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Moodle JavaScript Cookbook by Alastair Hole

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Adding a field that accepts only alphabetic characters

In this recipe, we will add a rule that forbids all characters except alphabetic characters, that is, it allows only letters a-z in upper or lower case.

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', 'mytext7', 'Letters only');
$mform->addRule('mytext7', 'Letters only', 'lettersonly', null, 'client');

When we test out this rule by entering numeric characters, our warning message is displayed and we are not able to submit the form as seen in the following ...

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