Efficient way to write a jQuery if statement for multiple items

I have this form that is using da开发者_StackOverflow中文版ta-defaults and I need to be sure that they are cleared before submission. I have a jackhammer script that will do it, but I'm wondering if any of you would mind helping me finesse it.

The script below works and is perfectly fine if I want to write it for every input in the form (currently 8 with data defaults). I've tried selecting all of the inputs in the form with a few different approaches, but nothing seems to work. I imagine that there is a much smarter way to approach this than I am capable of, which is why I come here :)

$('#form_input_submit').click(function() {
    if ($('#specific_input_id').val() == $('#specific_input_id').attr('data-default')) {
      $('#specific_input_id').val('');
    }
    return true;
});

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This will check all the input elements that have a default data element and clear those fields before submitting.

$('#tour_submit').click(function() {
    $('input[data-default]').each(function(index) {
      if ($(this).val() == $(this).attr('data-default')) {
       $(this).val('');
      }
    });
});

---

You could get all the inputs in the form, and iterate over them. If some are radio or select inputs, we'll need to change it a little.

$('#form_input_submit').click(function() {
    $(this).closest('form').find('input').each(function() {
        if( this.value == $(this).attr('data-default') ) {
           this.value = '';
        }
    });
});

On the click of your form_input_submit button, it gets the .closest() ancestor <form>, and from there will .find() all the <input> elements.

Then it iterates over the collection using .each().

If $(this).attr('data-default') represents the initial value of the input as it came from the server (or in any manner from its initial state), you could do this instead:

    if( this.value == this.defaultValue ) {
       this.value = '';
    }

---

You can pass a function to .val(), simplifying your code down to this for all inputs:

$('#form_id').submit(function() {
   $(this).find('[data-default]').val(function(i, v) {
      return $(this).data('default') == v ? "" : v;
    });
});

Also, instead of attaching to the click event of a submit button, this listens to the submit event of the <form> itself.

---

Try giving the all the input items a class, then do this

$('#form_input_submit').click(function() {
    $('.inputs').each(function() {
       if ($(this).val() == $(this).attr('data-default')) {
          $(this).val('');
       }
    });
    return true;
});