这个问题似乎很难理解,所以我会尽力说明。
假设我有以下index.html正文:
<iframe name="parent"></iframe>
在parent
iframe中,我加载了以下页面正文:
<iframe name="nested-navigation"></iframe>
<iframe name="nested-parent"></iframe>
在nested-parent
iframe内,我加载了另一个页面。在其他页面中,我需要以某种方式访问顶级(index.html)文档parent
iframe,以便我可以使用nested-parent
iframe内容大小调整其内容的高度。
我使用嵌套页面主体的加载内容正确调整了index.html的parent
iframes高度。但是,在下一个嵌套中,我无法访问index.html
文档上下文,因此无法获取parent
iframe元素。
我需要帮助找出如何到达index.html的parent
iframe。我该怎么做?
页面在线,可以在此处查看效果:
www.ngeneersinc.com
如果您点击Projects
导航链接,它将正确加载页面并调整parent
iframe的大小。遗憾的是,当您单击此嵌套页面中的Ngen
导航链接时,顶级(index.html)iframe(parent
)不会调整大小,内容会被切割为任何高度设置为上一页。
编辑:
基本上,我试图在我的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
答案 0 :(得分:1)
您可以使用以下jQuery插件来完成此任务:
http://benalman.com/projects/jquery-postmessage-plugin/
然后将以下代码添加到您在iframe文档和父窗口中包含的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));
}
});
});
然后使用以下代码在父窗口中创建iframe:
<script type="text/javascript">
$(document).ready(function () {
CreateFrame("#someiFrameContainer", url);
});
</script>
<div id="someiFrameContainer"></div>
然后,每次iFrame内部文档的高度更改都会从iFrame页面调用此函数:
SetHeight();
这将导致iframe页面将包含其新总高度的消息发送到其父窗口(支持跨域),这将捕获消息并更新iframe的大小。这要求父窗口还包括上面的脚本文件,因为此文件注册事件和函数以在使用CreateFrame();
时自动处理这些消息