Detailed explanation of the steps to operate form controls with Vue.js

This time I will bring you a detailed explanation of the steps to operate the form control with Vue.js. What are the precautions for operating the form control with Vue.js? The following is a practical case, let's take a look.

Concept Description

v-model directive: Creates a two-way data binding on a form control element. v-model will automatically choose the correct method to update the element based on the control type.

Input box

The example demonstrates the use of v-model in the input and textarea elements to achieve bidirectionality Data binding:

HTML

nbsp;html>


<meta>
<title>Vue 测试实例</title>
<script></script>


<p>
 </p><p>input 元素：</p>
 <input>
 <p>消息是: {{ message }}</p>
 <p>textarea 元素：</p>
 <p>{{ message2 }}</p>
 <textarea></textarea>

<script>
new Vue({
 el: &#39;#app&#39;,
 data: {
 message: &#39;Runoob&#39;,
 message2: &#39;菜鸟教程\r\nhttp://www.runoob.com&#39;
 }
})
</script>

##Checkbox

If the check box is a single one, it is a logical value. If there are multiple check boxes, it is bound to the same array:

HTML

nbsp;html>


<meta>
<title>Vue 测试实例 </title>
<script></script>


<p>
 </p><p>单个复选框：</p>
 <input>
 <label>{{ checked }}</label>
 <p>多个复选框：</p>
 <input>
 <label>Runoob</label>
 <input>
 <label>Google</label>
 <input>
 <label>taobao</label>
 <br>
 <span>选择的值为: {{ checkedNames }}</span>

<script>
new Vue({
 el: &#39;#app&#39;,
 data: {
 checked : false,
 checkedNames: []
 }
})
</script>

Radio button

##HTML

nbsp;html>


<meta>
<title>Vue 测试实例 </title>
<script></script>


<p>
 <input>
 <label>Runoob</label>
 <br>
 <input>
 <label>Google</label>
 <br>
 <span>选中值为: {{ picked }}</span>
</p>
<script>
new Vue({
 el: &#39;#app&#39;,
 data: {
 picked : &#39;Runoob&#39;
 }
})
</script>

Drop-down list

HTML

nbsp;html>


<meta>
<title>Vue 测试实例</title>
<script></script>


<p>
 <select>
 <option>选择一个网站</option>
 <option>Runoob</option>
 <option>Google</option>
 </select>
 </p><p>
 选择的网站是: {{selected}}
 </p>

<script> new Vue({ el: &#39;#app&#39;, data: { selected: &#39;&#39; } }) </script>

##Modifier

.lazy

By default, v-model synchronizes the value and data of the input box in the input event, but you can add a modifier lazy to switch to synchronization in the change event:

<!-- 在 "change" 而不是 "input" 事件中更新 -->
<input>

.number

If you want to automatically convert the user's input value to the Number type (if the conversion result of the original value is NaN, the original value will be returned), you can add a modifier number to v-model for processing Input value:

<input>

This is often useful because the value entered in HTML will always be returned as a string when type="number".

.trim

If you want to
automatically filter

the first and last spaces entered by the user, you can add the trim modifier to v-model to filter the input:

<input>

I believe I read it You have mastered the method in the case of this article. For more exciting information, please pay attention to other related articles on the php Chinese website! Recommended reading:

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