Solved

JavaScript calculator

Posted on 2014-04-28
3
206 Views
Last Modified: 2014-04-28
Hi guys, I'm stuck with one of my web assignments. I was asked to do a website for kids with mathematical functions like adding, subtracting, multiplying etc and I am stuck with times tables. I have JS in an external file, and I know that there is a way of doing this with a for loop, but I just simply don't get it, and I'm ending up with lines and lines of code for each number.

JavaScript

var TimesTables = function()
{
	var a = parseInt( $("a").value );
	var b = parseInt( $("b").value );

	if (isNaN (a) || isNaN (b) )
	{
		alert("Sorry you have to enter an integer value between 1 and 20:");
	}
	else 
	{
		$("a1").value = a + " x 1 = " + (a * 1);
		$("a2").value = a + " x 2 = " + (a * 2);
		$("a3").value = a + " x 3 = " + (a * 3);
		$("a4").value = a + " x 4 = " + (a * 4);
		$("a5").value = a + " x 5 = " + (a * 5);
		$("a6").value = a + " x 6 = " + (a * 6);
		$("a7").value = a + " x 7 = " + (a * 7);
		$("a8").value = a + " x 8 = " + (a * 8);
		$("a9").value = a + " x 9 = " + (a * 9);
		$("a10").value = a + " x 10 = " + (a * 10);
		$("a11").value = a + " x 11 = " + (a * 11);
		$("a12").value = a + " x 12 = " + (a * 12);
		$("a13").value = a + " x 13 = " + (a * 13);
		$("a14").value = a + " x 14 = " + (a * 14);
		$("a15").value = a + " x 15 = " + (a * 15);
		$("a16").value = a + " x 16 = " + (a * 16);
		$("a17").value = a + " x 17 = " + (a * 17);
		$("a18").value = a + " x 18 = " + (a * 18);
		$("a19").value = a + " x 19 = " + (a * 19);
		$("a20").value = a + " x 20 = " + (a * 20);
			
		$("b1").value = b + " x 1 = " + (b * 1);
		$("b2").value = b + " x 2 = " + (b * 2);
		$("b3").value = b + " x 3 = " + (b * 3);
		$("b4").value = b + " x 4 = " + (b * 4);
		$("b5").value = b + " x 5 = " + (b * 5);
		$("b6").value = b + " x 6 = " + (b * 6);
		$("b7").value = b + " x 7 = " + (b * 7);
		$("b8").value = b + " x 8 = " + (b * 8);
		$("b9").value = b + " x 9 = " + (b * 9);
		$("b10").value = b + " x 10 = " + (b * 10);
		$("b11").value = b + " x 11 = " + (b * 11);
		$("b12").value = b + " x 12 = " + (b * 12);
		$("b13").value = b + " x 13 = " + (b * 13);
		$("b14").value = b + " x 14 = " + (b * 14);
		$("b15").value = b + " x 15 = " + (b * 15);
		$("b16").value = b + " x 16 = " + (b * 16);
		$("b17").value = b + " x 17 = " + (b * 17);
		$("b18").value = b + " x 18 = " + (b * 18);
		$("b19").value = b + " x 19 = " + (b * 19);
		$("b20").value = b + " x 20 = " + (b * 20);
	}
}

Open in new window


and html

<table  class="hiddenAB">
<tr>
<td>Value for a</td>
<td><input type = "text" id="a" /></td>
</tr>
<tr>
	<td>Value for b</td>
	<td><input type = "text" id="b" /></td>
</tr>
<tr>
	<td><input type="button" id="resettimestables" value="Reset Table" /></td>
	<td><input type="button" id="calculatetimestables" value="Create Table" /></td>
					
</tr>
</table>
<table  class="table1">
<tr>
	<th>Table a</th>
	<th>Table b</th>
</tr>
<tr>
	<td><input type = "text" id="a1" value="a x 1 = ?" disabled="disabled" /></td>
	<td><input type = "text" id="b1" value="b x 1 = ?" disabled="disabled" /></td>
</tr>
<tr>
        <td><input type = "text" id="a2" value="a x 2 = ?" disabled="disabled" /></td>
	<td><input type = "text" id="b2" value="b x 2 = ?" disabled="disabled" /></td>
</tr>
<tr>
	<td><input type = "text" id="a3" value="a x 3 = ?" disabled="disabled" /></td>
	<td><input type = "text" id="b3" value="b x 3 = ?" disabled="disabled" /></td>
</tr>
<tr>
	<td><input type = "text" id="a4" value="a x 4 = ?" disabled="disabled" /></td>
	<td><input type = "text" id="b4" value="b x 4 = ?" disabled="disabled" /></td>
</tr>
<tr>
	<td><input type = "text" id="a5" value="a x 5 = ?" disabled="disabled" /></td>
	<td><input type = "text" id="b5" value="b x 5 = ?" disabled="disabled" /></td>
</tr>
<tr>
	<td><input type = "text" id="a6" value="a x 6 = ?" disabled="disabled" /></td>
	<td><input type = "text" id="b6" value="b x 6 = ?" disabled="disabled" /></td>
</tr>
<tr>
	<td><input type = "text" id="a7" value="a x 7 = ?" disabled="disabled" /></td>
	<td><input type = "text" id="b7" value="b x 7 = ?" disabled="disabled" /></td>
</tr>
<tr>
	<td><input type = "text" id="a8" value="a x 8 = ?" disabled="disabled" /></td>
	<td><input type = "text" id="b8" value="b x 8 = ?" disabled="disabled" /></td>
</tr>
<tr>
	<td><input type = "text" id="a9" value="a x 9 = ?" disabled="disabled" /></td>
	<td><input type = "text" id="b9" value="b x 9 = ?" disabled="disabled" /></td>
</tr>
<tr>
	<td><input type = "text" id="a10" value="a x 10 = ?" disabled="disabled" /></td>
	<td><input type = "text" id="b10" value="b x 10 = ?" disabled="disabled" /></td>
</tr>
<tr>
	<td><input type = "text" id="a11" value="a x 11 = ?" disabled="disabled" /></td>
	<td><input type = "text" id="b11" value="b x 11 = ?" disabled="disabled" /></td>
</tr>
<tr>
	<td><input type = "text" id="a12" value="a x 12 = ?" disabled="disabled" /></td>
	<td><input type = "text" id="b12" value="b x 12 = ?" disabled="disabled" /></td>
</tr>
<tr>
	<td><input type = "text" id="a13" value="a x 13 = ?" disabled="disabled" /></td>
        <td><input type = "text" id="b13" value="b x 13 = ?" disabled="disabled" /></td>
</tr>
<tr>
	<td><input type = "text" id="a14" value="a x 14 = ?" disabled="disabled" /></td>
	<td><input type = "text" id="b14" value="b x 14 = ?" disabled="disabled" /></td>
</tr>
<tr>
	<td><input type = "text" id="a15" value="a x 15 = ?" disabled="disabled" /></td>
	<td><input type = "text" id="b15" value="b x 15 = ?" disabled="disabled" /></td>
</tr>
<tr>
	<td><input type = "text" id="a16" value="a x 16 = ?" disabled="disabled" /></td>
	<td><input type = "text" id="b16" value="b x 16 = ?" disabled="disabled" /></td>
</tr>
<tr>
	<td><input type = "text" id="a17" value="a x 17 = ?" disabled="disabled" /></td>
	<td><input type = "text" id="b17" value="b x 17 = ?" disabled="disabled" /></td>
</tr>
<tr>
	<td><input type = "text" id="a18" value="a x 18 = ?" disabled="disabled" /></td>
	<td><input type = "text" id="b18" value="b x 18 = ?" disabled="disabled" /></td>
</tr>
<tr>
	<td><input type = "text" id="a19" value="a x 19 = ?" disabled="disabled" /></td>
	<td><input type = "text" id="b19" value="b x 19 = ?" disabled="disabled" /></td>
</tr>
<tr>
	<td><input type = "text" id="a20" value="a x 20 = ?" disabled="disabled" /></td>
	<td><input type = "text" id="b20" value="b x 20 = ?" disabled="disabled" /></td>
</tr>
</table>

Open in new window

0
Comment
Question by:martatkacz
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 58

Expert Comment

by:Gary
ID: 40028524
Can you use jQuery?

http://jsfiddle.net/xJVWa/

HTML
<input type="text" name="val" id="val">
<input type="button" value="Click Me" id="process">
<div id="result">          
</div>

Open in new window


JavaScript
$("#process").click(function(){
    result=""
    for(c=1;c<21;c++){
     result+=$("#val").val() + " * " + c + " = " + $("#val").val()*c + "<br>"
    }
    $("#result").html(result)
})

Open in new window

0
 
LVL 58

Accepted Solution

by:
Gary earned 500 total points
ID: 40028534
Pure JS version

http://jsfiddle.net/xJVWa/1/

HTML
<input type="text" name="val" id="val">
<input type="button" value="Click Me" id="process" onclick="process()">
<div id="result">          
</div>

Open in new window


JavaScript
function process(){
    result="";
    startval=document.getElementById("val").value;
    for(c=1;c<21;c++){
     result+=startval + " * " + c + " = " + startval*c + "<br>"
    }
    document.getElementById("result").innerHTML=result;
}

Open in new window



jQuery not really needed - though it appears you are using some kind of framework...
0
 

Author Comment

by:martatkacz
ID: 40028564
I haven't used jquery, and we were asked for pure JavaScript
0

Featured Post

Why You Need a DevOps Toolchain

IT needs to deliver services with more agility and velocity. IT must roll out application features and innovations faster to keep up with customer demands, which is where a DevOps toolchain steps in. View the infographic to see why you need a DevOps toolchain.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Is your Office 365 signature not working the way you want it to? Are signature updates taking up too much of your time? Let's run through the most common problems that an IT administrator can encounter when dealing with Office 365 email signatures.
When crafting your “Why Us” page, there are a plethora of pitfalls to avoid. Follow these five tips, and you’ll be well on your way to creating an effective page.
The viewer will learn how to count occurrences of each item in an array.
HTML5 has deprecated a few of the older ways of showing media as well as offering up a new way to create games and animations. Audio, video, and canvas are just a few of the adjustments made between XHTML and HTML5. As we learned in our last micr…

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question