Javascript / jQuery form validation

Question

Hey guys. I am currently using a very inefficient script to validate my forms. The code is massive.

The idea with this is if an input box is blank the input label is highlighted red and a div at the top of the form show's information on the error.

function new_receiver(){


if (document.getElementById("RecieversName").value ==""){ //First Name

        var txt=document.getElementById("error_receiver");
        txt.innerHTML="<p><font color=\"#FF0000\">You need to enter a Name!</font></p>";    
        window.document.getElementById("RecieversName_label").style.color = '#FF0000';

        //Reset
        window.document.getElementById("receiver_check_label").style.color = '#000000';
        window.document.getElementById("RecieversNumber_label").style.color = '#000000';
        window.document.getElementById("RecieversEmail_label").style.color = '#000000';

}else if (document.getElementById("RecieversNumber").value ==""){ //First Name

        var txt=document.getElementById("error_receiver");
        txt.innerHTML="<p><font color=\"#FF0000\">You need to enter a Phone Number!</font></p>";    
        window.document.getElementById("RecieversNumber_label").style.color = '#FF0000';

        //Reset
        window.document.getElementById("receiver_check_label").style.color = '#000000';
        window.document.getElementById("RecieversName_label").style.color = '#000000';
        window.document.getElementById("RecieversEmail_label").style.color = '#000000'

}else if (document.getElementById("RecieversNumber").value ==""){ //First Name

        var txt=document.getElementById("error_receiver");
        txt.innerHTML="<p><font color=\"#FF0000\">You need to enter an Email!</font></p>";  
        window.document.getElementById("RecieversEmail_label").style.color = '#FF0000';

        //Reset
        window.document.getElementById("receiver_check_label").style.color = '#000000';
        window.document.getElementById("RecieversName_label").style.color = '#000000';
        window.document.getElementById("RecieversNumber_label").style.color = '#000000';


}else{
from.receiver.submit();

}'

Any ideas or methods to making this process easy as some of my forms have up to 9 input boxes and this validation method is massive!

Cheers Guys!!!

Samuel.

Jeffery To · Accepted Answer · 2011-04-19 09:30:09Z

I suggest something like this:

function new_receiver() {
    var inputs = [
        {
            id: "RecieversName",
            name: "a Name"
        },
        {
            id: "RecieversNumber",
            name: "a Phone Number"
        }
        // add more here
    ],
    length = inputs.length,
    error = document.getElementById("error_receiver"),
    hasError = false,
    i;

    // reset
    for (i = 0; i < length; i++) {
        document.getElementById(inputs[i].id + "_label").style.color = "#000000";
    }
    error.innerHTML = "";

    for (i = 0; i < length; i++) {
        if (document.getElementById(inputs[i].id).value == "") {
            error.innerHTML = "<p><font color=\"#FF0000\">You need to enter " + inputs[i].name + "!</font></p>";    
            document.getElementById(inputs[i].id + "_label").style.color = "#FF0000";
            hasError = true;
            break;
        }
    }

    if (!hasError) {
        from.receiver.submit();
    }
}

Anupam · Accepted Answer · 2011-04-19 09:25:31Z

1

You can start by trying something like this

 $('input').blur(function() {
     if($(this).val()==""){
            $("#error_receiver").html("<p><font color=\"#FF0000\">This field is required!");
            $("label[for=' + this.attr("id") + ']").css('color', '#FF0000');
         }
  });

answered Apr 19, 2011 at 9:25

Anupam

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Comments

mplungjan · Accepted Answer · 2011-04-19 09:34:08Z

1

Here is a suggestion without jQuery

<form onsubmit="return new_receiver()">
.
.

var formFields = {
  "RecieversName": "You need to enter a Name!",
  "RecieversNumber":"You need to enter a Number!",
  "RecieversEmail":"You need to enter an Email!"   
}
function new_receiver(){
  var txt=document.getElementById("error_receiver");
  //Reset
  txt.innerHTML="";
  for (var o in formFields) document.getElementById(o+"_label").style.color = '#000000';

  for (var o in formFields) {
    if (document.getElementById(o).value ==""){ 
      txt.innerHTML="<p><font color=\"#FF0000\">"+formFields[o]+"</font></p>";    
      window.document.getElementById(o+"_label").style.color = '#FF0000';
      return false;
    }
  }
  return true
}

edited Apr 19, 2011 at 9:34

answered Apr 19, 2011 at 9:29

mplungjan

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Comments

Mahesh KP · Accepted Answer · 2011-04-19 09:08:20Z

0

you can use jquery validation plugin http://bassistance.de/jquery-plugins/jquery-plugin-validation/

answered Apr 19, 2011 at 9:08

Mahesh KP

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3 Comments

alex Over a year ago

It would require him to be using jQuery too, which it looks like he isn't.

Anupam Over a year ago

@alex He has mentioned jQuery in the title

Samuel Meddows Over a year ago

Cheers mahesh. I'm trying to avoid using more plug ins as I already have a head but that's still an excellent option for the future!

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