JavaScript Error: Uncaught Error: Syntax error, unrecognized expression: input#comment_1/2

Question

I am getting java script error like :

Uncaught Error: Syntax error, unrecognized expression: input#comment_1/2

the only comment keyword i have used in cshtml file is in this line code.

 <input placeholder="Enter your comments" type="text" style="width:800px;" id="comment_@item/@kpi.Id" name="comment_@item/@kpi.Id" />

i did not use comment keyword any where in java script, But i am getting this error. Thanks.

If you are using the id as a selector then you need to escape those special characters like `'#comment_\\@item\\/\\@kpi\\.Id'` — Arun P Johny, Jul 28 '15 at 09:54

score 0 · Accepted Answer · edited May 23 '17 at 10:24

This is happening because comment_@item/@kpi.Id is not a valid value for an element's ID, so jQuery is unable to parse your selector.

From the HTML4 spec:

ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".").

The solution is to use a valid value for your ID. see answer

JavaScript Error: Uncaught Error: Syntax error, unrecognized expression: input#comment_1/2

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