在javascript中执行回发之前延迟

Delay before doing postback in javascript

本文关键字:延迟 javascript 执行      更新时间:2023-09-26

我现在唯一能想到的在3秒延迟的情况下进行回发的方法是这样的。

setInterval("__doPostBack('UpdatePanel1', '' )", 3000); 

我遇到的问题是,它每3秒钟就会发一次回。有没有更好的方法来做到这一点,或者有没有一种方法来清除间隔?我使用的是asp更新面板控件。

以下是我的完整javascript代码,让您了解我正在尝试做的事情:

    var delayb4scroll = 1000 //Specify initial delay before marquee starts to scroll on page (2000=2 seconds)
    var marqueespeed = 2 //Specify marquee scroll speed (larger is faster 1-10)
    var pauseAtBottom = 3000 //Pause at the end of the scroll for this many seconds (3000 = 3 seconds)
    var copyspeed = marqueespeed
    var actualheight = ''
    var boolRunOnce = ''
    function pageLoad() {
        initializemarquee();
    }
    function scrollmarquee() {
        if (parseInt(cross_marquee.style.top) - 975 > (actualheight * (-1) + 8)) //if scroller hasn't reached the end of its height
            cross_marquee.style.top = parseInt(cross_marquee.style.top) - copyspeed + "px" //move scroller upwards
        else { //else, scrollbar has reached the bottom, display for 3 seconds then postback
            setInterval("__doPostBack('UpdatePanel1', '' )", 3000);        
        }
    }
    function initializemarquee() {
        cross_marquee = document.getElementById("vmarquee")
        cross_marquee.style.top = 0
        marqueeheight = document.getElementById("marqueecontainer").offsetHeight
        actualheight = cross_marquee.offsetHeight //height of marquee content (much of which is hidden from view)       
        setTimeout('lefttime=setInterval("scrollmarquee()",30)', delayb4scroll)
    }
setTimeout(function() { __doPostBack('UpdatePanel1', '' ); }, 3000);

将只运行一次。

或者,您可以使用setInterval的返回值作为对间隔线程的引用,然后可以清除该线程;

myInterval = setInterval(function() { __doPostBack('UpdatePanel1', '' ); }, 3000);
//later
clearInterval(myInterval);

编辑:正确,根据注释添加函数语法。