问题
How is it possible to get the value of ID from class using google tag manager?
<html>
<body>
<textarea id='5' class='cp _check'>sometexthere</textarea>
</body>
<html>
Using JQuery it is possible with this:
$(".cp._check").attr("id")
回答1:
Go to variables, select new, type DOM. Select CSS selector. You can then use selectors similarly to jQuery:
Even though there might be multiple matches for your selector GTM retrieves the value for the first occurence only.
回答2:
I guess you should use following code: $("#cp_check").attr("id")
回答3:
Data Uniqueness
This can be unreliable until you cannot be sure that class cp_check is unique.
Data-attribution way
Rather change id from 5 to "form-text-field" (or whatever you want) and your desired value put into data-id:
<textarea id='form-text-field' data-id='5' class='cp _check'>sometexthere</textarea>
And then your jQuery wil looks like:
$("#form-text-field").attr("data-id")
Google Tag Manager
1) Create macro type JavaScript:
function(){
var dat = $("#form-text-field").attr("data-id");
return dat;
}
2) Or Create macro type DOM ELEMENT Method -> CSS Selector
- Selector: .cp_check (in your example) #form-text-field (in this example)
- Attr: id (in your example) data-id (in thisexample)
来源：https://stackoverflow.com/questions/31430820/getting-value-of-id-from-class