Greasemonkey:在两个元素之间查找字符串

时间:2012-10-08 15:53:47

标签: javascript greasemonkey string-matching

我正在写一个Greasemonkey脚本,它应该做一件简单的事情:如果<h2>元素(页面上总是只有一个)和第一次出现<h3>之间有某个字符串元素(可以是其中几个或根本没有),然后......(我已经完成了这部分)。

我很感激有条件的帮助。

4 个答案:

答案 0 :(得分:2)

var masterString = document.body.innerHTML;
var start = masterString.indexOf('<h2>'); 
var end = masterString.indexOf('<h3>'); // Will find the position of first occurance of h3 - if any

if (end <0)
// there is no h3
else {
  var searchMe = masterString.substr(start,end);  // now this is the portion of your HTML body that you want to look for a string match
  var numberOfOccurances = searchMe.match(/yourString/g);
}

答案 1 :(得分:2)

现在我恰巧熟悉Mikhail正在研究的代码。

基本结构是

<div>
<div>
<h2>Something</h2>
<td>We want to search for the string here</td>
<td>We want to search for the string here</td>
</div>

<div>
<h3>Something else</h3>
<td>May contain the same string, but we are only interested if it contains in previous div .</td>
<td>May contain the same string, but we are only interested if it contains in previous div .</td>
</div>
</div>

字符串不是h2的子元素,所以我认为getElementsByTagName不起作用。不幸的是,实际上有数百个具有相同类ID的div层。在这种特殊情况下,标题是代码中唯一的唯一细节。所以在我看来,最好的方法是首先找到h2,转到它的父级并将文本存储为字符串。然后在文本中搜索字符串。这样的东西......

<script>
var searcharea = jQuery('h2').parent('div').text();
var searchstring = "superstring";
if( searcharea.indexOf( searchstring ) != -1 )
    alert("exchange alert to your own things");
</script>

至于h3,它可能存在也可能不存在,但由于它不是兄弟,它并不重要。 :)谢谢大家抽出时间回答我们的问题。

答案 2 :(得分:0)

您是否尝试过getElementsByTagName

答案 3 :(得分:0)

//get all the H2 elements
var h2 = document.getElementsByTagName("h2");

//Just in case there are more than one...
for(var i = 0; i < h2.length; i++){
 //check for the certain string
 if(h2[i].textContent == "SOME TEXT"){
  //get the first h3 element and do something...
  var h3 = document.getElementsBtTagName("h3")[0]; //first occurrence of H3
  //DO SOMETHING
}

https://developer.mozilla.org/en-US/docs/DOM/Node.textContent

https://developer.mozilla.org/en-US/docs/DOM/element.getElementsByTagName