<script type="text/javascript" language="javascript" > String.prototype.len=function(){ return this.replace(/[^\x00-\xff]/g,"**").length; } //Set maxlength for multiline TextBox function setMaxLength(object,length) { var result = true; var controlid = document.selection.createRange().parentElement().id; var controlValue = document.selection.createRange().text; if (controlid == object.id && controlValue != "") { result = true; } else if (object.value.len() >= length) { result = false; } if (window.event) { window.event.returnValue = result; return result; } } //Check maxlength for multiline TextBox when paste function limitPaste(object,length) { var tempLength = 0; if(document.selection) { if(document.selection.createRange().parentElement().id == object.id) { tempLength = document.selection.createRange().text.len(); } } var tempValue = window.clipboardData.getData("Text"); tempLength = object.value.len() + tempValue.len() - tempLength; if (tempLength > length) { tempLength -= length; var tt=""; for(var i=0;i<tempValue.len()-tempLength;i++) { if(tt.len()<(tempValue.len()-tempLength)) tt=tempValue.substr(0,i+1); else break; } tempValue=tt; window.clipboardData.setData("Text", tempValue); } window.event.returnValue = true; } </script>
为textbox添加事件s
TextBox1.Attributes.Add("onKeyPress", "javascript:setMaxLength(this,15)")
TextBox1.Attributes.Add("onpaste", "javascript:limitPaste(this, 15)")