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How can I execute a JavaScript function before the form submission handler is called?

I am trying to save an image using the following code.

function mymodule_user_page_form() {    $form = array();    $form['submit'] = array(     '#type' => 'submit',     '#value' => 'Save',     '#attributes' => array(       'id' => 'myid_save',                    ),     '#submit' => array('mymodule_save'),    );     return $form; }  function mymodule_save($form, &$form_state) {     $save = db_update('student',array('target' => 'import'))     ->fields(array('id_status' => '1'))     ->condition('stud-id', '101-03043', '=')     ->execute();    if ($save) {     drupal_set_message("Successfully saved.");   } }

The JavaScript file contains the following code.

$('#myid_save').on('click', function(e) {              myid_save_signature();   myid_save_photo();                });

In my case, the JavaScript functions aren’t called; the page refreshes before they are executed. I want to run those functions before mymodule_save() is called.

How can I achieve this?

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How can I execute a JavaScript function before the form submission handler is called?

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