Question

我很难在“嵌入”webelement中获取某些属性的值。我在页面中跟随WebElement，在浏览器中显示PDF：

<embed id="plugin" type="application/x-google-chrome-pdf" src="https://A-link.dk/plan/53--4c-c3-d5cd72ba/printGenerate.do?target=ON_RESIDENT&amp;format=PDF&amp;saveAsDocument=false&amp;printSelectionId=&amp;_=49365165116" stream-url="blob:chrome-extension://mhjfbmdgcfjbbpaeojofohoefgiehjai/95052284-bc11-44c9-a261-6000f48a75d4" 
headers="Cache-Control: 
Connection: Keep-Alive
Content-Disposition: inline; filename="planDto.pdf";
Content-Type: application/pdf
Date: Mon, 23 Jan 2017 14:47:47 GMT
Keep-Alive: timeout=5, max=90
Pragma: public
Server: Apache/2.4.6 (CentOS)
Transfer-Encoding: chunked
" background-color="0xFF525659" top-toolbar-height="56" full-frame="">

我正在尝试使用selenium chrome webdriver获取headers属性字符串。使用Chrome开发者控制台，我可以使用

检索值

document.getElementsByTagName("embed")[0].getAttribute("headers")

但在selenium java中我尝试这个：

String header = (String) ((JavascriptExecutor) driver.getDriver())
    .executeScript("return document.getElementsByTagName(\"embed\")[0].getAttribute(\"headers\");");

我得到一个空字符串。除此之外，我也尝试过：

WebElement img = driver.findElement(By.tagName("embed"));
String header = img.getAttribute("headers");

但是这会返回NULL。

当我尝试使用

获取src属性时，它工作正常

String src = (String) ((JavascriptExecutor) driver.getDriver())
    .executeScript("return document.getElementsByTagName(\"embed\")[0].getAttribute(\"src\");");

作为奖励，我可以说我只对文件名感兴趣，所以如果有更好/更简单的解决方案，请赐教。提前谢谢。

UPDATE V1 使用谷歌开发人员工具，我可以复制此源代码

  <html dir="ltr" lang="da"><head>
  <base href="chrome-extension://mhjfbmdgcfjbbpaeojofohoefgiehjai/">
  <meta charset="utf-8">
  <link rel="import" href="elements/viewer-error-screen/viewer-error-screen.html">
  <link rel="import" href="elements/viewer-page-indicator/viewer-page-indicator.html">
  <link rel="import" href="elements/viewer-page-selector/viewer-page-selector.html">
  <link rel="import" href="elements/viewer-password-screen/viewer-password-screen.html">
  <link rel="import" href="elements/viewer-pdf-toolbar/viewer-pdf-toolbar.html">
  <link rel="import" href="elements/viewer-zoom-toolbar/viewer-zoom-toolbar.html">

  <link rel="stylesheet" href="chrome://resources/css/text_defaults.css">
  <link rel="stylesheet" href="chrome://resources/css/roboto.css">
  <link rel="stylesheet" href="index.css">
<title>Print</title></head>
<body>

<viewer-pdf-toolbar id="toolbar" style="transform-origin: 50% 0px 0px; transform: none;"></viewer-pdf-toolbar>

<div id="sizer" style="width: 773px; height: 2239px;"></div>
<viewer-password-screen id="password-screen"></viewer-password-screen>

<viewer-zoom-toolbar id="zoom-toolbar" style="right: -8.5px; bottom: 0px;"></viewer-zoom-toolbar>

<viewer-page-indicator id="page-indicator" style="top: 0px; opacity: 0;"></viewer-page-indicator>

<viewer-error-screen id="error-screen"></viewer-error-screen>


<script src="toolbar_manager.js"></script><iron-a11y-announcer></iron-a11y-announcer>
<script src="viewport.js"></script>
<script src="open_pdf_params_parser.js"></script>
<script src="navigator.js"></script>
<script src="viewport_scroller.js"></script>
<script src="zoom_manager.js"></script>
<script src="pdf_scripting_api.js"></script>
<script src="chrome://resources/js/util.js"></script>
<script src="browser_api.js"></script>
<script src="pdf.js"></script>
<script src="main.js"></script>

<embed id="plugin" type="application/x-google-chrome-pdf" src="https://A-link.dk/questionnaire/schemeanswers/669bb12b-b7c2-4223-96d2-1ccca26147ce/printSchemeAnswer.do?reportId=" stream-url="blob:chrome-extension://mhjfbmdgcfjbbpaeojofohoefgiehjai/7aeb6fee-140b-4368-8b4b-537a019387de" headers="Connection: Keep-Alive
Content-Disposition: inline; filename=&quot;questionnaire.pdf&quot;
Content-Length: 23414
Content-Type: application/pdf
Date: Tue, 24 Jan 2017 13:16:49 GMT
Keep-Alive: timeout=5, max=99
Server: Apache/2.4.6 (CentOS)
" background-color="0xFF525659" top-toolbar-height="56" full-frame=""></body></html>

Answer 1

你确定这是正确的元素吗？ WebElement img = driver.findElement(By.tagName("embed"));

尝试WebElement img = driver.findElement(By.cssSelector("embed#plugin"));并查看它是否返回null。

Answer 2

我不知道这可能是您问题的可行解决方案。但是，由于您只对filename <embed>下面的代码感兴趣，可能会帮助您做同样的事情 -

String expectedData = null;

// Get the whole embed tag 
String tagdata = driver.findElement(By.id("plugin")).getAttribute("outerHTML");

// use regex expression to extract only your required file from the headers attribute
 Pattern patern = Pattern.compile("filename=\"(.+)\";");
 Matcher match = patern.matcher(tagdata);
 if (match.find()) 
 {
    expectedData = match.group(1);
 }
 System.out.println("Result is ="+ expectedData);

说明： - 以上代码将获取<embed>代码数据，并与regex中的filename匹配，并将结果作为预期文件检索

无法获取所有属性值

2 个答案: