Question

我正在尝试提醒用户选择的值指定的对象的键（NOT值），但我没有运气。如果我在for循环中手动输入对象名，我可以成功提醒键。下面是我的代码片段：

<select id="state" class="pure-input-1-2" onchange="populateAirport(this.value)">
  <option value = ""></option>
  <option value = "AL">AL</option>
  <option value = "AK">AK</option>
</select>

function populateAirport(selectedValue){
  AL = {"Birmingham–Shuttlesworth International Airport":"BHM","Huntsville International Airport":"HSV"}
  AK = {"Ted Stevens Anchorage International Airport":"ANC","Fairbanks International Airport":"FAI","Juneau International Airport":"JNU","Ketchikan International Airport":"KTN"}

  for(var i in selectedValue){//if I replaced 'selectedValue' with 'AL' I alert the keys in the object just fine
        alert(i);
  }
}

我只想成为一个基于所选值动态引用对象的人。在此先感谢您的帮助。

Answer 1

在这种情况下，这就是我要做的事情：

HTML：

<select id="state" class="pure-input-1-2"   onchange="populateAirport(this.value)">
    <option value = ""></option>
    <option value = "AL">AL</option>
    <option value = "AK">AK</option>
</select>
<select id="airports"></select>

JS：

function populateAirport(selectedValue) {
    $('#airports').empty();

    var airports = {
        "AL": {
            "Birmingham–Shuttlesworth International Airport": "BHM",
            "Huntsville International Airport": "HSV"
        },
        "AK": {
            "Ted Stevens Anchorage International Airport": "ANC",
            "Fairbanks International Airport": "FAI",
            "Juneau International Airport": "JNU",
            "Ketchikan International Airport": "KTN"
        }
    };
    $.each(airports[selectedValue], function(key, val) {
        var opt = "<option value='" + val + "'>" + key + "</option>";
        $('#airports').append(opt);
    });
}

Alternitavely，你的循环也可以是这样的：

for(var key in airports[selectedValue]){
     var opt = "<option value='" + airports[selectedValue][key] + "'>" + key + "</option>";
     $('#airports').append(opt);
}

从用户选择的输入引用对象名称

1 个答案: