Question

Please I have an input text and I want to add a class to it :

<input type="text" name ="var[1]" />

I tried this line but no success :

$('input[name=var[1]]').addClass('invalidField');

PS : This input does not exist in markup, but its displayed using ajax !

Answer 1

Use quotes and be sure to call it once the dom is ready :

$(function(){
    $('input[name="var[1]"]').addClass('invalidField');
});

The quotes are optional only when the value is “simple”. If it contains parenthesis, spaces, braces, etc., jQuery doesn’t get where the value ends and can’t parse the expression.