html event attribute onchange triggered when element value changes

Example

Check the input field when the value changes:

<input type="text" name="txt" value="Hello" onchange="checkField(this.value)">

Browser support

IE

Firefox

Chrome

Safari

Opera

All major browsers support onchange attribute.

Definition and usage

onchange is triggered when the element value changes.

The onchange attribute applies to: , , and <select> elements. </select>

Differences between HTML 4.01 and HTML5

None.

Syntax

<element onchange="script">

Attribute value

Value	Description
script	Script to run when onchange occurs.

Example

Check the input field when the value changes:

<input type="text" name="txt" value="Hello" onchange="checkField(this.value)">

    
    
    
    

    
请修改输入字段中的文本，然后在字段外点击以触发 onchange。
        请输入文本：<input type="text" name="txt" value="Hello" onchange="checkField(this.value)">
    

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