ASP.NET页面借助IFrame提交表单数据所遇到问题的解决方法分享

时间:2022-09-12 15:38:16

首先看下面的代码片段,我们希望用户在点击页面上的Button时首先将数据提交到指定的第三方页面,然后再执行后台的Page_Load事件。 

复制代码代码如下:


<body> 
<iframe id="WebGatewaySubmissionProcessor_IFrame" name="WebGatewaySubmissionProcessor_IFrame" style="display: none;"></iframe> 
<form onsubmit="javascript:if (typeof WebGatewayDoubleSubmission != 'undefined') {WebGatewayDoubleSubmission(this);}" id="Form1" runat="server"> 
<div id="page"> 
<asp:Button ID="BtnClientSend" runat="server" /> 
</div> 
<script type="text/javascript" id="WebGatewayScript"> 
WebGatewayDoubleSubmission = function(o) { 
var oldAction = o.action; 
var oldOnSubmit = o.onsubmit; 
var oldTarget = o.target; 
var oldMethod = o.method; 
var iframeSubmisionTarget = document.getElementById("WebGatewaySubmissionProcessor_IFrame"); 
var submitPostIframeSubmission = function() { 
o.action = oldAction; 
o.target = oldTarget; 
o.method = oldMethod; 
o.onsubmit = oldOnSubmit; 
o.submit(); 
}; 
/*iframeSubmisionTarget.onload = submitPostIframeSubmission;*/ 
eventPush(iframeSubmisionTarget, 'load', submitPostIframeSubmission); 
o.action = "http://webgateway.hostedmscrm.com/V2/formprocessor.aspx"; 
o.target = "WebGatewaySubmissionProcessor_IFrame"; 
o.onsubmit = null; 
o.method = "POST"; 
o.submit(); 
}; 
WebGatewaySubmission = function(o) { 
o.action = "http://webgateway.hostedmscrm.com/V2/formprocessor.aspx"; 
o.method = "POST"; 
}; 
function eventPush(obj, event, handler) { 
if (obj.addEventListener) { 
obj.addEventListener(event, handler, false); 
} else if (obj.attachEvent) { 
obj.attachEvent('on' + event, handler); 


</script> 
</form> 
</body> 


Form中的onsubmit事件在页面被提交时触发,此时首先执行WebGatewayDoubleSubmission脚本方法,在该方法中,将当前Form的action,onsubmit,target,method缓存到指定的变量中,然后将Form的action和target指向另一个页面进行提交,此时页面上的数据被Post到第三方页面。然后再使用页面上隐藏的IFrame来调用submitPostIframeSubmission方法,并将原先的Form进行提交。这里有一个问题,在上面的代码中有一行被注释掉了,原因就是直接使用IFrame的onload方法并不能触发该事件,从而导致submitPostIframeSubmission方法不能执行,页面的第二次提交不成功!使用eventPush方法可以有效地解决该问题。 
同时,在服务端的Page_Load事件中,需要使用IsPostBack来判断页面是否被提交了: 

复制代码代码如下:


protected void Page_Load(object sender, EventArgs e) 

if (Page.IsPostBack) 

//TODO: 

 

相关资料:
http://www.4ucode.com/Study/Topic/1087401 
http://wiki.operamasks.org/pages/viewpage.action?pageId=1835020