JQuery How to set attribute of element using other attribute of the same element

Question

I want to set title text of a link calling a function which receives as parameter the id of the element and outputs the text.

something like

$(a).attr('title', function() {return $(this).id + "foo"});

but a construct like this doesn't exist as far I know. What can I do? Thanks.

Answer 1

Use $(this).attr('id') or this.id. Do not mix them.

$(a).attr('title', function() {return $(this).attr('id') + "foo"});
$(a).attr('title', function() {return this.id + "foo"});        // <-- Preferred
//^ Is this a a variable? If not, you have to quote it: $("a").attr( ... );