[英]jQuery or JavaScript equivalent of PHP strpos function to find string on a page
Is there an equivalent function in JavaScript or jQuery similar to strpos
in PHP? JavaScript或jQuery中的等效函数是否类似于PHP中的
strpos
?
I want to locate a string inside an element on a page. 我想在页面上的元素中找到一个字符串。 The string I'm looking for is:
我正在寻找的字符串是:
td class="SeparateColumn"
I would like something where I can run it like this to find: 我想要一些我可以像这样运行的东西来找到:
if $("anystring")
then do it
I assume you mean check whether a string contains a character, and the position in the string - you'd like to use the indexOf()
method of a string in JS. 我假设你的意思是检查一个字符串是否包含一个字符,以及字符串中的位置 - 你想在JS中使用字符串的
indexOf()
方法。 Here are the relevant docs . 以下是相关文档 。
Okay, so you'd like to search the whole page! 好的,所以你想搜索整个页面! The
:contains()
selector will do that. :contains()
选择器会这样做。 See the jQuery docs for :contains
. 请参阅jQuery文档
:contains
。
To search every element in the page, use 要搜索页面中的每个元素,请使用
var has_string = $('*:contains("search text")');
If you get jQuery elements back, then the search was a success. 如果你回来了jQuery元素,那么搜索就是成功的。 For example, on this very page
例如,在这个页面上
var has_string=$('*:contains("Alex JL")').length
//has_string is 18
var has_string=$('*:contains("horsey rodeo")').length
//has_string if 0. So, you could an `if` on this and it would work as expected.
You don't need jquery for this -- plain old Javascript will do just fine, using the .indexof()
method. 你不需要jquery - 使用
.indexof()
方法,普通的旧Javascript就可以了。
However if you really want an exact syntax match for PHP's strpos(), something like this would do it: 但是,如果你真的想要PHP的strpos()的精确语法匹配,这样的事情会这样做:
function strpos (haystack, needle, offset) {
var i = (haystack+'').indexOf(needle, (offset || 0));
return i === -1 ? false : i;
}
Note: This function taken from here: http://phpjs.org/functions/strpos:545 注意:此函数取自此处: http : //phpjs.org/functions/strpos : 545
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