How do I apply webform validation in drupal 7? -

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i have webforms in drupal 7 website. want validate webform fields. webform contains phone field should accept numeric field , should contain 10 numbers only. there module or have code this.

use hook_form_alter() apply custom validation in drupal

create module e.g. mymodule

file mymodule.module

function mymodule_form_alter(&$form, &$form_state, $form_id) {     print $form_id;      if($form_id=='webform_client_form_1') //change webform id according webformid     {         $form['#validate'][]='mymodule_form_validate';         return $form;     } }  function mymodule_form_validate($form,&$form_state) {     //where "phone" field name of webform phone field     $phoneval = $form_state['values']['submitted']['phone'];      if($phoneval=='')     {         form_set_error('phone','please fill form field');     }     // use regular expression validate it.     // in above example have check if phonefield empty or not. }

if want more detail how use hook_form_alter() visit link http://www.codeinsects.com/drupal-hook-system-part-2.html


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