Javascript HTML5从嵌套iframe内部调整顶级文档iframe的大小

这个问题似乎很难理解，所以我将尽我所能加以说明

假设我有以下index.html主体：

<iframe name="parent"></iframe>

在

nested parent

iframe中，我加载另一个页面。在另一个页面中，我需要以某种方式进入顶层（index.html）文档

parent

iframe，这样我就可以使用

nested parent

iframe内容大小调整其内容的高度

我使用嵌套页面正文的加载内容正确地调整index.html的

父项

iframes高度。但是，在下一次嵌套中，我无法访问

index.html

文档上下文，因此无法获取

父元素

iframe元素

我需要关于如何访问index.html的

parent

iframe的帮助。我该怎么做

该页面处于联机状态，可以在此处查看效果：

www.ngeneersinc.com

如果单击

Projects

导航链接，它将正确加载页面并调整父级

iframe的大小。遗憾的是，当您单击此嵌套页面内的
Ngen
导航链接时，顶级（index.html）iframe（
parent
）没有调整大小，内容被剪切到上一页中设置的任何高度

编辑：

基本上，我正在尝试在javascript函数中执行以下操作：

var e = document.getElementById("nested-parent").contentWindow; // which is OK
var x = e.contentWindow; // which is 'undefined' because I lost the context of the index.html document

您可以使用以下jQuery插件来完成此任务：


然后将以下代码添加到包含在iframe文档和父窗口中的javascript文件中：

var iFrames = [];
var iFrameCounter = 0;

// Get the parent page URL as it was passed in, for browsers that don't support
// window.postMessage
var parent_url = decodeURIComponent(document.location.hash.replace(/^#/, ''));

// The first param is serialized using $.param (if not a string) and passed to the
// parent window. If window.postMessage exists, the param is passed using that,
// otherwise it is passed in the location hash (that's why parent_url is required).
// The second param is the targetOrigin.
function SetHeight() {
    var id = Number(parent_url.replace(/.*#(\d+)(?:&|$)/, '$1'));
    $.postMessage({ if_height: $(document).outerHeight(true), id: id }, parent_url, parent);
};

// Adds the iframe for the given url to the given container
function CreateFrame(container, url) {
    $(function () {
        // Pass the parent page URL into the Iframe in a meaningful way
        var src = url + '#' + encodeURIComponent(document.location.href + "#" + iFrameCounter);

        // Append the iFrame into the DOM.
        var html = '<iframe id="iFrame' + iFrameCounter + '" src="' + src + '" width="100%" scrolling="no" frameborder="0">Your browser lacks support for iFrames!<\/iframe>';
        iFrames[iFrameCounter] = { id: "iFrame" + iFrameCounter, container: container, if_height: 0 };

        // Add iFrame to DOM
        $(container).append($(html));
        iFrameCounter++;
    });
}

$(function () {
    // Setup a callback to handle the dispatched MessageEvent event. In cases where
    // window.postMessage is supported, the passed event will have .data, .origin and
    // .source properties. Otherwise, this will only have the .data property.
    $.receiveMessage(function (e) {

        // Get frameId
        var id = Number(e.data.replace(/.*id=([\d-]*).*/, '$1'));

        var frame = iFrames[id];

        // Get the height from the passsed data.
        var h = Number(e.data.replace(/.*if_height=([\d-]*).*/, '$1'));

        if (!isNaN(h) && h > 0 && h !== frame.if_height) {
            // Height has changed, update the iframe.
            $("#" + frame.id).css("height", (frame.if_height = h));
            $("#" + frame.id).css("min-height", (frame.if_height = h));
            $("#" + frame.id).css("max-height", (frame.if_height = h));

            // Also update the parent element of the iframe.
            $("#" + frame.id).parent().css("height", (frame.if_height = h));
            $("#" + frame.id).parent().css("min-height", (frame.if_height = h));
            $("#" + frame.id).parent().css("max-height", (frame.if_height = h));
        }
    });
});

<script type="text/javascript">
     $(document).ready(function () {
         CreateFrame("#someiFrameContainer", url);
     });
</script>
<div id="someiFrameContainer"></div>

这将导致iframe页面向其父窗口（支持跨域）发送一条包含其新总高度的消息，父窗口将捕获该消息并更新iframe的大小。这要求父窗口还包括上面的脚本文件，因为该文件注册事件和函数，以便在使用
CreateFrame（）时自动处理这些消息
您可以使用以下jQuery插件来完成此任务：


然后将以下代码添加到包含在iframe文档和父窗口中的javascript文件中：

var iFrames = [];
var iFrameCounter = 0;

// Get the parent page URL as it was passed in, for browsers that don't support
// window.postMessage
var parent_url = decodeURIComponent(document.location.hash.replace(/^#/, ''));

// The first param is serialized using $.param (if not a string) and passed to the
// parent window. If window.postMessage exists, the param is passed using that,
// otherwise it is passed in the location hash (that's why parent_url is required).
// The second param is the targetOrigin.
function SetHeight() {
    var id = Number(parent_url.replace(/.*#(\d+)(?:&|$)/, '$1'));
    $.postMessage({ if_height: $(document).outerHeight(true), id: id }, parent_url, parent);
};

// Adds the iframe for the given url to the given container
function CreateFrame(container, url) {
    $(function () {
        // Pass the parent page URL into the Iframe in a meaningful way
        var src = url + '#' + encodeURIComponent(document.location.href + "#" + iFrameCounter);

        // Append the iFrame into the DOM.
        var html = '<iframe id="iFrame' + iFrameCounter + '" src="' + src + '" width="100%" scrolling="no" frameborder="0">Your browser lacks support for iFrames!<\/iframe>';
        iFrames[iFrameCounter] = { id: "iFrame" + iFrameCounter, container: container, if_height: 0 };

        // Add iFrame to DOM
        $(container).append($(html));
        iFrameCounter++;
    });
}

$(function () {
    // Setup a callback to handle the dispatched MessageEvent event. In cases where
    // window.postMessage is supported, the passed event will have .data, .origin and
    // .source properties. Otherwise, this will only have the .data property.
    $.receiveMessage(function (e) {

        // Get frameId
        var id = Number(e.data.replace(/.*id=([\d-]*).*/, '$1'));

        var frame = iFrames[id];

        // Get the height from the passsed data.
        var h = Number(e.data.replace(/.*if_height=([\d-]*).*/, '$1'));

        if (!isNaN(h) && h > 0 && h !== frame.if_height) {
            // Height has changed, update the iframe.
            $("#" + frame.id).css("height", (frame.if_height = h));
            $("#" + frame.id).css("min-height", (frame.if_height = h));
            $("#" + frame.id).css("max-height", (frame.if_height = h));

            // Also update the parent element of the iframe.
            $("#" + frame.id).parent().css("height", (frame.if_height = h));
            $("#" + frame.id).parent().css("min-height", (frame.if_height = h));
            $("#" + frame.id).parent().css("max-height", (frame.if_height = h));
        }
    });
});

<script type="text/javascript">
     $(document).ready(function () {
         CreateFrame("#someiFrameContainer", url);
     });
</script>
<div id="someiFrameContainer"></div>

这将导致iframe页面向其父窗口（支持跨域）发送一条包含其新总高度的消息，父窗口将捕获该消息并更新iframe的大小。这要求父窗口还包括上面的脚本文件，因为该文件注册事件和函数，以便在使用
CreateFrame（）时自动处理这些消息
我没有使用上面所有的代码，但我找到了我需要的代码。非常感谢。我没有使用上面所有的代码，但我找到了我需要的部分。非常感谢。