JavaScript input框输入实时校验

 1 <html>
 2     <head>
 3         <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 4         <title>及时验证title>
 5         <style>
 6             #error{
 7                 color:red;
 8                 font-weight:bold;
 9             }
10         style>
11         <script type="text/javascript">
12       // Firefox, Google Chrome, Opera, Safari, Internet Explorer from version 9
13             function OnInput (event) {
14                 //alert ("The new content: " + event.target.value);
15                 var value = event.target.value;
16                 checkusername(value);
17             }
18       // Internet Explorer
19             function OnPropChanged (event) {
20             console.info(event)
21                 if (event.propertyName.toLowerCase () == "value") {
22                     var value = event.srcElement.value;
23                     checkusername(value);
24                 }
25             } 
26         //验证用户名方法(只能是数字字母和中文,不能包括特殊字符)
27         function checkusername(value){
28             var regex = /^[0-9a-zA-Z\u4e00-\u9fa5]*$/;
29             if(regex.test(value) == true){
30                 //格式正确
31                 document.getElementById("error").innerHTML="";
32             }else{
33                 //格式错误
34                 document.getElementById("error").innerHTML="用户名格式错误,用户名由数字、字母、中文组成,不能包含特殊字符";
35             }
36         }
37         script>
38     head>
39     <body>
40         请输入用户名:
41         <input name="username" type="text" oninput="OnInput (event)" onpropertychange="OnPropChanged (event)" placeholder="数字、字母、汉字" /><label id="error">label>
42     body>
43 html>

 

转载于:https://www.cnblogs.com/xiaomili/p/6286320.html

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