如果包含某些文本，则运行 jquery
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if contains certain text, then run jquery
提问by user764728
I need to run a jquery only if the bold element contains particular text. What am I doing wrong?
仅当粗体元素包含特定文本时，我才需要运行 jquery。我究竟做错了什么？
<script>
if ($('b:contains('Choose a sub category:')')) {
$("td.colors_backgroundneutral").css("background-color","transparent");
$("td.colors_backgroundneutral").children(':first-child').attr("cellpadding","0");
};
</script>
回答by Thomas Shields
Besides using single quotes inside single quotes, which breaks the string, you're using a jQuery selector inside an if statement. This selectoronly filters your btags to those which contain "Choose a sub category"; and then returns a list of those elements. It does not return a boolean. Instead, use the .contains()method, like so:
除了在单引号内使用单引号（这会破坏字符串）之外，您还在 if 语句中使用了 jQuery 选择器。此选择器仅将您的b标签过滤为包含“选择子类别”的标签；然后返回这些元素的列表。它不返回布尔值。相反，使用该.contains()方法，如下所示：
if($("b").contains("Choose a sub category")) {
// do stuff
}
if($("b").contains("Choose a sub category")) {
// do stuff
}
You can read more here
你可以在这里阅读更多
EDIT:since the .contains()method appears to be deprecated, here's a pure JS solution:
编辑：由于该.contains()方法似乎已被弃用，这是一个纯 JS 解决方案：
var el = document.getElementById("yourTagId") // or something like document.getElementsByTagName("b")[0] if you don't want to add an ID.
if (el.innerHTML.indexOf("Choose a sub category") !== -1) {
// do stuff
}
回答by dev4life
I have always used this to determine if an element exists:
我一直用它来确定一个元素是否存在：
if ($('b:contains("Choose a sub category:")').length > 0) { /*do things*/}
回答by BTC
if ($("b").has(":contains('Choose a sub category:')").length) {
/*Your Stuff Here*/
}
