Passing values from HTML form <---> JavaScript?

You could write the following:

function updatePhoneNo() {

document.formname.phone_no.value = "("+document.formname.areacode.value+")"+document.formname.prefix.value+"-"+document.formname.number.value;

}

The form would benefit by having a name and you would replace "formname" with what you set.

Then I would probably call this function with a "onChange" event for the input fields to update the phone_no field.

You might also want to look into validating the input like to see if they enter 2 numbers or 3 into the fields.

Aha, well basically you can call the values from JavaScript. Here 's a little code that will do the job :D

- note you'll have to add a <FORM> tag....

I putted the <FORM name="f1">

<script>

function getValue(inputName)

{

return f1.[inputName];

}

</script>

assume the form element has the id attribute of "bubbaField" like so <input type="text" id="bubbaField" /> the code to access it could go like this var myVariable = document.getElementById("bubbaField"); //(now myVariable refers to the text box) //to refer to what's in the text box, do this:) var theValue = myVariable.value; // plus many other ways to get the value magic

start by giving the elements id=" " attributes, give the same id as the name. then just call the following function it will take care of everything

function GrabPhoneNumber()

{

var areacode = document.document.getElementById("areacode").value;

var prefix = document.document.getElementById("prefix").value;

var number = document.document.getElementById("number").value;

var phone_no="("+areacode+") "+prefix+"-"+number;

document.document.getElementById("phone_no").value = phone_no

}

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I use PHP

Something like

$PhoneNumber= "$_POST['areacode']-$_POST['prefix']-$_POST['number']";