Question

In this jQuery, I’m able to bind the paste event to validate the form field, but my method inside the function is apparently wrong. I’m not getting an alert at all.

I just want to trim the text that’s input and return that as the value of the form input text field #adsense_client_id.

$("#adsense_client_id").bind('paste', function(e) {
    $(this).attr('value') = $.trim(this).val();
    alert($(this).val()); //why no alert?
});

Answer 1

The $.trim is a function which needs a variable/string inside it, since you did not wrap $(this).val() with $.trim in order for it to work.

As you need a timeout for the paste to be caught, do it like this:

$("#adsense_client_id").bind('paste', function(e) {
    var clientId = $(this);
    setTimeout(function(){
        clientId.val($.trim(clientId.val()));
        alert(clientId.val());
    });
});

Demo.