How I Can Change Image On Canvas ?

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plz tell me how i can change the image on canvass, i have 2 canvas on a single webpage, how i change the image on clicking the button . both canvas fill with image ????

Posted 6-Apr-14 4:28am

Member 10542187

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 6-Apr-14 11:04am

What have you tried?

Member 10542187 6-Apr-14 11:15am

i have tried this but i can`t understnd where i put the code related to change image ??????????

<!DOCTYPE HTML>
<html>
<head>
</head>
<body>
<canvas id="myCanvas" width="578" height="400" aign ="left" style="border:1px solid #d3d3d3;"></canvas>
<canvas id="myCanvas1" width="578" height="400" align="right" style="border:1px solid #d3d3d3;"></canvas>

<script>
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
var imageObj = new Image();
var canvas = document.getElementById('myCanvas1');
var context1 = canvas.getContext('2d');
var imageObj1 = new Image();

imageObj.onload = function() {
context.drawImage(imageObj, 69, 50);
context1.drawImage(imageObj1, 69, 50);

};
imageObj.src = 'images/a.jpg';
imageObj1.src = 'images/b.jpg';

</script>
</body>
</html>

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 6-Apr-14 11:18am

Write one button click event and write inside that for changing the image.

Member 10542187 6-Apr-14 11:22am

what i write inside that button ???
any function ???

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 6-Apr-14 11:55am

Add one click event for the button like...

<input type="button" id="btnSomeId" onclick="someFunction()" />

Inside the function do what you wish.

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Paulo Augusto Kunzel · Answer 1 · 2014-04-10T04:57:00

Hi
It seems that this code was patch together from pieces of code. You are calling var canvas twice and are try to print images all together. If you want to better understand how things work, please have a look at:
http://www.w3schools.com/html/html5_canvas.asp[^]
http://www.w3schools.com/js/js_functions.asp[^]
Start from the basic and work your way up.

However, if you feel like you can do this starting from half way, have a look on this Tip/Trick
Image Sliding Effect with JavaScript[^] and adapt it to clicking instead of the timer. If it looks to difficult to do it, then maybe you should look and practice at the first 2 links.

Good Luck

Regards