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我已经搜索，阅读和重新阅读。我什至将测试模块剥离为最基本的元素。

我认为这段代码应该可以工作，但永远不会调用验证回调。我将回调添加到表单中，但在接下来的步骤中它消失了。

最终，我的目标是“验证”提交的用户名，以满足特定的业务目标。我只是添加了表单验证回调，但我相信一旦克服了这个障碍，其余的功能就很简单了。

比我聪明的人可以指出正确的方向来正确添加验证回调吗？

<?php
/*
    Implements hook_form_alter();
*/
function mymod_form_alter($form, $form_state, $form_id) {
    // catch the user profile form.
    if('user_profile_form' == $form_id) {
        // set debug message
        drupal_set_message(t('adding validation callback in hook_form_alter()...'), 'warning');
        // add a validation callback
        $form['#validate'][] = 'mymod_user_profile_form_validate';
    }
}

/*
    Implements hook_form_<form_id>_alter();
    If mymod_form_alter() was successful, I wouldn't need this hook, it's just here for verification.
*/
function mymod_form_user_profile_form_alter($form, $form_state, $form_id) {
    // check to see if our validation callback is present
    if(!in_array('mymod_user_profile_form_validate', $form['#validate'])) {
        // our validatiation callback is not present
        drupal_set_message(t('The validation callback is missing from #validate in hook_form_[form_id]_alter()'), 'error');
        // since it's not there, try re-adding it?
        $form['#validate'][] = 'mymod_user_profile_form_validate';
    } else {
        // We should see this message, but don't.
        drupal_set_message(t('The validation callback exists!'), 'status');
    }
}

/*
    ?? Implements hook_form_validate(); (or not...) ??
*/
function mymod_user_profile_form_validate($form, $form_state) {
    // why is mymod_user_profile_form_validate() never called??
    drupal_set_message(t('Validation callback called! Whoopee! Success!'), 'status'); // This never happens!

    // if this was working, we would do a bit of logic here on the username.  
    //for this test, let's assume we want to return an error on the username field.
    form_set_error('name', t('Blah, blah, blah, something about your username...'));
}
4

1 回答 1

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The variables $form and $form_state should be passed by reference so that your hook function can actually modify them (otherwise the function just get a copy).

You need to use & (ampersand) symbol added before variable argument in the function signature : 

function mymod_form_alter(&$form, &$form_state, $form_id) {
  # $form is referenced from the global scope using '&' symbol
  $form['#validate'][] = 'mymod_user_profile_form_validate';
}
于 2019-09-23T11:03:00.640 回答