Help with javascript

chrismcl · 07-12-2010, 08:11 PM

Hi there folks,

I am kind of new to javascript and can't seem to get what I am wanting. Basically here is the code I have so far.

Code:

<script language="javascript">
                function addNumbers()
                {
                        var val1 = parseInt(document.getElementById("yourspy").value);
                        var val2 = parseInt(document.getElementById("numspy").value);
                        var val3 = parseInt(document.getElementById("enmyspypr").value);
                        var ansA = document.getElementById("answer1");
                        var ansB = document.getElementById("answer2");
                        var ansC = document.getElementById("answer3");
                        var ansD = document.getElementById("answer4");
                        ansA.value = val1 / val2;
                        ansB.value = val3 * 0.7;
                        ansC.value = val3 * 0.7 + val3;
                        ansD.value = val3 * 0.7 + ansA;
                }
        </script>

The problem I am having seems to be that ansA is not able to be used other that displaying in a text area. Can anyone help me make ansA available for the formula to use? Many thanks in advance.

A1ien51 · 07-12-2010, 08:18 PM

Look at the difference between

document.getElementById("yourspy").value

and

document.getElementById("answer1")

Eric

chrismcl · 07-12-2010, 08:40 PM

Quote:

Originally Posted by A1ien51

Look at the difference between

document.getElementById("yourspy").value

and

document.getElementById("answer1")

Eric

Not getting you. Please bear in mind this is my first shot at javascript and only have the basics from what I can find on the net. Are you saying that I should put.value at the end of the answer1 line? Sorry for being such a noob.

chrismcl · 07-12-2010, 08:50 PM

sorry for the noobness. I get you now. It should be this yeah:

Code:

ansD.value = val3 * 0.7 + ansA.value;

tomws · 07-12-2010, 08:55 PM

A1ien51's answer was on-track, but perhaps slightly more cryptic than I would have been.

Look where you're defining ansA:

Code:

var ansA = document.getElementById("answer1");

Then answer: what is ansA?

It's an HTML element.

Now, look at where you use it next:

Code:

ansD.value = val3 * 0.7 + ansA;

This assignment doesn't make sense. Read it:
To the element ansD, assign a value of val3 * 0.7 + an HTML element.

See it now?

EDIT: Doh! You beat me in answering your own post!

chrismcl · 07-14-2010, 08:32 PM

Hey folks. I still can't get it to work right. Here is what I have just now:

Code:

<script language="javascript">
                function addNumbers()
                {
                        var val1 = parseInt(document.getElementById("yourspy").value);
                        var val2 = parseInt(document.getElementById("numspy").value);
                        var val3 = parseInt(document.getElementById("enmyspypr").value);
                        var ansA = document.getElementById("answer1");
                        var ansB = document.getElementById("answer2");
                        var ansC = document.getElementById("answer3");
                        var ansD = document.getElementById("answer4");
                        ansA.value = val1 / val2;
                        ansB.value = val3 * 0.7;
                        ansC.value = val3 * 0.7 + val3;
                        ansD.value = ansC.value / ansA.value;
                }
        </script>

The problem is ansC and ansD. ansC appears to do the first bit but then just put the 2 number together and not actually add them. I am like completely stuck. I am begining to hate javascript. I can't seem to get my head around it. any ideas?

tomws · 07-14-2010, 08:52 PM

The '+' operator is also the concatenation operation in addition (ha!) to being addition. Try this workaround and see if it does what you want:

Code:

ansC.value = val3 * 0.7 + val3 * 1;