转载: 打造自己的asp.net验证控件-白红宇

ASP.NET自带的验证控件具有使用方便，开发快捷等优点。开发人员不必使用js就可以方便地对页面各项控件进行输入验证。但是它也有些不足之处，如：界面单调，只能通过红色字体显示（当然自定义验证控件除外）；只能放在某一固定位置；需要占用一定的版面空间，如果错误消息比较长，会严重影响布局，即使将显示方式设为dynamic，当它显示错误消息时会撑大页面，影响美观，因此，我们有必要对它稍改进一下。

我们研究一下ASP.NET的js代码(下载页面中WebResource.axd?d=SD1NUwMQGhYXe3jLq5kyhRg80avbG6v4rFgfT8pf7Lg1&t=633409665581718750指向的文件）发现用来显示错误消息的是ValidatorUpdateDisplay这个函数来完成的，关键的一句，是 val.style.visibility = val.isvalid ? "hidden" : "visible";　如果我们想用alert方式显示的话，只需将这句改成alert(val.innerHTML)就可以了，但我们想做得更好看一点，做成类似于QQ聊天窗口的效果，效果可看下图：

要实现这个效果，需要以下几个图片。

以下是源码：

@ Page Language="C#" AutoEventWireup="true" CodeBehind="myvalid.aspx.cs" Inherits="Test.myvalid"

html

xmlns

="http://www.w3.org/1999/xhtml"

head

runat

="server"

title

无标题页

title

style

.MsgC

{

border-top:solid 1px #C6C3C6;

height:6px;

background-color:#FFFBEF;

font-size:1px;

}

.MsgL

{

BACKGROUND: url(images/vMsgL.gif) no-repeat left top;

width:7px;

height:6px;

}

.MsgR

{

BACKGROUND: url(images/vMsgR.gif) no-repeat ;

width:24px;

height:6px;

}

.MsgBL

{

BACKGROUND: url(images/vMsgBL.gif) no-repeat left top;

width:7px;

height:6px;

}

.MsgBC

{

BACKGROUND: url(images/vMsgBC.gif) repeat-x;

height:19px;

}

.MsgBR

{

BACKGROUND: url(images/vMsgBR.gif) no-repeat left top;

width:24px;

height:19px;

}

style

head

body

style

="font-size:12px"

form

="form1"

runat

="server"

div

style

="font-weight:bold;height:60px"

打造自己的验证控件：

div

姓名：

asp:TextBox

="TextBox1"

runat

="server"

></

asp:TextBox

asp:RequiredFieldValidator

="RequiredFieldValidator1"

runat

="server"

Display

="dynamic"

ControlToValidate

="TextBox1"

ErrorMessage

="请输入姓名！"

SetFocusOnError

="True"

></

asp:RequiredFieldValidator

证件号：

asp:TextBox

="TextBox2"

runat

="server"

></

asp:TextBox

asp:RequiredFieldValidator

="RequiredFieldValidator2"

runat

="server"

Display

="dynamic"

ControlToValidate

="TextBox2"

ErrorMessage

="请输入证件号!"

SetFocusOnError

="True"

></

asp:RequiredFieldValidator

asp:RegularExpressionValidator

="RegularExpressionValidator1"

runat

="server"

Display

="dynamic"

ControlToValidate

="TextBox2"

ErrorMessage

="证件号格式不符！"

ValidationExpression

="d{17}[d|X]|d{15}"

></

asp:RegularExpressionValidator

asp:Button

="Button1"

runat

="server"

Text

="确定"

form

body

html

script

type

="text/javascript"

function ValidatorUpdateDisplay(val) {

if (typeof(val.display) == "string") {

if (val.display == "None") {

return;

}

if (val.display == "Dynamic") {

//val.style.display = val.isvalid ? "none" : "inline";

// return;

}

if ((navigator.userAgent.indexOf("Mac") > -1) &&

(navigator.userAgent.indexOf("MSIE") > -1)) {

val.style.display = "inline";

}

ShowZfValidMsg(val);

// val.style.visibility = val.isvalid ? "hidden" : "visible";

}

function Page_ClientValidate(validationGroup) {

Page_InvalidControlToBeFocused = null;

if (typeof(Page_Validators) == "undefined") {

return true;

}

var i;

for (i = 0; i < Page_Validators.length; i++) {

ValidatorValidate(Page_Validators[i], validationGroup, null);

//Added By zhaofeng

if(!Page_Validators[i].isvalid)// only show one errmsg

{

Page_IsValid = false;

Page_BlockSubmit = !Page_IsValid;

return false;

}

//Added End

}

ValidatorUpdateIsValid();

ValidationSummaryOnSubmit(validationGroup);

Page_BlockSubmit = !Page_IsValid;

return Page_IsValid;

}

function ShowZfValidMsg(val)

{

//window.status = val.isvalid;

var tbId = "tbValidMsg";//+val.controltovalidate;

var tb = document.getElementById(tbId);

if(val.isvalid && tb == null) return;

if(tb == null)

{

tb = document.createElement("table");

tb.border= 0 ;

tb.id = tbId;

tb.cellSpacing = 0 ;

tb.cellPadding = 0 ;

var tr = tb.insertRow(0);

var cell = tr.insertCell(0);

cell.className = "MsgL";

cell = tr.insertCell(1);

cell.className = "MsgC";

cell.innerHTML = " ";

cell = tr.insertCell(2);

cell.className = "MsgR";

//the second row

tr = tb.insertRow(1);

cell = tr.insertCell(0);

cell.bgColor = "#FFFBEF";

cell.style.cssText= "border-left:solid 1px #C6C3C6";

cell.innerHTML = " "

cell = tr.insertCell(1);

cell.bgColor = "#FFFBEF";

cell.height = 40;

cell.innerHTML = "<div style='float:left;padding-top:1px'><img src='images/yellowalert.gif' /></div>"+

"<span style='color:black;font-size:12px;height:40px;width:100px;padding-top:10px;padding-bottom:10px;padding-right:0px;padding-left:3px'></span>";

cell = tr.insertCell(2);

cell.bgColor = "#FFFBEF";

cell.style.cssText= "border-right:solid 1px #C6C3C6";

cell.innerHTML = " "

//the third row

tr = tb.insertRow(2);

cell = tr.insertCell(0);

cell.className = "MsgBL";

cell = tr.insertCell(1);

cell.innerHTML = " ";

cell.className = "MsgBC";

cell = tr.insertCell(2);

cell.className = "MsgBR";

document.body.appendChild(tb);

tb.style.cssText= "position:absolute;zIndex:500";

}

tb.rows[1].cells[1].childNodes[1].innerHTML = val.innerHTML;

tb.style.display = val.isvalid?"none":"";

var obj = document.getElementById(val.controltovalidate);

if(obj !=null)

{

var ary = GetElePos(obj);

var l = ary[0]+obj.offsetWidth-tb.offsetWidth;

if(l<0) l= 0 ;

var t = ary[1]-tb.offsetHeight+15;

if(t<0) t = 0 ;

tb.style.left = l

tb.style.top = t;

}

return ;

}

function GetElePos(e)

{

var t=e.offsetTop;

var l=e.offsetLeft;

while(e=e.offsetParent){

t+=e.offsetTop;

l+=e.offsetLeft;

}

return [l, t];

}

script

本文转自灵动生活博客园博客，原文链接：http://www.cnblogs.com/ywqu/archive/2008/04/03/1136227.html

，如需转载请自行联系原作者