This page demonstrates how to use the JavaScript scrollBy and setTimeout methods to make a web page scroll down automatically. Change the timeout value to alter the scrolling speed in milliseconds. The example function below (arbitrarily calledpageScroll) shows how this can work:
function pageScroll() {
window.scrollBy(0,50); // horizontal and vertical scroll increments
scrolldelay = setTimeout('pageScroll()',100); // scrolls every 100 milliseconds
}To being scrolling automatically when the page loads, add the following code to the body tag:
<body onLoad="pageScroll()">To begin scrolling when prompted by the user, call the function from a link or button:
Text Link
<a href="javascript:pageScroll()">Scroll Page</a>Scroll Page
Button
<input type="button" onClick="pageScroll()" value="Scroll Page">Stop Scrolling
The pageScroll() function causes the page to keep scrolling forever. The following function will stop the scrolling, and can be called in the same way:
function stopScroll() {
clearTimeout(scrolldelay);
}
<a href="javascript:stopScroll()">Stop Scrolling</a>Stop Scroll
Scroll Directly to a Particular Point
Use the scroll() method to jump to a particular point on the page. The target position is specified in pixels from the top left corner of the page, horizontally and vertically.
function jumpScroll() {
window.scroll(0,150); // horizontal and vertical scroll targets
}
<a href="javascript:jumpScroll()">Jump to another place on the page</a>Jump to another place on the page
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