iframe上的onload事件在IE和Firefox / GoogleChrome中的工作方式不同

onload event on iframe working differently in ie and firefox/googlechrome

本文关键字：GoogleChrome 工作 方式不 Firefox onload 上的 事件 IE iframe      更新时间：2023-09-26

这是我的 iframe 的 ASPX 页面

 <asp:UpdatePanel ID="dynamicForm" runat="server" UpdateMode="Conditional">
            <ContentTemplate>                    
                <iframe id="iTargetLoader" name="iTargetLoader" width="200" height="50" onload="onLoadFn()"></iframe> 
            </ContentTemplate>
   </asp:UpdatePanel>

这是我在JavaScript中用于iframe的Onload事件的Onloadfn函数

function onLoadFn() {
        //debugger;        
        document.getElementById("iTargetLoader").contentWindow.document.defaultView.frameElement.innerText;
        var frame = document.getElementById("iTargetLoader");
        var contentDoc = (frame.contentWindow || frame.contentDocument);        
        if (contentDoc != null && contentDoc.document.body != null) {            
            var serverResult = contentDoc.document.body.innerText;            
            var regSuccess = /success/i;
            if (regSuccess.test(serverResult)) {                
                if (parseInt($('#ContentPlaceHolder1_hdn_qstnadd').val()) == 1) {                    
                        addQuestion();                                   
                    $('#ContentPlaceHolder1_hdn_qstnadd').val(0);
                }                                  
                //alert('success!');
                //return "success!";
            }
            else {
                if ($.trim(serverResult) == "") {
                    //alert("empty!");
                }
                else {
                    alert("failed!" + serverResult + "Please Contact Your Administrator!");
                    window.parent.window.open("", "_self");
                    window.parent.window.close();
                }
                //return "failure!";
            }
        }
        else {
            return "";
        }
    }

在这里，来自 servlet 的反馈被加载到 iframe 中，即"iTargetLoader"，我正在尝试在加载后检查 iframe 的内容是否成功。它在IE中工作正常，但是当我在onload事件中使用火狐或谷歌浏览器时，iframe的加载没有完成，因此内部html显示为null。但是在IE中，加载首先完成，innerhtml显示反馈。我该如何解决它？

所以你的问题更多的是让它跨浏览器兼容：然后让我们把怪癖拿出来...

HTML 或 ASPX

使用引用this，这样就不需要多次获取该对象。

<iframe id="iTargetLoader" name="iTargetLoader" width="200" height="50" onload="javascript: onLoadFn(this);"></iframe>

.JS

// a global function needs to be defined first before it can be used
// most likely not an issue in this example but
// similar to addQuestion you might want to change it to IIFE
// http://en.wikipedia.org/wiki/Immediately-invoked_function_expression
function onLoadFn(frame) {
    // define your variables
    var contentDoc,
        serverResult,
        regSuccess = /success/i,
        qstnadd;
    // test your parameter exists, in this case the iframe (this)
    if (frame) {
        // Note: Because of security reasons, the contents of a document can be accessed from another document only if the two documents are located in the same domain.
        // Note: Internet Explorer 8 (and higher) supports the contentDocument property only if a !DOCTYPE is specified. For earlier versions of IE, use the contentWindow property.
        contentDoc = frame.contentWindow || frame.contentDocument;
        if (contentDoc) {
            // testing the proper document object here
            if (contentDoc.document){
                contentDoc = contentDoc.document;
            }
            serverResult = contentDoc.body.innerText || "";
            if (regSuccess.test(serverResult)) {
                // request your object once
                // .Net supports something like IDMode static which can help to determine the ID here.
                qstnadd = $('#ContentPlaceHolder1_hdn_qstnadd');
                // use a raddix when using parseInt
                if (parseInt(qstnadd.val(), 10) === 1) {
                    addQuestion();
                    qstnadd.val(0);
                }
            } else {
                // looks trivial to me
                if ($.trim(serverResult) === "") {
                    alert("empty");
                } else {
                    alert("failed!" + serverResult + "Please Contact Your Administrator!");
                    window.parent.window.open("", "_self");
                    window.parent.window.close();
                }
            }
        }
    }
}

即使这不能直接解决您的问题，我相信您也可以通过这种方式更好地查明问题。疯狂猜测，您的问题出在contentDoc.document，因为您请求的是window.document.body或document.body，但不是window.document.document.body尽管后者可能在IE中工作^^

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