Javascript issue with IE11

本文关键字：IE11 with issue Javascript 更新时间：2023-09-26

我的应用程序在IE9之前运行良好，现在当我将其升级到IE11时它停止工作。这是一个示例 html 和 js 。

问题

在第一次运行中，即。加载时效果很好。但是当我选择PDA品牌时，第二个下拉菜单的所有选项都变为空白。

在控制台中，对象 clonedOptions 上Invalid Calling Object error出现脚本错误。

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]);
    }
  }
}

<!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>

发行线

在下面的位置中，对于克隆选项，我收到无效调用对象错误。

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

我认为问题是您正在使用返回实时列表的getElementsByTagName，这意味着如果从 DOM 中删除一个项目，它也将从列表中删除，因此有资格进行垃圾回收。请参阅 https://developer.mozilla.org/en-US/docs/Web/API/Element/getElementsByTagName

返回的列表是实时的，这意味着它会使用 DOM 树自动更新自身。

下面的例子将解释我的意思

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

<p>Hello</p>
<p>Hello</p>
<p>Hello</p>

我没有最新的IE，但我有一种强烈的感觉，如果你使用clone.querySelectorAll("option")，你就不会有同样的问题，因为节点将不符合垃圾回收的条件，因为它返回的列表不是实时的。

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]);
    }
  }
}

<!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>

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 可能是对标记名称为 option 的clone子项的引用

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

在这个函数中，有一个对clonedOptions的引用，但没有对clone的引用。所以clone可能是垃圾收集的，因为IE找不到任何理由保留它。 clonedOptions保留对不存在的集合的引用。

你可以用你自己的方式纠正，我只是通过clone而不是clonedOptions它对我有用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>