jQuery/Javascript function to clear all the fields of a form

Set the val to ""

function clear_form_elements(ele) {

        $(ele).find(':input').each(function() {
            switch(this.type) {
                case 'password':
                case 'select-multiple':
                case 'select-one':
                case 'text':
                case 'textarea':
                    $(this).val('');
                    break;
                case 'checkbox':
                case 'radio':
                    this.checked = false;
            }
        });

    }

<input onclick="clear_form_elements(this.form)" type="button" value="Clear All" />  
<input onclick="clear_form_elements('#example_1')" type="button" value="Clear Section 1" />
<input onclick="clear_form_elements('#example_2')" type="button" value="Clear Section 2" />
<input onclick="clear_form_elements('#example_3')" type="button" value="Clear Section 3" />

You could also try something like this:

  function clearForm(form) {

    // iterate over all of the inputs for the form

    // element that was passed in

    $(':input', form).each(function() {

      var type = this.type;

      var tag = this.tagName.toLowerCase(); // normalize case

      // it's ok to reset the value attr of text inputs,

      // password inputs, and textareas

      if (type == 'text' || type == 'password' || tag == 'textarea')

        this.value = "";

      // checkboxes and radios need to have their checked state cleared

      // but should *not* have their 'value' changed

      else if (type == 'checkbox' || type == 'radio')

        this.checked = false;

      // select elements need to have their 'selectedIndex' property set to -1

      // (this works for both single and multiple select elements)

      else if (tag == 'select')

        this.selectedIndex = -1;

    });

  };

More info he