Question

我遇到了最奇怪的问题，虽然我确信它很简单 - 我很难过。我有一个事件隐藏并显示基于下拉菜单的div。当我从菜单中选择一些东西时，它什么也没做。但是，如果我将其更改为第二个选项，它将完美运行。谁知道我搞砸了什么？感谢您的任何和所有帮助。

function call1()
{
document.getElementById("quest1").onchange = function () {
  alert("ON CHANGE FIRED");
  var val = this.options[this.selectedIndex].value;
  document.getElementById("area1z").style.display = (val == "0") ? "block" : "none";
  document.getElementById("area1a").style.display = (val == "1") ? "block" : "none";
  document.getElementById("area1b").style.display = (val == "2") ? "block" : "none";
  document.getElementById("area1c").style.display = (val == "3") ? "block" : "none";
  document.getElementById("area1d").style.display = (val == "4") ? "block" : "none";
};
}

<select id="quest1" onChange="call1()">
<option value=0></option>
<option value=1>Stretch (Maintaining a lifestyle choice for an amount of time)            </option>
<option value=2>Sum (i.e. saving money, counting workouts, etc.</option>
<option value=3>Loss (i.e. Weightloss)</option>
<option value=4>None</option>
</select>

<div id=area1z style="display:none">Please Choose a Quest</div>
<div id=area1a style="display:none">Stretch</div>
<div id=area1b style="display:none">Sum</div>
<div id=area1c style="display:none">Loss</div>
<div id=area1d style="display:none">None</div>

Answer 1

从以下内容中移除onChange()：

<select id="quest1" onChange="call1()">

以这种方式写作：

document.getElementById("quest1").onchange = function () {
  alert("ON CHANGE FIRED");
  var val = this.options[this.selectedIndex].value;
  document.getElementById("area1z").style.display = (val == "0") ? "block" : "none";
  document.getElementById("area1a").style.display = (val == "1") ? "block" : "none";
  document.getElementById("area1b").style.display = (val == "2") ? "block" : "none";
  document.getElementById("area1c").style.display = (val == "3") ? "block" : "none";
  document.getElementById("area1d").style.display = (val == "4") ? "block" : "none";
};

Example

Answer 2

              <script>
                            function call1()
                        {

                          alert("ON CHANGE FIRED");
                          var val=document.getElementById("quest1").value;
                          alert(val);
                          document.getElementById("area1z").style.display = (val == "0") ? "block" : "none";
                          document.getElementById("area1a").style.display = (val == "1") ? "block" : "none";
                          document.getElementById("area1b").style.display = (val == "2") ? "block" : "none";
                          document.getElementById("area1c").style.display = (val == "3") ? "block" : "none";
                          document.getElementById("area1d").style.display = (val == "4") ? "block" : "none";

                        }
                        </script>
                        <select id="quest1" onChange="call1()">
                        <option value="0"></option>
                        <option value="1">Stretch (Maintaining a lifestyle choice for an amount of time)            </option>
                        <option value="2">Sum (i.e. saving money, counting workouts, etc.</option>
                        <option value="3">Loss (i.e. Weightloss)</option>
                        <option value="4">None</option>
                        </select>

                        <div id="area1z" style="display:none">Please Choose a Quest</div>
                        <div id="area1a" style="display:none">Stretch</div>
                        <div id="area1b" style="display:none">Sum</div>
                        <div id="area1c" style="display:none">Loss</div>
                        <div id="area1d" style="display:none">None</div>

Answer 3

这是您正在尝试的演示。

从代码中删除“onchaange”或“document.getElementById（”quest1“）。onchange = function（）{}”。

document.getElementById("quest1").onchange = function () {
  alert("ON CHANGE FIRED");
    var val = this.options[this.selectedIndex].value;
    document.getElementById("area1z").style.display = (val == "0") ? "block" : "none";
    document.getElementById("area1a").style.display = (val == "1") ? "block" : "none";
    document.getElementById("area1b").style.display = (val == "2") ? "block" : "none";
    document.getElementById("area1c").style.display = (val == "3") ? "block" : "none";
    document.getElementById("area1d").style.display = (val == "4") ? "block" : "none";
  };

jsfiddle链接：http://jsfiddle.net/2M74g/1/

dropdown onchange事件直到第二个实例才开始

3 个答案: