Javascript melaksanakan operasi pemilihan bingkai tetikus dan bukannya kemahiran click selection

Javascript melaksanakan operasi pemilihan bingkai tetikus dan bukannya kemahiran click selection_javascript

WBOY

Lepaskan： 2016-05-16 15:05:32

asal

1622 orang telah melayarinya

Contoh dalam artikel ini berkongsi Javascript dengan anda untuk melaksanakan operasi pemilihan bingkai tetikus, yang bukan pemilihan klik Ia adalah untuk rujukan anda. Kandungan khusus adalah seperti berikut

Rendering:

Kod:

<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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