Example analysis of change() usage in jquery

Example analysis of change() usage in jquery_jquery

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Release： 2016-05-16 16:15:31

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This article analyzes the usage of change() in jquery with examples. Share it with everyone for your reference. The specific analysis is as follows:

change() When the value of an element changes, the change event occurs. This event only applies to text fields, and textarea and select elements.
When used on a select element, the change event occurs when an option is selected. When used with a text field or text area, this event occurs when the element loses focus.

1. How to use change

1. Trigger change event: Trigger change event of selected element

Syntax: $(selector).change()

2. Bind the function to the change event: Specify the function to be run when the change event of the selected element occurs.

Syntax: $(selector).change(function)

2. Example of change() in jquery

<html>
<head>
<script type="text/javascript" src="jquery文件"></script>
<script type="text/javascript">
$(document).ready(function(){
 $(".field").change(function(){
  $(this).css("background-color","#FFFFCC");
 });
 $("button").click(function(){
  $("input").change();
 });
});
</script>
</head>
<body>
<button>激活文本域的 change 事件</button>
<p>Enter your name: <input class="field" type="text" /></p>
</body>
</html>

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<html>
<head>
<script type="text/javascript" src="jquery文件"></script>
<script type="text/javascript">
$(document).ready(function(){
 $(".field").change(function(){
  $(this).css("background-color","#FFFFCC");
 });
});
</script>
</head>
<body>
<p>在某个域被使用或改变时，它会改变颜色。</p>
Enter your name: <input class="field" type="text" />
<p>Car:
<select class="field" name="cars">
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="fiat">Fiat</option>
<option value="audi">Audi</option>
</select>
</p>
</body>
</html>

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I hope this article will be helpful to everyone’s jQuery programming.