Difference between #4 and #10 of
How to implement form events

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Title unchanged

How to implement form events

Category unchanged

How-tos

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yii2, forms, how to

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[...]
$this->registerJs($js);
```

And thats it... hope you find it useful. Its a bit confusing at first when you do not know what has just happened.

**NOTE:**
 
You can prevent the form from being submitted by returning false. Returning either true, null or undefined will cause the form to be submitted. See below:
 
 
 
```php 
$js = <<<JS
 
$('body').on('beforeSubmit', 'form#{$model->formName()}', function () {
 
 
    var form = $(this);
 
 
    if (form.find('.has-error').length) {
 
        return false;
 
    }
 
    
 
    // return undefined; // form gets submitted
 
    // return null; // form gets submitted
 
    // return true; // form gets submitted
 
    return false; // form does not get submitted
 
 
});
 
JS;
 
 
$this->registerJs($js);
 
 
```
 
 
When using `return false` to prevent submission, there is no need to use ` e.preventDefault()` on the `submit` event:
 
 
 
```php 
<?php
 
$js = <<<JS
 
// get the form id and set the event
 
$('form#{$model->formName()}').on('beforeSubmit', function(e) {
 
    // return false to prevent submission
 
    return false;
 
}).on('submit', function(e){    // can be omitted
 
    e.preventDefault();         // can be omitted
 
});
 
JS;
 
 
 
$this->registerJs($js);
 
 
```
 
 
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Viewed: 39 501 times
Version: 2.0
Category: How-tos
Tags: Forms, How to, yii2
Written by: Antonio Ramirez
Last updated by: deacs
Created on: Sep 12, 2014
Last updated: 9 years ago
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