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    • Data Validation for HTML

    Validation

    If you’d like to limit the values that can be submitted or make certain fields required, you can add an attribute called data-validation to the input tag:

    <input type="text" name="vars[zip_code]" data-validation="required postalcode"/>
    Parameter Description Example Value
    phone Phone number 877 812 8689
    postalcode Postal code such as zip code 10010
    required Choose this if you want to require this field
    match-[field name] Forces the field to match another field
    url URL validation https://www.sailthru.com
    email Email address (turned on by defualt if the field is named ’email’) support@sailthru.com
    number Any number 42

    Error Messages

    If you’d like to show an error message when the user enters an invalid value or fails to enter a required field, you can put the error message inside of an html element and give that element an attribute called data-errormsg with the name of the invalid input as a value, like this:

    <input type="text" name="vars[first_name]" data-validation="required"/> 
<span data-errormsg="vars[first_name]">Tell us your first name</span>

    The error message element will only be visible if the the user fails to enter a valid value for the field in question.

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