设置DOMelement的nodeValue：error：尝试获取非对象的属性 [英] Setting nodeValue of a DOMelement : error :Trying to get property of non-object

问题描述

运行此php脚本时：

$doc = new DOMDocument();
    $doc->loadHTMLFile("some_url.html");
    $ele1 = $doc->getElementById ( "coupon" );
    if($ele1->length){
    $doc->getElementById ( "coupon" )->item(0)->nodeValue =$result["affiliate_name"] ;}

我得到：试图获取非对象的属性在最后一行
如果不是正确的方法，我该如何设置标签的文本，我必须提取它的id。

I get : Trying to get property of non-object in the last line if it's not the right way to do it, how can I set the text of tag that I must extract usig its Id.

这里是我的some_url.html：

here is my some_url.html :

  <div class="panel panel-success">
    <div class="panel-heading">
      <h3 id="coupon" class="panel-title">Coupon name 1</h3>
    </div>
<p id="coupon_id" hidden>coupon id</p>
    <div id="counter-up" class="panel-body">
      0
    </div>
  </div>

谢谢

推荐答案

根据官方文档， getElementById（）返回单个 DOMElement ，它扩展了 DOMNode ，它们又有你要改变的 $ nodeValue 字段。一个 DOMNode 不是一个 DOMNodeList ，所以它没有 $ length 字段和 item（）方法。因此，您不应该在该元素上调用 item（），您可以直接操作$ code $ $ nodeValue 。要查明是否存在这样的元素，只需测试 getElementById（）的结果，以便与 NULL （或使用 if（$ element）作为简写）。完整的代码将如下所示：

According to the official documentation, getElementById() returns a single DOMElement, which extends DOMNode, which in turn has the $nodeValue field you are trying to change. A DOMNode is not a DOMNodeList, so it has neither the $length field nor the item() method. Because of that, you aren't supposed to call item() on that element, you can directly manipulate its $nodeValue. To find out whether such element exists, simply test the result of getElementById() for equality with NULL (or use if ($element) as a shorthand). Complete code would look as follows:

$doc = new DOMDocument();
$doc->loadHTMLFile("some_url.html");
$ele1 = $doc->getElementById("coupon");
if ($ele1) $ele1->nodeValue = $result["affiliate_name"];

资料来源：

http://pl1.php.net/manual/en/domdocument.getelementbyid.php

< a href =http://pl1.php.net/manual/en/class.domelement.php =nofollow> http://pl1.php.net/manual/en/class.domelement.php

http://pl1.php.net /manual/en/class.domnode.php

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