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    GlobalEventHandlers.onmousemove

    概述

    onmousemove属性用来获取或设置当前元素的mousemove事件的事件处理函数.

    语法

    element.onmousemove = event handling code
    

    备注

    当用户在当前元素上移动鼠标时会触发mouseup事件.

    例子

    下面的例子演示了在显示"提示层"时onmousemove的用法.

    <!doctype html>
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>Tooltip Example</title>
    <script type="text/javascript">
    var oTooltip = new (function() {
      var nOverX, nOverY, nLeftPos, nTopPos, oNode, bOff = true;
      this.follow = function (oMsEvnt1) {
        if (bOff) { return; }
        var nMoveX =  oMsEvnt1.clientX, nMoveY =  oMsEvnt1.clientY;
        nLeftPos += nMoveX - nOverX; nTopPos += nMoveY - nOverY;
        oNode.style.left = nLeftPos + "px";
        oNode.style.top = nTopPos + "px";
        nOverX = nMoveX; nOverY = nMoveY;
      };
      this.remove = function () {
        if (bOff) { return; }
        bOff = true; document.body.removeChild(oNode);
      };
      this.append = function (oMsEvnt2, sTxtContent) {
        oNode.innerHTML = sTxtContent;
        if (bOff) { document.body.appendChild(oNode); bOff = false; }
        var nScrollX = document.documentElement.scrollLeft || document.body.scrollLeft, nScrollY = document.documentElement.scrollTop || document.body.scrollTop, nWidth = oNode.offsetWidth, nHeight = oNode.offsetHeight;
        nOverX = oMsEvnt2.clientX; nOverY = oMsEvnt2.clientY;
        nLeftPos = document.body.offsetWidth - nOverX - nScrollX > nWidth ? nOverX + nScrollX + 10 : document.body.offsetWidth - nWidth + 16;
        nTopPos = nOverY - nHeight > 6 ? nOverY + nScrollY - nHeight - 7 : nOverY + nScrollY + 20;
        oNode.style.left = nLeftPos + "px";
        oNode.style.top = nTopPos + "px";
      };
      this.init = function() {
        oNode = document.createElement("div");
        oNode.className = "tooltip";
        oNode.style.position = "absolute";
      };
    })();
    </script>
    <style type="text/css">
    div.tooltip {
      padding: 6px;
      background: #ffffff;
      border: 1px #76808C solid;
      border-radius: 5px;
      -moz-border-radius: 5px;
      -webkit-border-radius: 5px;
      z-index: 9999;
    }
    </style>
    </head>
    
    <body onload="oTooltip.init();">
    <p><a href="http://developer.mozilla.org/" onmouseover="oTooltip.append(event,'提示文字1');" onmousemove="oTooltip.follow(event);" onmouseout="oTooltip.remove();">将你的鼠标移动到这里&hellip;</a></p>
    <p><a href="http://developer.mozilla.org/" onmouseover="oTooltip.append(event,'提示文字2');" onmousemove="oTooltip.follow(event);" onmouseout="oTooltip.remove();">&hellip;或者这里!!</a></p>
    </body>
    </html>
    

    下面的例子演示了在进行拖拽操作时onmousemove的用法.

    <!doctype html>
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>Draggable objects</title>
    <script type="text/javascript">
    
    var bMouseUp = true, oDragging, nMouseX, nMouseY, nStartX, nStartY, nZFocus = 100 /* the highest z-Index present in your page plus 1 */;
    
    function dragDown(oPssEvt1) {
      var bExit = true, oMsEvent1 = oPssEvt1 || /* IE */ window.event;
      for (var iNode = oMsEvent1.target; iNode; iNode = iNode.parentNode) {
        if (iNode.className === "draggable") { bExit = false; oDragging = iNode; break; }
      }
      if (bExit) { return; }
      bMouseUp = false;
      nStartX = nStartY = 0;
      for (var iOffPar = oDragging; iOffPar; iOffPar = iOffPar.offsetParent) {
        nStartX += iOffPar.offsetLeft;
        nStartY += iOffPar.offsetTop;
      }
      nMouseX = oMsEvent1.clientX;
      nMouseY = oMsEvent1.clientY;
      oDragging.style.zIndex = nZFocus++;
      return false;
    }
    
    function dragMove(oPssEvt2) {
      if (bMouseUp) { return; }
      var oMsEvent2 = oPssEvt2 || /* IE */ window.event;
      oDragging.style.left = String(nStartX + oMsEvent2.clientX - nMouseX) + "px";
      oDragging.style.top = String(nStartY + oMsEvent2.clientY - nMouseY) + "px";
    }
    
    function dragUp() { bMouseUp = true; }
    
    document.onmousedown = dragDown;
    document.onmousemove = dragMove;
    document.onmouseup = dragUp;
    
    </script>
    <style type="text/css">
    .draggable {
      position: fixed;
      left: 0;
      top: 0;
      width: auto;
      height: auto;
      cursor: move;
    }
    
    #myDiv {
      width: 300px;
      height: 200px;
      left: 200px;
      top: 200px;
      background-color: #00ff00;
    }
    </style>
    </head>
    
    <body>
    
    <div class="draggable" id="myDiv"><p>一个 Hello world!</p></div>
    <div class="draggable" style="background-color:#aaaaaa;">又一个 hello world!</div>
    
    </body>
    </html>
    

    规范

    不属于任何公开的规范.

    文档标签和贡献者

    此页面的贡献者有: ziyunfei, khalid32, teoli
    最后编辑者: teoli,
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