I know the scrollBy functions but is it possible to scroll down a web page with a command typed in the JavaScript console, so that the page automatically scrolls with the passed parameters?
Typing the function
function pageScroll() {
window.scrollBy(0,50); // horizontal and vertical scroll increments
scrolldelay = setTimeout('pageScroll()',100); // scrolls every 100 milliseconds
}
and then calling it does nothing in Chrome.
Give this a try; I use it myself often.
(function() {
var intervalObj = null;
var retry = 0;
var clickHandler = function() {
console.log("Clicked; stopping autoscroll");
clearInterval(intervalObj);
document.body.removeEventListener("click", clickHandler);
}
function scrollDown() {
var scrollHeight = document.body.scrollHeight,
scrollTop = document.body.scrollTop,
innerHeight = window.innerHeight,
difference = (scrollHeight - scrollTop) - innerHeight
if (difference > 0) {
window.scrollBy(0, difference);
if (retry > 0) {
retry = 0;
}
console.log("scrolling down more");
} else {
if (retry >= 3) {
console.log("reached bottom of page; stopping");
clearInterval(intervalObj);
document.body.removeEventListener("click", clickHandler);
} else {
console.log("[apparenty] hit bottom of page; retrying: " + (retry + 1));
retry++;
}
}
}
document.body.addEventListener("click", clickHandler);
intervalObj = setInterval(scrollDown, 1000);
})()
It might show you an error "too much recursion"
You should try setInterval()
instead of setTimeout()
. Check this sample code for that.
setInterval(function(){
window.scrollBy(0,50);
},100);
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