Validate only URL from certain host

This question has come up now and again. You can make a custom validator like so:


<input data-validation="url github_url" ... />

<script>
$.formUtils.addValidator({
  name : 'github_url',
  validatorFunction : function(value, $el, config, language, $form) {
    return value.indexOf('https://github.com/') == 0;
  },
  errorMessage : 'This is not an url to github',
});

$.validate();
</script>

You can also use a regular expression together with the custom validator:

http://jsbin.com/yopogoguje/edit?html,output

<form>
  <p>
    <strong>Github link:</strong> <br>
    <input type="text"
         data-validation="url custom"    
         data-validation-regexp="^(https|http)://www.github.com|https://github.com"
        data-validation-error-msg="Only github URL´s are allowed">
  </p>
  <p>
    <input type="submit">
  </p>
</form>

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery-form-validator/2.3.26/jquery.form-validator.min.js"></script>
<script>
  $.validate();
</script>

How ever, I think that the logic module should have a generic validator that checks that a values begins with a certain set of characters. The implementation could look something like:

<input 
   data-validation="url startsWith" 
   data-validation-starts-with="https://www.github.com/|https://github.com/"
   data-validation-error-msg="You can only enter github links" 
/>

<script>
  $.validate({
     modules: 'logic'
  });
</script>

victorjonsson / jQuery-Form-Validator

Validate only URL from certain host #449