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how to validate the phone number in form field xml

how to check the phone number field in joomla

<field
        name="mobileno"
        type="tel"
        description="mobileno"
        label="Mobileno"
        pattern="[0-9]{10}" 
        required="true"
        size="30"  
    />

There are some ready made validations available including telephone validation. You just have to add validate="tel" in your xml file.

<field
        name="mobileno"
        type="tel"
        description="mobileno"
        label="Mobileno"
        validate="tel" 
        required="true"
        size="30"  
    />

Reference: Validation rules

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