Question

对于任何具有特定知识的人来说，这一切都与WordPress“主题定制器”有关，尽管没有必要回答这个问题。

基本上，我有一个页面（在PHP中），其中包含一个设置的左侧“窗格”，它适用于iframe的内容，这是屏幕的右侧部分。

从概念上讲，我希望使用jQuery draggable通过可拖动功能调整主背景图像的CSS background-position。我需要在draggable()页面上应用customize.php，将脚本排入那里，然后在iframe中操作DOM。它需要在容器/父级别完成，因为在该级别有一个设置，它将更新X和Y坐标并将它们保存在那里存储的设置中。

我认为我需要的可能是不可能的，但我想知道是否可以使用javascript来执行以下：

获取iframe的内容
操纵iframe内的DOM ，通过draggable()调整背景图片并将background-position坐标存储为数据属性，然后将其保存到相应的设置输入字段

根据我的经验，从“父”/容器级别操纵iframe中的DOM很困难，我想知道是否有我不知道的东西，这绝对不可能，或者有一些解决方法？（请注意，原始域是相同的，因此不存在任何跨域iframe问题）

Answer 1

这是我的父iframe通信测试实现的简化代码。我添加了一些样本如何使用它。但我必须注意，它不在我的实验室部分，我目前没有时间检查它是否完全跨浏览器兼容。但如果不是，那么只会有一些小的改变。（编辑在当前chrome，ff和IE 6-9中测试）

我希望这会帮助你解决问题。但是我现在还不能保证它能够完美地工作（但我很确定）。

父级代码

<!doctype html>
<html>
<head>
    <meta http-equiv="Content-type" content="text/html; charset=utf-8">
    <title>index</title>
    <script src="jquery.js" type="text/javascript" charset="utf-8"></script>
    <script type="text/javascript" charset="utf-8">

    (function($, window, undefined) {

        var iframe;

        // the connector object the will be passed to the iframe and will be used as "API"
        var parentConnector = {
            _window   : window, // a reference to the parents window (not really necessary but nice to have)
            $ : $,              // a reference to the parents jQuery that can be accessed from the iframe (use with caution)

            // here you will define you "API" for the parent (the functions you want to call from the iframe )
            setElementValue : function(selector, value ) {
                $(selector).val(value);
            }

        }

        // this function is called by the iframe to register the iframe in the parent
        window.registerIFrame = function( iframeHelper ) {
            //if you have multible iframe in the parent you could change the code here to store them in e.g. an arrray or with a key in an object
            iframe = iframeHelper;

            // register the parent in the iframe
            iframe.registerParent(parentConnector);
        }



        $(document).on("click",".slideUp",function(event) {
            event.preventDefault();

            /*
            call a function on the helper object, this is the savest way for the commincation because
            there is it minimizes the risk to mix the differnt context
            */
            iframe.slideUp();

            /*
            This way would work at least in chrome, with the current version with jquery, but it relays the jQuery implementation
            that the correct document is used.
            */
            iframe.$(".info-from-parent").val("slideUp");

            /*
            One thing you should NEVER do is the following:

            iframe.$(".info-from-parent").append( $("<div></div>") );

            The reason you should not do this is because this mixes DOMElements of different context.
            This will result in unexpected crashes/bahaviors in some browsers (but could work in others, or at least it will look like it would work)
            */

        });


        // same as the slide down, it is just there to have some interaction sample
        $(document).on("click",".slideDown",function(event) {
            event.preventDefault();
            iframe.slideDown();
            iframe.$(".info-from-parent").val("slideDown");
        });


    })(jQuery, window);

    </script>
</head>
<body>
    <input type="text" class="info-from-iframe"><br>
    <a href="#" class="slideUp">slideUp</a> <a href="#" class="slideDown">slideDown</a><br>
    <iframe src="iframe.html"></iframe>

</body>
</html>

iframe的代码

<!doctype html>
<html>
<head>
    <meta http-equiv="Content-type" content="text/html; charset=utf-8">
    <title>iframe</title>
    <script src="jquery.js" type="text/javascript" charset="utf-8"></script>
    <script>

    (function($,window,undefined) {

        //the connector object the will be passed to the parent and will be used as "API"
        var iframeConnector = {

            _window : window,     // a reference to the iframes window (not really necessary but nice to have)
            _parent : undefined,
            $ : $,                // a reference to the iframes jQuery that can be accessed from the parent (use with caution)

            // this function is called by the parent to register the parent in the iframe
            registerParent : function( parent ) {
                this._parent = parent;
            },

            /* here you will define you "API" for the iframe (the functions you want to call from the parent )*/
            slideUp : function() {
                $(".test").slideUp();
            },

            slideDown : function() {

                $(".test").slideDown();
            },

            setElementValue : function(selector, value ) {
                $(selector).val(value);
            }

        };

        // register the iframe in the parent
        window.parent.registerIFrame(iframeConnector); 

        $(document).mousemove(function(event) {
            //use the parents "API" to call a function in the parent
            iframeConnector._parent.setElementValue(".info-from-iframe", event.clientX+", "+event.clientY);
        });

    })(jQuery,window);


    </script>
</head>
<body>
    <input type="text" class="info-from-parent"><br>
    <div class="test">
        iframe
    </div>
</body>
</html>

Javascript：数据可以通过iframe双向传递吗？

1 个答案: