IE11的Javascript问题

时间：2016-03-17 12:06:17

标签： javascript html internet-explorer cross-browser internet-explorer-11

我的应用程序工作正常，直到IE9，现在当我升级到IE11时它停止工作。这是一个示例html和js。

ISSUE

在第一次运行即。 正在加载它运作良好。但当我 选择 PDA品牌时，第二次下拉列表的所有选项都显示为空白。

在控制台中，对象Invalid Calling Object error上存在脚本错误clonedOptions。

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function dynamicSelect(id1, id2) {
  //alert("Everytime")
  // Browser and feature tests to see if there is enough W3C DOM support

  // Obtain references to both select boxes
  var sel1 = document.getElementById(id1);
  var sel2 = document.getElementById(id2);
  // Clone the dynamic select box
  var clone = sel2.cloneNode(true);
  // Obtain references to all cloned options
  var clonedOptions = clone.getElementsByTagName("option");
  // Onload init: call a generic function to display the related options in the dynamic select box
  refreshDynamicSelectOptions(sel1, sel2, clonedOptions);
  // Onchange of the main select box: call a generic function to display the related options in the dynamic select box

  sel1.onchange = function() {
    refreshDynamicSelectOptions(sel1, sel2, clonedOptions);
  };
}

function refreshDynamicSelectOptions(sel1, sel2, clonedOptions) {
  while (sel2.options.length) {
    sel2.remove(0);
  }

  //alert(sel1.options[sel1.selectedIndex].value)

  // Create regular expression objects for "select" and the value of the selected option of the main select box as class names
  var pattern1 = /( |^)(select)( |$)/;
  var pattern2 = new RegExp("( |^)(" + sel1.options[sel1.selectedIndex].value + ")( |$)");
  // Iterate through all cloned options
  //alert(clonedOptions.length);
  for (var i = 0; i < clonedOptions.length; i++) {
    // If the classname of a cloned option either equals "select" or equals the value of the selected option of the main select box

    if (clonedOptions[i].className.match(pattern1) || clonedOptions[i].className.match(pattern2)) {
      // Clone the option from the hidden option pool and append it to the dynamic select box
      //alert("Did match")

      sel2.appendChild(clonedOptions[i].cloneNode(true));
      //alert(sel2.options[1]);
    }
  }
}
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">

<head>
  <title>dynamic selectbox example</title>
  <script type="text/javascript" src="unobtrusivedynamicselect_ex5.js"></script>
</head>

<body>
  <form action="#">
    <div>
      <select id="pda-brand">
        <option value="select">Select PDA brand...</option>
        <option value="dell">Dell</option>
        <option value="hp">HP</option>
        <option value="palmone">PalmOne</option>
      </select>
      <select id="pda-type">
        <option class="select" value="select">Select PDA type...</option>
        <option class="dell" value="aximx30">Axim X30</option>
        <option class="dell" value="aximx50">Axim X50</option>
        <option class="hp" value="ipaqhx2750">iPAQ hx2750</option>
        <option class="hp" value="ipaqrx3715">iPAQ rx3715</option>
        <option class="hp" value="ipaqrz1710">iPAQ rz1710</option>
        <option class="palmone" value="tungstene2">Tungsten E2</option>
        <option class="palmone" value="tungstent5">Tungsten T5</option>
        <option class="palmone" value="zire72">Zire 72</option>
      </select>
      <script type="text/javascript">
        window.onload = function(e) {
          dynamicSelect("pda-brand", "pda-type");
        }
      </script>
    </div>
  </form>
</body>

</html>
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问题线

在下面的loc中，对于clonedOptions，我收到了无效的调用对象错误。

for (var i = 0; i < clonedOptions.length; i++) {

2 个答案:

答案 0 :(得分：1)

我认为问题在于您正在使用getElementsByTagName返回实时列表，这意味着如果从DOM中删除某个项目，它也会从列表中删除，因此有资格进行垃圾回收。见https://developer.mozilla.org/en-US/docs/Web/API/Element/getElementsByTagName

  

返回的列表是实时的，这意味着它会自动使用DOM树更新自己。

以下示例将解释我的意思

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var ps = document.body.getElementsByTagName('p');
var ps2 = document.body.querySelectorAll('p');
console.log(ps.length); // 3
document.body.removeChild(ps[0]);
console.log(ps.length);  // 2
console.log(ps2.length);  // 3
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<p>Hello</p>
<p>Hello</p>
<p>Hello</p>
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我没有最新的IE浏览器，但我强烈感觉如果您使用clone.querySelectorAll("option")，您将不会遇到同样的问题，因为这些节点不符合垃圾回收的条件因为它返回的列表不是实时的。

＆＃13;
＆＃13; 
function dynamicSelect(id1, id2) {
  //alert("Everytime")
  // Browser and feature tests to see if there is enough W3C DOM support

  // Obtain references to both select boxes
  var sel1 = document.getElementById(id1);
  var sel2 = document.getElementById(id2);
  // Clone the dynamic select box
  var clone = sel2.cloneNode(true);
  // Obtain references to all cloned options
  var clonedOptions = clone.querySelectorAll("option");
  // Onload init: call a generic function to display the related options in the dynamic select box
  refreshDynamicSelectOptions(sel1, sel2, clonedOptions);
  // Onchange of the main select box: call a generic function to display the related options in the dynamic select box

  sel1.onchange = function() {
    refreshDynamicSelectOptions(sel1, sel2, clonedOptions);
  };
}

function refreshDynamicSelectOptions(sel1, sel2, clonedOptions) {
  while (sel2.options.length) {
    sel2.remove(0);
  }

  //alert(sel1.options[sel1.selectedIndex].value)

  // Create regular expression objects for "select" and the value of the selected option of the main select box as class names
  var pattern1 = /( |^)(select)( |$)/;
  var pattern2 = new RegExp("( |^)(" + sel1.options[sel1.selectedIndex].value + ")( |$)");
  // Iterate through all cloned options
  //alert(clonedOptions.length);
  for (var i = 0; i < clonedOptions.length; i++) {
    // If the classname of a cloned option either equals "select" or equals the value of the selected option of the main select box

    if (clonedOptions[i].className.match(pattern1) || clonedOptions[i].className.match(pattern2)) {
      // Clone the option from the hidden option pool and append it to the dynamic select box
      //alert("Did match")

      sel2.appendChild(clonedOptions[i].cloneNode(true));
      //alert(sel2.options[1]);
    }
  }
}
＆＃13; 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">

<head>
  <title>dynamic selectbox example</title>
  <script type="text/javascript" src="unobtrusivedynamicselect_ex5.js"></script>
</head>

<body>
  <form action="#">
    <div>
      <select id="pda-brand">
        <option value="select">Select PDA brand...</option>
        <option value="dell">Dell</option>
        <option value="hp">HP</option>
        <option value="palmone">PalmOne</option>
      </select>
      <select id="pda-type">
        <option class="select" value="select">Select PDA type...</option>
        <option class="dell" value="aximx30">Axim X30</option>
        <option class="dell" value="aximx50">Axim X50</option>
        <option class="hp" value="ipaqhx2750">iPAQ hx2750</option>
        <option class="hp" value="ipaqrx3715">iPAQ rx3715</option>
        <option class="hp" value="ipaqrz1710">iPAQ rz1710</option>
        <option class="palmone" value="tungstene2">Tungsten E2</option>
        <option class="palmone" value="tungstent5">Tungsten T5</option>
        <option class="palmone" value="zire72">Zire 72</option>
      </select>
      <script type="text/javascript">
        window.onload = function(e) {
          dynamicSelect("pda-brand", "pda-type");
        }
      </script>
    </div>
  </form>
</body>

</html>
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答案 1 :(得分：0)

我可以在IE-11中使用它，请自己尝试。

根据我的理解，问题是：

var clone = sel2.cloneNode(true);
var clonedOptions = clone.getElementsByTagName("option");

clonedOptions可能是clone名为option

的儿童的引用 
  sel1.onchange = function() {
    refreshDynamicSelectOptions(sel1, sel2, clonedOptions);
  };

在此函数中，引用了clonedOptions，但未引用clone。所以clone可能是垃圾收集的，因为IE找不到任何保留它的理由。 clonedOptions保留对不存在的集合的引用。

你可以用自己的方式更正，我只是传递clone而不是clonedOptions而且它适用于我IE11 

function dynamicSelect(id1, id2) {
  //alert("Everytime")
  // Browser and feature tests to see if there is enough W3C DOM support

  // Obtain references to both select boxes
  var sel1 = document.getElementById(id1);
  var sel2 = document.getElementById(id2);
  // Clone the dynamic select box      // Obtain references to all cloned options
  var clone = sel2.cloneNode(true);
  // Onload init: call a generic function to display the related options in the dynamic select box
  refreshDynamicSelectOptions(sel1, sel2, clone);
  // Onchange of the main select box: call a generic function to display the related options in the dynamic select box

  sel1.onchange = function() {
    refreshDynamicSelectOptions(sel1, sel2, clone);
  };
}

function refreshDynamicSelectOptions(sel1, sel2, clone) {
  var clonedOptions = clone.getElementsByTagName("option");
  while (sel2.options.length) {
    sel2.remove(0);
  }

  //alert(sel1.options[sel1.selectedIndex].value)

  // Create regular expression objects for "select" and the value of the selected option of the main select box as class names
  var pattern1 = /( |^)(select)( |$)/;
  var pattern2 = new RegExp("( |^)(" + sel1.options[sel1.selectedIndex].value + ")( |$)");
  // Iterate through all cloned options
  //alert(clonedOptions.length);
  for (var i = 0; i < clonedOptions.length; i++) {
    // If the classname of a cloned option either equals "select" or equals the value of the selected option of the main select box

    if (clonedOptions[i].className.match(pattern1) || clonedOptions[i].className.match(pattern2)) {
      // Clone the option from the hidden option pool and append it to the dynamic select box
      //alert("Did match")

      sel2.appendChild(clonedOptions[i].cloneNode(true));
      //alert(sel2.options[1]);
    }
  }
}
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">

<head>
  <title>dynamic selectbox example</title>
  <script type="text/javascript" src="unobtrusivedynamicselect_ex5.js"></script>
</head>

<body>
  <form action="#">
    <div>
      <select id="pda-brand">
        <option value="select">Select PDA brand...</option>
        <option value="dell">Dell</option>
        <option value="hp">HP</option>
        <option value="palmone">PalmOne</option>
      </select>
      <select id="pda-type">
        <option class="select" value="select">Select PDA type...</option>
        <option class="dell" value="aximx30">Axim X30</option>
        <option class="dell" value="aximx50">Axim X50</option>
        <option class="hp" value="ipaqhx2750">iPAQ hx2750</option>
        <option class="hp" value="ipaqrx3715">iPAQ rx3715</option>
        <option class="hp" value="ipaqrz1710">iPAQ rz1710</option>
        <option class="palmone" value="tungstene2">Tungsten E2</option>
        <option class="palmone" value="tungstent5">Tungsten T5</option>
        <option class="palmone" value="zire72">Zire 72</option>
      </select>
      <script type="text/javascript">
        window.onload = function(e) {
          dynamicSelect("pda-brand", "pda-type");
        }
      </script>
    </div>
  </form>
</body>

</html>

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