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<!DOCTYPE html>
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<html lang="zh">
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<head>
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<meta charset="utf-8" />
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<title>图片跨域上传示例 - Editor.md examples</title>
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<link rel="stylesheet" href="css/style.css" />
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<link rel="stylesheet" href="../css/editormd.css" />
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<link rel="shortcut icon" href="https://pandao.github.io/editor.md/favicon.ico" type="image/x-icon" />
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</head>
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<body>
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<div id="layout" style="height: 2000px;background: #f6f6f6;">
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<header>
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<h1>图片跨域上传示例</h1>
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<p>Image cross-domain upload example.</p>
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</header>
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<div id="test-editormd">
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<textarea style="display:none;">#### Settings
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```javascript
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{
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imageUpload : true,
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imageFormats : ["jpg", "jpeg", "gif", "png", "bmp", "webp"],
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imageUploadURL : "http://xxxxxxx/editor.md/examples/php/cross-domain-upload.php?test=dfdf",
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crossDomainUpload : true,
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uploadCallbackURL : "http://xxxxxx/upload_callback.html?test=dfdf"
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}
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```
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#### 跨域上传原理
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利用 iframe 来实现，A 站 POST 到 B 站，B 站处理上传后再跳转回到 A 站的 callback 页面，callback 页面此时在 iframe 内（即同域下），再通过 window.parent 就可以操作父页面的任意元素了。
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#### 跨域上传示例 PHP 版
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当前域名：blog.xxx.com/post.php
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```html
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<form method="post" target="upload-iframe" enctype="multipart/form-data" action="http://static.xxx.com/uploader.php?callback=http://blog.xxx.com/upload-callback.html">
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<input type="file" name="file" accept="image/*" />
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<input type="submit" id="submit" value="开始上传" />
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</form>
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<iframe name="upload-iframe" style="display:none;" frameborder="0"></iframe>
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```
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图片服务器：static.xxx.com/uploader.php
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```php
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<?php
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header("Access-Control-Allow-Origin: *"); // Setting allow domian name
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$file = 'uploads/' . $_FILES['file']['name'];
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// 详细过程略
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move_uploaded_file($_FILES['file']['tmp_name'], $file);
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$location = $_GET['callback'].'?success=1&message=xxxxxxx&url=http://static.xxx.com/2015/02/15'.$file.'&temp='.date('ymdhis');
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header('location:' . $location);
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exit;
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?>
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```
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当前域名：blog.xxx.com/upload-callback.html
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```html
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<script type="text/javascript">
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var query = {};
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var urlParams = window.location.search.split('?')[1];
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urlParams = urlParams.split("&");
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for (var i = 0; i< urlParams.length; i++) {
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var param = urlParams[i].split("=");
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query[param[0]] = param[1];
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}
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var imageDialog = window.parent.document.getElementById(query['dialog_id']);
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//console.log(imageDialog, window.parent.document, window.parent, query);
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</script>
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```</textarea>
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</div>
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</div>
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<script src="js/jquery.min.js"></script>
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<script src="../editormd.js"></script>
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<script type="text/javascript">
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$(function() {
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var testEditor = editormd("test-editormd", {
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width : "90%",
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height : 640,
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markdown : "",
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path : '../lib/',
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imageUpload : true,
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imageFormats : ["jpg", "jpeg", "gif", "png", "bmp", "webp"],
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imageUploadURL : "http://www.ipandao.com/editor.md/examples/php/cross-domain-upload.php?test=dfdf",
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crossDomainUpload : true,
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uploadCallbackURL : "http://localhost/editor.md/examples/php/upload_callback.html?test=dfdf"
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/*
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跨域时，上传的图片服务器后台只需要返回一个跳转 URL 并跳转到原页面同域下的 callback 页面，结构如下：
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{
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success : 0 | 1, // 0 表示上传失败，1 表示上传成功
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message : "提示的信息，上传成功或上传失败及错误信息等。",
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dialog_id : $_GET['dialog_id'],
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url : "远程图片地址" // 上传成功时才返回
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}
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*/
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});
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});
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</script>
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</body>
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</html>
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