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Passing Form textbox value as a global varibale to be used by multiple javascript function

I couldn't get it going.. I have input textbox, want to pass the value (userid) as a global varibale, so I can use them as a seed for my random function generator then I can use them in multiple javascripts function.

I am able to pass it as a local varible but couldn't get it out as global varible. Can you help?

<script type="text/javascript">

function seeduserid (form)
      {
            var seedvar = form.userid.value;
            //var mrnot = new MersenneTwister(seedvar);
            //alert (mrnot.random());
            //alert (seedvar);
            return(seedvar);
      }

      //var mrnot = new MersenneTwister(100)
      var mrnot = new MersenneTwister(seedvar)


      var x = mrnot.random()*451;;
      & other varibales and fuctions....

<SCRIPT>

<FORM action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" name="transForm">
<p> User ID: <INPUT TYPE="text" NAME="userid" id="userid" VALUE="" onblur="seeduserid(this.form)">
</FORM>

ASKER CERTIFIED SOLUTION

COBOLdinosaur

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Mike

ASKER

I understand it has to be outside the function, but what I want is the global variable update it selelf to the value returned form the function.

function seeduserid (form)
{
seedvar = form.userid.value;
//var mrnot = new MersenneTwister(seedvar);
//alert (mrnot.random());
//alert (seedvar);
return(seedvar);
}

var seedvar1 = seeduserid();

var mrnot = new MersenneTwister(seedvar1)

It still not settting the global variable "seedvar1" to "userid"

COBOLdinosaur

You are calling seeduserid with no parameter. That results in a null value being returned because form.userid.value is undefined.

Cd&

Mike

ASKER

what parameter I should call seeduserid with to make the "seedvar" as a global variable

COBOLdinosaur

It becomes a global by being created outside of any function. It mus exist before you reference it in a function.

the problem I was referring to was: var seedvar1 = seeduserid(); which cannot possibly return a value without a formname for a parameter.

The proper way to do it is to give the form an id and reference the id instead of this.form you could then use document.getElementById('idofform')

Cd&

Mike

ASKER

In March I have completed the task but forgot exactly how I did it now.

However, for this particular question, what COBOLdinosaur (Posted on 2012-03-21 at 14:57:54ID: 3774775) suggested "To be global he var must be declared outside of a function. " did work. Closing this question.

Mike

ASKER

Didn't get the exact answer that I needed but "To be global he var must be declared outside of a function." did help.