggle: true,
a: true,
b: false,
picked: 'c',
c: 'c',
d: 'd',
selected1: 'qwer',
selected2: {number: 123},
msg: 'msg',
age: 0
}
})
</script>
</body>
</html>