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Moodle JavaScript Cookbook by Alastair Hole

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Adding a field length within in a specified range

In this recipe, we will learn how to add a rule to ensure the length of text entered falls into a specified range of numbers of characters. Again, this could be used to validate information, such as a telephone number whose length must fall in a particular range to be accepted.

Getting ready

Please refer to the first recipe in this chapter for details on how to prepare a QuickForm web form which is the basis of this recipe.

How to do it...

Add the following code to our form definition in validation_form.php just after the field definition:

$mform->addElement('text', 'mytext4', 'Length 3-5');
$mform->addRule('mytext4', 'Length 3-5', 'rangelength', array(3,5), 'client');

Now we can test this rule in ...

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