<input> tag validation for URL

Question

I am trying to validate an URL using JavaScript, but for some reason it's not working. When someone has not entered any URL, it shows message like:

Please enter valid URL.(i.e. http://)

I am trying to fix it, but can't make it working.

Is there any trick in HTML5 that allows to validate an URL?

$(document).ready(function() { 
$("#contactInfos").validate( 
 { onfocusout: false, rules: { 
       phone: { number:true }, 
       zipcode: { number:true }, 
       website: {    url:true    } 
 }, 
     messages: { phone: { number:"please enter digit only" }, 
     zipcode: { number:"Plese enter digit only"  }, 
     website: { url: "Please enter valid URL.(i.e. http://)"     } 
   } 

});

Validate method for an URL:

url: function(value, element) {
      values=value.split(',');
      for (x in values)
      {
          temp=values[x].trim();
  temp1=this.optional(element) || /^(https?|ftp):\/\/(((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:)*@)?(((\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5]))|((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?)(:\d*)?)(\/((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)+(\/(([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)*)*)?)?(\?((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)|[\uE000-\uF8FF]|\/|\?)*)?(\#((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)|\/|\?)*)?$/i.test(temp);

      if(temp1!=true)
      {
        return false;
      }
      }
       return true;
},

Answer 1

Does it make sense that the url is valid without a protocol?

For instance, currently http://google.com is a valid url, while google.com is not.

Similarly, http://localhost is a valid url, while localhost is not a valid url.

Answer 2

In html5 you can use the tag input type="url":

<input type="url" />

you can use your own pattern too:

<input type="url" pattern="https?://.+" required /> 

In the paper Uniform Resource Identifier (URI): Generic Syntax [RFC3986] http://www.ietf.org/rfc/rfc3986.txt the regular expression for a URI is:

^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?

For example, matching the above expression to

  http://www.ics.uci.edu/pub/ietf/uri/#Related

results in the following subexpression matches:

  $1 = http:
  $2 = http
  $3 = //www.ics.uci.edu
  $4 = www.ics.uci.edu
  $5 = /pub/ietf/uri/
  $6 = <undefined>
  $7 = <undefined>
  $8 = #Related
  $9 = Related