Magento: Do some action after magento form validation

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In Magento, we are having default validation function called VarienForm, if we pass our form id it will validate the input fields based on the class we specified into it. Ex. required-entry, validate-email. If we want to do some action before submitting form, follow below code to catch the success action. 

    var dataForm = new VarienForm('reach-form-validate');
    $('reach_us_submit').observe('click', function(){
       if(dataForm.validator.validate()){
            jQuery('#reach_us_submit').attr('disabled','disabled');
            dataForm.form.submit();
        } else {
            jQuery('#reach_us_submit').removeAttr('disabled');
        }
    }.bind(dataForm));

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