[英]dropdown onchange event not firing until second instance
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>
从以下内容中删除onChange()
:
<select id="quest1" onChange="call1()">
用这种方式写:
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";
};
<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>
这是您正在尝试的演示。
要么从代码中删除“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/
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