javascript textbox call event when value changes

后端未结

关注

 3  1468

予麋鹿

I have a textbox, and whenever the value of the box changes, I want to check and see if 20 digits have been entered.

I thought that I would use the onChange event, b

相关标签:

3条回答

[愿得一人]

2021-01-06 09:52

    <script>

function multy(val)
{
alert(val.value+"--"+val.id);
}

</script>
</head>
<body>
<input id="txtdemo" type="text" onchange="multy(this);"></br>
<input id="txtdemo" type="text" onchange="multy(this);">
</input>
</body>

Thanks... :)

0 讨论(0)

遇见更好的自我

2021-01-06 09:55
An effective way is to use a combination of onkeydown and onpaste, which will work in IE, Firefox, Chrome and Safari. Opera is the odd one out here because it doesn't support onpaste so you may have to fall back to onchange for Opera or use the DOMAttrModified mutation event, see example below.

Internet Explorer also supports onpropertychange, which will fire every time a property changes on an element -- including value. I have read that DOMAttrModified is supported by Opera and Safari (not sure about Firefox), so you could use that in combination with IE's onpropertychange (untested):
```
if ("implementation" in document &&
                   document.implementation.hasFeature('MutationEvents','2.0'))
    myInput.addEventListener("DOMAttrModified", valueChanged, false);    
else if ("onpropertychange" in myInput)
    myInput.onpropertychange = valueChanged;

function valueChanged (evt)
{
    var attr;
    evt = evt || window.event;
    attr = evt.attrName || evt.propertyName;

    if (attr == "value")
        validate();
}
```
0 讨论(0)
发布评论:

提交评论
- 加载中...

悲&欢浪女

2021-01-06 09:55

use onKeryPress event

 <input type="text" onKeyDown="CountText(this,200)" onpaste="return false;"> 

    function CountText(field, maxlimit) 
    {
       if (field.value.length < maxlimit) // if too long...trim it!
        {
            return true;
        }
        else
          return false;
    }

check my full article on : http://www.codeproject.com/KB/validation/MyTextBox.aspx

0 讨论(0)