Take User input to perform calculation in javascript

Question

I have written this piece of code but it is not working. I want to use the value entered by user to perform following calculation...

function calculateBasic()
		{
			var uservalue = form.size.value;
			var powerForOrganic = Math.pow(uservalue,1.05);
			var effortForOrganic = 2.4 * power;
			var powerTdevOrganic = Math.pow(effortForOrganic,0.38);
			var tdevForOrganic =  2.5 * powerTdevOrganic;
			var averageStaffForOrganic = effortForOrganic / tdevForOrganic;
			var productivityLevelForOrganic = averageStaffForOrganic / effortForOrganic;
			alert( "Effort :" + effortForOrganic + "TDEV :" + tdevForOrganic + "Average Staff :" + averageStaffForOrganic + "Productivity :" + productivityLevelForOrganic);
			
		}

<input type="text" id="size" placeholder="Enter the size in KLOC">
<input type="button" id="enterInfo" Value="Submit"  onclick="calculateBasic(this.form);">

document.getElementById("size").value...

War10ck
– War10ck

2015-09-29 21:02:43 +00:00
Commented Sep 29, 2015 at 21:02 — War10ck
– War10ck, Commented Sep 29, 2015 at 21:02

Richard Hamilton · Accepted Answer · 2015-09-29 21:08:46Z

2

Your line should be

var uservalue = document.getElementById("size").value;

power also wasn't defined. You probably meant powerForOrganic, which was defined the line before.

var effortForOrganic = 2.4 * powerForOrganic;

Here is the complete code

function calculateBasic() {
    var uservalue = Number(document.getElementById("size").value);
    var powerForOrganic = Number(Math.pow(uservalue,1.05));
    var effortForOrganic = Number(2.4 * powerForOrganic);
    var powerTdevOrganic = Number(Math.pow(effortForOrganic,0.38));
    var tdevForOrganic =  Number(2.5 * powerTdevOrganic);
    var averageStaffForOrganic = effortForOrganic / tdevForOrganic;
    var productivityLevelForOrganic = averageStaffForOrganic / effortForOrganic;
    alert( "Effort :" + effortForOrganic + "TDEV :" + tdevForOrganic + "Average Staff :" + averageStaffForOrganic + "Productivity :" + productivityLevelForOrganic);

    }

var button = document.getElementById("enterInfo");

button.addEventListener("click", function() {
    calculateBasic();
});

http://jsfiddle.net/739amacp/

edited Sep 29, 2015 at 21:08

answered Sep 29, 2015 at 21:03

Richard Hamilton

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1 Comment

Sebastian G. Marinescu Over a year ago

Also @M.Nabeel you have to change the html: onclick="calculateBasic();"

lusk · Accepted Answer · 2015-09-29 21:05:32Z

0

On line 4 you reference power when I believe you intended to reference powerForOrganic.

answered Sep 29, 2015 at 21:05

lusk

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Comments

Ananthaprakash · Accepted Answer · 2015-09-29 21:17:59Z

This reminds me the olden days of programming with javascript. It is still valid.

1) You are passing form as argument to the function, but the function doesn't get it. 2) some variable you are using inside the function is not declared or available. 3) If you are getting values of form as form..value, then you should give name for that element.

function calculateBasic(form)
		{
			var uservalue = (form.size.value);
			var powerForOrganic = Math.pow(uservalue,1.05);
			var effortForOrganic = 2.4 * powerForOrganic;
			var powerTdevOrganic = Math.pow(effortForOrganic,0.38);
			var tdevForOrganic =  2.5 * powerTdevOrganic;
			var averageStaffForOrganic = effortForOrganic / tdevForOrganic;
			var productivityLevelForOrganic = averageStaffForOrganic / effortForOrganic;
			alert( "Effort :" + effortForOrganic + "TDEV :" + tdevForOrganic + "Average Staff :" + averageStaffForOrganic + "Productivity :" + productivityLevelForOrganic);
			
		}

<form>
<input type="text" name="size" id="size" placeholder="Enter the size in KLOC">
<input type="button" id="enterInfo" Value="Submit"  onclick="calculateBasic(this.form)">
    </form>

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