在html页面中搜索特定标签 [英] Search for a particular tag in a html page

问题描述

如何在html文件中搜索特定标签?例如，如果我的html页面的中间位置有h1标签，那么如何以编程方式确保我的页面具有该特定标签?

How can I search for a particular tag in a html file? For example if my html page has h1 tag somewhere in the middle, how to ensure programmatically that my page has that particular tag?

推荐答案

一旦加载了文档，只需执行string.IndexOf("<mytag>")</mytag>.如果该方法返回的值小于0，则说明您所寻找的字符串不存在.它比使用DOM更快.

Once you get your document loaded, just do a string.IndexOf("<mytag>")</mytag>. If the method returns anything less that 0, the string you were looking for doesn''t exist. It''s faster than using the DOM stuff.

您可以尝试使用此DOM方法..


x.getElementById(id)-获取具有指定ID的元素
x.getElementsByTagName(name)-获取具有指定标签名称的所有元素

x是节点对象(HTML元素)

hi TRY USING this DOM methods..


x.getElementById(id) - get the element with a specified id
x.getElementsByTagName(name) - get all elements with a specified tag name

x is a node object (HTML element)

indexOf应该按照提示工作，仅对于替代，您可以使用string.Contains()方法.

indexOf should work as told, just for an alternative you could use string.Contains() method.

string str = "<h1>some_unnecessary_string</h1>";

包含方法的示例:

Example for contains method:

bool result = str.Contains("<h1>");

或用于完整标签搜索的正则表达式:

or regular expressions for a complete tag search:

bool result = check(str);
bool check(string source)
{
    return new Regex("<h1>.*?</h1>").IsMatch(source);
}

这篇关于在html页面中搜索特定标签的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！