even listener of javascript converting radio button to input button

Question

1.00/5 (1 vote)

See more:

Below is JavaScript which creates a polygon or line depending on the radio button selected.

I want to convert my code as such that instead of radio button, I can execute function using simple input button. Do I have to write seperate event listeners for both buttons?

If so, how will I call them in HTML? Or will one event listener do just fine? How will the events be handled then?

function onPageLoaded()
{
canvas.addEventListener("click", onCanvasClick, false);
setInterval(updateScreen, 100);
}

function onCanvasClick(e)
{
var x = e.clientX-canvas.offsetLeft;
var y = e.clientY-canvas.offsetTop;

switch (byId('shapeType').value)
{
case 'poly': polyClick(x,y);
break;
case 'line': lineClick(x,y);
break;
}
}
Instead of this

<select id='shapeType'>
<option value="poly" selected>Polygon</option>
<option value="line">Line</option>
</select>
I want to use this

<input type="button" value="Add polygon">
<input type="button" value="Add line">
For full code u can see the solution of this thread http://www.codeproject.com/Answers/693319/unable-to-draw-more-then-1-shape-on-html5-canvas#answer1

Posted 9-Dec-13 12:23pm

mughees ilyas

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

mughees ilyas · Answer 1 · 2013-12-09T17:20:00

well here is the solution. Add a common class to the buttons and then write up the code for the same.

HTML

<input type="button" value="Add polygon" class="draw" data-type="poly">
<input type="button" value="Add line" class="draw" data-type="line">
JS

function onPageLoaded() {
var buttons = document.getElementsByClassName('draw');
for(var i=0;i < buttons.length; i++) {
buttons[i].addEventListener("click", onButtonClick, false);
}
setInterval(updateScreen, 100);
}

function onCanvasClick(e) {
var x = e.clientX-canvas.offsetLeft;
var y = e.clientY-canvas.offsetTop;

switch (this.getAttribute("data-type")) {
case 'poly': polyClick(x,y);
break;
case 'line': lineClick(x,y);
break;
}
}

Peter Leow · Answer 2 · 2013-12-09T17:42:00

Modify the code in unable to draw more then 1 shape on html5 canvas[^] as follows:

XML

var shapeType = 'poly';

.....

function onCanvasClick(e)
{
...
    //switch (byId('shapeType').value)
    switch (shapeType)
...
}

.....

// called whenever the screen needs updating
function updateScreen()
{
...
    //switch (byId('shapeType').value)
    switch (shapeType)
...

}

....

<input type="button" value="Add polygon" onclick="shapeType='poly';">
<input type="button"  value="Add line"  onclick="shapeType='line';">
<!--
<select id='shapeType'>
    <option value="poly" selected>Polygon</option>
    <option value="line">Line</option>
</select>
-->

even listener of javascript converting radio button to input button

2 solutions

Solution 1

Solution 2

Add your solution here

Preview 0