How to do I validate a textarea in a form in javascript

[Zayn]

<script>
    function val()
    {
      //ifnewline found or blank raise an alert
    } 
   </script>
   <form>  
   <textarea name = "pt_text" rows = "8" cols = "8" class = "input" WRAP ></textarea>
   <input type=""button" onclick="val();"
    </form>

[gits]

what exactly should it validate for? you can use the

indexOf-method

or

Regular Expression

for that purpose.

[AjayGohil]

try this script for textarea validation

 <form>  
   <textarea name = "pt_text" rows = "8" cols = "8" class = "details" WRAP ></textarea>
   <input type=""button" onclick="validate();"
    </form>

<script>
function validate()
{
     var obj1 = document.getElementById('details');
         if(trimTextarea(obj1.value) == '') 
         {      
              alert("Please Provide Details!");
              obj1.focus();
              return false;       
         }
}
 
function trimTextarea(str) 
{ 
    return str.replace(/^\s+|\s+$/g,''); 
}
</script>

[gits]

well - the OP didn't specify for what it should validate - so throwing out such code is just guesswork. besides that a much easier and much more performant way to test for an empty value in that field would make use of Javascript's typeconversion system. You would only need to check:

value == 0

this 'autocasts' the value to a number and it does exactly what your trimfunction does - but with much less expensive operations.

PS: you just cant put in only 0(s) here - but usually that is ok as well with the app logic.