主要是因為IE裡的Marquee不具有通用性,在其它浏覽器下無法正常工作,故用JavaScript把它的功能重寫了一下,支援多浏覽器! 其功能已封裝到Marquee.js中,支援無間斷滾動(預設),如果字幕區域裡的内容 長/寬 度 小于字幕區域設定的 長/寬 度 ,則預設不滾動! 支援動态更新滾動速度和方向!
Marquee.js參數說明:
demo 字幕區域标簽(div)的ID;
demo1/demo2 顯示内容标簽(div或td)的ID demo1為原始内容,demo2是它的拷貝;
direction 字幕方向(up,down,left,right) ;
delay 字幕播放的延遲時間(毫秒);
step 字幕播放的步長(即pix,步長越小,如step=1,滾動越平滑)
/***********************************************************************************************
obj__字幕區域標籤(div)的ID;
obj1__/obj2__顯示內容標籤(div或td)的ID obj1__為原始內容,obj2__是它的拷貝;
direction__字幕方向(up,down,left,right) ;
delay__字幕播放的延遲時間(毫秒);
step__字幕播放的步長(即pix,步長越小,如step__=1,滾動越平滑)
**************************************************************************************************/
function Marquee(obj__, obj1__, obj2__, direction__, delay__, step__) {
direction__ = direction__.toLowerCase();
if (((direction__ == "up" || direction__ == "down") && ($(obj1__).offsetHeight > $(obj__).offsetHeight)) || ((direction__ == "left" || direction__ == "right") && ($(obj1__).offsetWidth > $(obj__).offsetWidth))) {
$(obj2__).innerHTML = $(obj1__).innerHTML;
if (direction__ == "down")
$(obj__).scrollTop = 2 * $(obj1__).offsetHeight - $(obj__).offsetHeight;
if (direction__ == "right")
$(obj__).scrollLeft = 2 * $(obj1__).offsetWidth - $(obj__).offsetWidth;
}
else
return;
var flag = true;
var speed = delay__ == null ? 1 : parseInt(delay__);
var amount = step__ == null ? 1 : parseInt(step__);
var Marquee = function() {
switch (direction__) {
case "up":
if ($(obj2__).offsetTop - $(obj__).scrollTop <= 0)
$(obj__).scrollTop -= $(obj1__).offsetHeight;
else
$(obj__).scrollTop += amount;
break;
case "down":
if ($(obj1__).offsetTop - $(obj__).scrollTop >= 0)
$(obj__).scrollTop += $(obj2__).offsetHeight;
$(obj__).scrollTop -= amount;
case "left":
if ($(obj2__).offsetWidth - $(obj__).scrollLeft <= 0)
$(obj__).scrollLeft -= $(obj1__).offsetWidth;
$(obj__).scrollLeft += amount;
case "right":
if ($(obj__).scrollLeft <= 0)
$(obj__).scrollLeft += $(obj2__).offsetWidth;
$(obj__).scrollLeft -= amount;
default: break;
}
var timer = setInterval(Marquee, speed);
var play = function() {
if (flag) {
clearInterval(timer);
timer = setInterval(Marquee, speed);
$(obj__).onmouseover = function() {
if (flag)
$(obj__).onmouseout = function() {
this.delay__ = function(s) {
speed = s == null ? 50 : parseInt(s);
play();
this.step__ = function(s) {
amount = s == null ? 1 : parseInt(s);
this.start = function() {
if (!flag) {
flag = true;
play();
this.stop = function() {
flag = false;
this.direction__ = function(s) {
s = s.toLowerCase();
if (s == direction__)
return;
if (s == "down" && direction__ == "up")
direction__ = s;
if (s == "up" && direction__ == "down")
if (s == "right" && direction__ == "left")
if (s == "left" && direction__ == "right")
}
上面js裡用到的$或$F,如果你用過prototype.js的話,把它添加進去就行了; 否則你需要先引用下面的js檔案: Ruby.js (從prototype.js裡截過來的 呵呵)
function Ruby() {
}
if (!Array.prototype.push) {
Array.prototype.push = function() {
var startLength = this.length;
for (var i = 0; i < arguments.length; i++)
this[startLength + i] = arguments[i];
return this.length;
$ = function() {
var elements = new Array();
for (var i = 0; i < arguments.length; i++) {
var element = arguments[i];
if (typeof element == 'string')
element = document.getElementById(element);
if (arguments.length == 1)
return element;
elements.push(element);
return elements;
$F = function() {
if (arguments.length == 1)
return document.getElementById(arguments[0]).value;
else {
var elements = new Array();
for (var i = 0; i < arguments.length; i++) {
elements.push(document.getElementById(arguments[i]).value);
return elements;
到這裡,js檔案已經搞定了,開始寫HTML代碼:(1)先添加css樣式,如果你不想滾動字幕裡的内容被無故撐大的話(有時候)
<style>
.wrap{word-break:break-all;overflow:hidden}
</style>
(2)添加js檔案 -->用了prototype.js的更好,替換掉Ruby.js :)
<script src="Ruby.js"></script>
<script src="Marquee.js"></script>
(3)添加字幕區域内容
1. 向上或向下滾動
<div id="d1" style="overflow:hidden;height:200px;width:90px">
<div id="d11" width="100%" class="wrap">
=頂部=<br>動感地帶資費攻略1 動感地帶資費攻略2<br>=底部=
</div>
<div id="d12" width="100%" class="wrap"></div>
</div>
<script>var obj1 = new Marquee("d1","d11","d12","up");</script>
由于字幕d1的height=200,而d11的内容高度不足200,故字幕預設不會滾動,要實作滾動的話,隻需d11的height>200就行了,故隻需在d11的裡面再放個空div就行了,讓它的height=200; 如果d11的内容高度大于了200px,則字幕區域d1将無間斷滾動
2. 向左或向右滾動
<div id="d2" style="overflow:hidden;width:500">
<table>
<tr>
<td id="d21">
<nobr>
[開始]動感地帶資費攻略1 動感地帶資費攻略2 動感地帶資費攻略3 動感地帶資費攻略4 動感地帶資費攻略5 動感地帶資費攻略6 動感地帶資費攻略7 動感地帶資費攻略8 動感地帶資費攻略9 動感地帶資費攻略10 動感地帶資費攻略11 動感地帶資費攻略12 動感地帶資費攻略13 動感地帶資費攻略14 動感地帶資費攻略15 動感地帶資費攻略16 動感地帶資費攻略17 動感地帶資費攻略18 動感地帶資費攻略19 動感地帶資費攻略20[結束]
</nobr>
</td>
<td id="d22"></td>
</tr>
</table>
</div>
<script>var obj2 = new Marquee("d2","d21","d22","left");</script>
實作原理同上,至于為什麼這裡要用table而不用div,是因為div在預設情況隻能判斷height,而不能判斷width,而table卻恰恰相反,上面用到的nobr标簽也是必需的,防止字幕自動換行!
附: 更改延遲播放速度 obj2.delay(50); 或 obj2.delay("50");
更改播放步長 obj2.step(50); 或 obj2.step("50");
停止播放 obj2.stop(); 繼續播放 obj2.start();
更改播放方向(同類型方向) obj2.direction("right");