日期:2014-05-16 浏览次数:20730 次
使用ajax进行表单验证,不是什么新鲜事了,如何控制自如呢?假如你有以下需求
1,验证不通过不显示提交按钮
2,表单中有若干项,不是必须填写的,若填写,则进行验证
3,表单中若干项,必须填写必须验证
你不妨参考以下例子,本示例ajax处理采用asp,当然你可以改写成其他语言?
?index.html页面代码如下
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <script src="ajax.js" language="javascript" type="application/javascript" ></script> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>AJAX表单验证</title> </head> <body> <form id="form1" name="form1" method="post" action=""> <table width="744" border="0" align="center" cellpadding="0" cellspacing="0"> <tr> <td width="230">用户名(长度大于8,qwer已存在):</td> <td width="293"> <input name="txtUsername" type="text" id="txtUsername" size="40" /></td> <td height="20" ><img src="yes.gif" width="16" height="16" style="display:none" id="imgUsernameCorrect"/><img src="no.gif" width="16" height="16" style="display:none" id="imgUsernameError"/><div id="txtUsernameError" style="float:right;" ></div></td> </tr> <tr> <td width="230">密码(长度大于8):</td> <td><input name="txtPassword" type="password" id="txtPassword" size="40" /> </td> <td ><img src="yes.gif" width="16" height="16" style="display:none" id="imgPasswordCorrect" /><img src="no.gif" width="16" height="16" style="display:none" id="imgPasswordError" /><div id="txtPasswordError"></div></td> </tr> <tr> <td width="230">电子邮件:</td> <td><input name="txtEmail" type="text" id="txtEmail" size="40" /></td> <td><img src="Yes.gif" width="16" height="16" style="display:none" id="imgEmailCorrect" /><img src="no.gif" width="16" height="16" style="display:none" id="imgEmailError" /><div id="txtEmailError"></div></td> </tr> <tr> <td width="230"> </td> <td><input type="submit" onclick="javascript:confirm('感谢你参与测试!!!');" name="submit" id="btnSubmit" value="还不能注册,请按格式规范填写各项信息" /></td> <td width="221"> </td> </tr> </table> </form> </body> </html>
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ajax.js文件如下
var oXmlHttp; function createXMLHttpRequest() { if(window.ActiveXObject) { oXmlHttp = new ActiveXObject("Microsoft.XMLHttp"); } else if(window.XMLHttpRequest) { oXmlHttp = new XMLHttpRequest(); } } function isFormValid () { var frmMain = document.forms[0]; var blnValid = true; for(var i=0;i < frmMain.elements.length;i++) { if(typeof frmMain.elements[i].valid == "boolean") { blnValid = blnValid && frmMain.elements[i].valid; } } return blnValid; } function validateField(oEvent) { oEvent = oEvent || window.event; var txtField = oEvent.target || oEvent.srcElement; createXMLHttpRequest();//zXmlHttp.createRequest(); oXmlHttp.open("get","validate.asp?" + txtField.name + "=" + encodeURIComponent(txtField.value),true); oXmlHttp.onreadystatechange = function () { if (oXmlHttp.readyState == 4) { if (oXmlHttp.status == 200) { var arrInfo = oXmlHttp.responseText.split("||"); var imgError = document.getElementById("img"+txtField.id.substring(3)+"Error"); var imgCorrect =document.getElementById("img"+txtField.id.substring(3)+"Correct"); var txtError = document.getElementById("txt"+txtField.id.substring(3)+"Error"); var btnSubmit = document.getElementById("btnSubmit"); if (!eval(arrInfo[0])) { imgError.title = arrInfo[1]; imgError.style.display = ""; imgCorrect.styl