限制多行文本框输入字符长度(两种方法)

原文:小山 http://www.cnblogs.com/singlepine/archive/2005/10/31/265807.html
方法一:弹出对话框提示
1.html代码

< HTML >
    
< HEAD >
        
< title > WebForm6 title >
        
< meta  name ="GENERATOR"  Content ="Microsoft Visual Studio .NET 7.1" >
        
< meta  name ="CODE_LANGUAGE"  Content ="C#" >
        
< meta  name ="vs_defaultClientScript"  content ="JavaScript" >
        
< meta  name ="vs_targetSchema"  content ="http://schemas.microsoft.com/intellisense/ie5" >
        
< script  language ="javascript" >             
            
function isOver(sText,len)
            
{
                
var intlen=sText.value.length;
                
if (intlen>len)
                
{
                    alert(
"The content length must Less than or Equal "+len);
                    sText.focus();
                    sText.select();
                }

            }

        
script >
    
HEAD >
    
< body  MS_POSITIONING ="GridLayout" >
        
< form  id ="Form1"  method ="post"  runat ="server" >
            
< asp:TextBox  id ="txtName"  style ="Z-INDEX: 102; LEFT: 200px; POSITION: absolute; TOP: 104px"  runat ="server"
                TextMode
="MultiLine"  Height ="112px"  Width ="271px" > asp:TextBox >
        
form >
    
body >
HTML >
2.cs代码
private   void  Page_Load( object  sender, System.EventArgs e)
        
{
            
this.txtName.Attributes.Add("onblur","isOver(this,1000);");
        }
方法二:限制用户继续输入
< HEAD >
    

    

    
< SCRIPT  LANGUAGE ="JavaScript" >










    
SCRIPT >
    

HEAD >
< BODY >
    

    
< center >
        
< form  name ="myform"  action ="YOUR-SCRIPT.CGI" >
            
< font  size ="1"  face ="arial, helvetica, sans-serif" > ( You may enter up to 125 
                characters. )
< br >
                
< textarea  name ="message"  wrap ="physical"  cols ="28"  rows ="4"  onKeyDown ="textCounter(this.form.message,this.form.remLen,125);"
                    onKeyUp
="textCounter(this.form.message,this.form.remLen,125);" > textarea >
                
< br >
                
< input  readonly type ="text"  name ="remLen"  size ="3"  maxlength ="3"  value ="125" >  characters 
                left
font >
        
form >
    
center >
    
< p >< center >
            
< font  face ="arial, helvetica"  SIZE ="-2" > Free JavaScripts provided < br >
                by 
< href ="http://javascriptsource.com" > The JavaScript Source a > font >
        
center >
BODY >

转载于:https://www.cnblogs.com/hermes262/archive/2006/08/11/474223.html

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