20150722---点击按钮使指定的控件可见部分平移（JS）

前段代码：

    <div id="out"  style=" width:400px;overflow:hidden;">
        <div id="int" style="white-space:nowrap;width:800px;">
            <asp:Label ID="lblTable" runat="server" Text="Label"></asp:Label>
        </div>
    </div>  
    <label onmousedown="marqueeById('l'),ShowLbl('lblRight')" id="lblLeft" onmouseup="marqueeStop()" style="visibility: hidden">&lt;&lt;&lt;&lt;</label>

    <label onmousedown="marqueeById('r'),ShowLbl('lblLeft')" id="lblRight" onmouseup="marqueeStop()" style="visibility: hidden">&gt;&gt;&gt;&gt;</label>

注意：内层div宽度大于外层div，宽度的设定不仅局限于实际像素，也可使用百分比；js指向的的是外层div。外层div内部元素超出部分隐藏overflow:hidden，内层div的text不允许换行white-space:nowrap

后台：

        protected void Page_Load(object sender, EventArgs e)
        {
            ShowMenu(20);
        }
        private void ShowMenu(int m)
        {
            string strTable = "";
            for (int i = 0; i <= m; i++)
            {
                strTable += "<a href=\"# \" class=\"nav\" ><span>" + i + "</span></a>";
            }
            lblTable.Text = strTable;
        }

注意：自动生成的菜单栏；

JavaScript：

    var speed = 10; //数字越大速度越慢
    var getMoveId = document.getElementById("out");  //需要移动的控件ID
    var getIntId = document.getElementById("int");
    var getLeftId = document.getElementById("lblLeft");
    var getRightId = document.getElementById("lblRight");
    var myMark; //开关标记
    function marqueeById(direction) {
        direction == "r" ? moveRight() : moveLeft();
    }
    function marqueeStop() {
        clearInterval(myMark);
        if (getMoveId.scrollLeft == 0) {
            getLeftId.style.visibility = "hidden";
        }
        if (getMoveId.scrollLeft == (getIntId.offsetWidth - getMoveId.offsetWidth)) {
            getRightId.style.visibility = "hidden";
        }
    }
    function moveRight() {
        myMark = setInterval(function () { getMoveId.scrollLeft++ }, speed);
    }
    function moveLeft() {
        myMark = setInterval(function () { getMoveId.scrollLeft-- }, speed);
    }
    function ShowLbl(id) {
        var imgid = document.getElementById(id);
        if (imgid.style.visibility == "hidden") {
            imgid.style.visibility = "visible";
        }
    }
    function load() {
        if (getIntId.offsetWidth > getMoveId.offsetWidth) {
            getRightId.style.visibility = "visible";
        }
    }

 

效果展示：

点击右侧箭头：

点击左侧：