如何查看滚动条的状态是否在顶部或底部? [英] How to check the scroll bar status is already at top or at end?

问题描述

当用户设置"overflow:auto;"时显示滚动条.用户可以从上到下滚动内容.问题是，当滚动条位于底部还是顶部时，如何检查javascript/jquery?这样

The scroll bar is shown when user set "overflow:auto;" and the user can scroll things from top to bottom. The problem is , how can the javascript/jquery check when the scroll bar is either at the bottom or at the top? So that

if (is_scrollbar_top || is_scrollbar_end)
//do some thing..

那么有什么功能/方法可以检查这种状态?谢谢

So are there any funciton/ way to check such status? Thanks

更新:不起作用-使用jquery ui对话框

Updated: Not working- using jquery ui dialog

html:

<div class = "dialog" id="dialog" title="Past Issues"></div>

javascript:

$('#pastIssues').click(function (event) {
            var issueString = 'product=Headline&year=2012&month=12';
            $('.issues,#issuesBox').remove();
            var dWidth = $(window).width() * 0.9; 
            var dHeight = $(window).height() * 0.9;

            $( "#dialog" ).dialog({
                    height: dHeight,
                    width: dWidth,
                    modal: true,
                    draggable: false, 
                    resizable: false,
            });

            get_past_issues(issueString,2012,12,event.type);
            return false;
        }); 

推荐答案

HTML:

<div id="mydiv" style="overflow: auto; height: 500px"></div>

脚本:

$(document).ready(function()
{
    $("#mydiv").scroll(function()
    {
        var div = $(this);
        if (div[0].scrollHeight - div.scrollTop() == div.height())
        {
            alert("Reached the bottom!");
        }
        else if(div.scrollTop() == 0)
        {
            alert("Reached the top!");
        }
    });
});

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