Javascript onclick increase img url

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I'm making a small program that displays the images from a website. How it would be possible to use the onclick event in such a way that each click will increase the number of url eg / images/P100_01.gif -> / images/P101_01.gif and print the image in HTML?

Posted 26-May-14 19:19pm

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Peter Leow · Answer 1 · 2014-05-26T20:21:00

Learn and adapt from the following example:

<!DOCTYPE html>
<html>
<body>
<p>Click to get next image</p>
<image src="/images/P100_01.gif" id="img">
<button type="button" onclick="getNextImage()">Get Image</button>
<script>
function getNextImage() {
// get the old image source
var oldImageSource = document.getElementById("img").src;
alert(oldImageSource);
// extract the '100'
var str = oldImageSource.slice(9,12);
// convert '100' to number
var oldNum = Number(str);
alert(oldNum);
// increase 100 by 1
var newNum = oldNum + 1;
alert(newNum);
// replace the old number in the old image source by the new one
var newImageSource = oldImageSource.replace(oldNum, newNum); 
alert(newImageSource);
}
</script>
</body>
</html>

Read more on JavaScript String Object[^]