Javascript implements mouse frame selection operation instead of click selection

Javascript implements mouse frame selection operation instead of click selection_javascript skills

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Release： 2016-05-16 15:05:32

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The example in this article shares with you Javascript to implement mouse frame selection operation, which is not click selection. It is for your reference. The specific content is as follows

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Code:

<html> 
<head></head> 
<style> 
body{padding:100px;} 
.fileDiv{float:left;width:100px;height:100px;text-align:center;line-height:100px;font-size:12px;border:1px solid #ccc;margin-right:10px;margin-bottom:10px;} 
.seled{border:1px solid red;background-color:#D6DFF7;} 
</style> 
<script type="text/javascript">  
(function() { 
  document.onmousedown = function() { 
 
    var selList = []; 
    var fileNodes = document.getElementsByTagName("div"); 
    for ( var i = 0; i < fileNodes.length; i++) { 
      if (fileNodes[i].className.indexOf("fileDiv") != -1) { 
        fileNodes[i].className = "fileDiv"; 
        selList.push(fileNodes[i]); 
      } 
    } 
 
    var isSelect = true; 
    var evt = window.event || arguments[0]; 
    var startX = (evt.x || evt.clientX); 
    var startY = (evt.y || evt.clientY); 
    var selDiv = document.createElement("div"); 
    selDiv.style.cssText = "position:absolute;width:0px;height:0px;font-size:0px;margin:0px;padding:0px;border:1px dashed #0099FF;background-color:#C3D5ED;z-index:1000;filter:alpha(opacity:60);opacity:0.6;display:none;"; 
    selDiv.id = "selectDiv"; 
    document.body.appendChild(selDiv); 
 
    selDiv.style.left = startX + "px"; 
    selDiv.style.top = startY + "px"; 
 
    var _x = null; 
    var _y = null; 
    clearEventBubble(evt); 
 
    document.onmousemove = function() { 
      evt = window.event || arguments[0]; 
      if (isSelect) { 
        if (selDiv.style.display == "none") { 
          selDiv.style.display = ""; 
        } 
        _x = (evt.x || evt.clientX); 
        _y = (evt.y || evt.clientY); 
        selDiv.style.left = Math.min(_x, startX) + "px"; 
        selDiv.style.top = Math.min(_y, startY) + "px"; 
        selDiv.style.width = Math.abs(_x - startX) + "px"; 
        selDiv.style.height = Math.abs(_y - startY) + "px"; 
 
        // ---------------- 关键算法 ---------------------  
        var _l = selDiv.offsetLeft, _t = selDiv.offsetTop; 
        var _w = selDiv.offsetWidth, _h = selDiv.offsetHeight; 
        for ( var i = 0; i < selList.length; i++) { 
          var sl = selList[i].offsetWidth + selList[i].offsetLeft; 
          var st = selList[i].offsetHeight + selList[i].offsetTop; 
          if (sl > _l && st > _t && selList[i].offsetLeft < _l + _w && selList[i].offsetTop < _t + _h) { 
            if (selList[i].className.indexOf("seled") == -1) { 
              selList[i].className = selList[i].className + " seled"; 
            } 
          } else { 
            if (selList[i].className.indexOf("seled") != -1) { 
              selList[i].className = "fileDiv"; 
            } 
          } 
        } 
 
      } 
      clearEventBubble(evt); 
    } 
 
    document.onmouseup = function() { 
      isSelect = false; 
      if (selDiv) { 
        document.body.removeChild(selDiv); 
        showSelDiv(selList); 
      } 
      selList = null, _x = null, _y = null, selDiv = null, startX = null, startY = null, evt = null; 
    } 
  } 
})(); 
function clearEventBubble(evt) { 
  if (evt.stopPropagation) 
    evt.stopPropagation(); 
  else 
    evt.cancelBubble = true; 
  if (evt.preventDefault) 
    evt.preventDefault(); 
  else 
    evt.returnValue = false; 
} 
function showSelDiv(arr) { 
  var count = 0; 
  var selInfo = ""; 
  for ( var i = 0; i < arr.length; i++) { 
    if (arr[i].className.indexOf("seled") != -1) { 
      count++; 
      selInfo += arr[i].innerHTML + "\n"; 
    } 
  } 
  alert("共选择 " + count + " 个文件，分别是：\n" + selInfo); 
} 
</script> 
<body> 
  <div class="fileDiv">file1</div> 
  <div class="fileDiv">file2</div> 
  <div class="fileDiv">file3</div> 
  <div class="fileDiv">file4</div> 
  <div class="fileDiv">file5</div> 
  <div class="fileDiv">file6</div> 
  <div class="fileDiv">file7</div> 
  <div class="fileDiv">file8</div> 
  <div class="fileDiv">file9</div> 
 
</body> 
</html>

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