Passing Data from a field to the function

The .value attribute

function MyFunction1()




	var w = parseInt(document.form1.field1.value,10);

	var x = parseInt(document.form1.field2.value,10);

	var y = parseInt(document.form1.field3.value,10);



	var z = w+x+y;


	document.form1.field4.value=z

		

// This is the code added for assignment 4

function MyFunction2()

	{

	if(document.form1.field4.value=="")

			{

			alert("The field is blank! We should do something about that!");

			/* This line was just for fun. 

			It puts a random number between 0 and 100 in the field. */

			document.form1.field4.value=(Math.floor(Math.random()*100));

			}

	}







<form  name="form1">

	Enter W:<input type = text name=field1>

	Enter X:<input type = text name=field2>

	Enter Y:<input type = text name=field3>

	Z = W+X+Y:<input type = text name=field4>

</form>