...

View Full Version : Need help with javascript scroller looping



rhomboid5
12-08-2007, 09:09 PM
Hello everyone, any help you can give with my issue is greatly appreciated. I have the following code that horizontally scrolls a set of 9 "blocks" from left to right in succession. It works exactly as I would like, except for the fact that it continually loops through. I would like for it to stop once the last "block" is rendered. Thanks again for your help!


// ***** Set up the blocks that will scroll through
var scroll1 = new scrollObject("scr1", 440, 50, "right", 2750, 1.15);
scroll1.block[0] = "Text in block 1";
scroll1.block[1] = "Text in block 2";
scroll1.block[2] = "Text in block 3";
scroll1.block[3] = "Text in block 4";
scroll1.block[4] = "Text in block 5";
scroll1.block[5] = "Text in block 6";
scroll1.block[6] = "Text in block 7";
scroll1.block[7] = "Text in block 8";
scroll1.block[8] = "Text in block 9";

window.onload = function() {
scroll1.scroll();
scroll2.scroll();
}

function scrollObject(main, width, height, direct, pause, speed) {
var self = this;
this.main = main;
this.width = width;
this.height = height;
this.direct = direct;
this.pause = pause;
this.speed = Math.max(1.001, Math.min((direct == "up" || direct == "down") ? height : width, speed));
this.block = new Array();
this.blockprev = this.offset = 0;
this.blockcurr = 1;
this.mouse = false;
this.scroll = function() {
if (!document.getElementById) return false;
this.main = document.getElementById(this.main);
while (this.main.firstChild) this.main.removeChild(this.main.firstChild);
this.main.style.overflow = "hidden";
this.main.style.position = "relative";
this.main.style.width = this.width + "px";
this.main.style.height = this.height + "px";
var x=0;
for (x = 0; x < 9; x++) {
var table = document.createElement('table');
table.cellPadding = table.cellSpacing = table.border = "0";
table.style.position = "absolute";
table.style.left = table.style.top = "0px";
table.style.width = this.width + "px";
table.style.height = this.height + "px";
table.style.overflow = table.style.visibility = "hidden";
var tbody = document.createElement('tbody');
var tr = document.createElement('tr');
var td = document.createElement('td');
td.innerHTML = this.block[x];
tr.appendChild(td);
tbody.appendChild(tr);
table.appendChild(tbody);
this.main.appendChild(this.block[x] = table);
}
if (this.block.length > 1) {
this.main.onmouseover = function() { self.mouse = true; }
this.main.onmouseout = function() { self.mouse = false; }
setInterval(function() {
if (!self.offset && self.scrollLoop()) self.block[self.blockcurr].style.visibility = "visible";
}, this.pause);
} this.block[this.blockprev].style.visibility = "visible";
}
this.scrollLoop = function() {
if (!this.offset) {
if (this.mouse) return false;
this.offset = (this.direct == "up" || this.direct == "down") ? this.height : this.width;
} else this.offset = Math.floor(this.offset / this.speed);
if (this.direct == "up" || this.direct == "down") {
this.block[this.blockcurr].style.top = ((this.direct == "up") ? this.offset : -this.offset) + "px";
this.block[this.blockprev].style.top = ((this.direct == "up") ? this.offset - this.height : this.height - this.offset) + "px";
} else {
this.block[this.blockcurr].style.left = ((this.direct == "left") ? this.offset : -this.offset) + "px";
this.block[this.blockprev].style.left = ((this.direct == "left") ? this.offset - this.width : this.width - this.offset) + "px";
}
if (!this.offset) {
this.block[this.blockprev].style.visibility = "hidden";
this.blockprev = this.blockcurr;
if (++this.blockcurr >= this.block.length) this.blockcurr = 0;
} else setTimeout(function() { self.scrollLoop(); }, 30);
return true;
}
}

rnd me
12-08-2007, 09:36 PM
kill off the code below that re-schedules the loop


setInterval(function() {
if (!self.offset && self.scrollLoop()) self.block[self.blockcurr].style.visibility = "visible";
}, this.pause);

rhomboid5
12-08-2007, 10:04 PM
rnd me, thanks for your input. I tried what you recommended, but that prevented the scrolling altogether. It renders the first "block", but does not scroll.

Trinithis
12-08-2007, 10:36 PM
Here's a quick and cheap fix (new code highlighted):


var intervalCount = 0;
var interval = setInterval(function() {
if(++intervalCount == scroll1.block.length - 1) clearTimeout(interval);
if (!self.offset && self.scrollLoop()) self.block[self.blockcurr].style.visibility = "visible";
}, this.pause);

rhomboid5
12-08-2007, 10:44 PM
Hello Trinithis, thanks very much for your help. That did the trick. Much appreciated! Have a good weekend.



EZ Archive Ads Plugin for vBulletin Copyright 2006 Computer Help Forum