Question

How to check for comma separated values in a text box and raise an alert if not found?
And if there is it should be characters in it like A,B,C,D

  function validate()
   {
         //validate text box;
   }
  <input type="text" id="val" >A,B,C,D</input>
  <input type="button" id="save" onclick="validate()">  
 

Answer 1

I hope this will help you

function validate()
{
    val = document.getElementById('val').value;
    val = val.split(',');
    alert(val[0].length);
    for(var i=0;i<val.length;i++)
    {
        if(val[i].length != 1){
            alert("Please check value should be coma seperated at every single characters");
            return false;
        }
    }
    return true; 
}

HTML:

<input type="text" id="val" value = 'A,B,C,D' ></input>
<input type="button" id="save" onclick="return validate()">