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Moodle JavaScript Cookbook by Alastair Hole

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Adding a field that accepts only numeric characters

In this recipe, we will add a rule that accepts only numeric characters, that is, digits 0-9. This could be useful, for example, when the user is required to enter a reference number or a currency value.

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', 'mytext9', 'Numeric');
$mform->addRule('mytext9', 'Numeric', 'numeric', null, 'client');

When we test out this new rule by entering non-numeric characters (in this example, we entered the string abc), we see ...

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