Question

新手JS在这里，我需要从10个城市的数组填充下拉列表，我无法获得任何代码。

<select id="selectCity">
<option>Choose a City</option>
</select>

var select = document.getElementById('selectCity');
var options = ["Winthrop","Revere","Malden","East Boston","Medford","Somerville","South Boston","Quincy","Malden","Weymouth"];

//what code will work in this loop below???

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

}

Answer 1

试试这段代码。

var select = document.getElementById('selectCity');
var options = ["Winthrop","Revere","Malden","East Boston","Medford","Somerville","South Boston","Quincy","Malden","Weymouth"];

for(var i = 0; i < options.length; i++) {
    var opt = options[i];
    var el = document.createElement("option");
    el.textContent = opt;
    el.value = opt;
    select.appendChild(el);
}

Answer 2

试试这个

var select = document.getElementById('selectCity');
var options = ["Winthrop", "Revere", "Malden", "East Boston", "Medford", "Somerville", "South Boston", "Quincy", "Malden", "Weymouth"];

//what code will work in this loop below???

var s = document.getElementById("selectCity");
for (var i = 0; i < options.length; i++) {
  s.innerHTML += `<option value=${i}> ${options[i]}</option>`;
}

<select id="selectCity">
  <option>Choose a City</option>
</select>

Answer 3

这对你有用！

您只需将此代码放入循环中：

var option = document.createElement（“option”）;

option.text = options [i];

option.value = options [i];

select.appendChild（可选）;

<select id="selectCity">
    <option>Choose a City</option>
</select>

<script type="text/javascript">
    var select = document.getElementById('selectCity');
    var options = ["Winthrop","Revere","Malden","East Boston","Medford","Somerville","South Boston","Quincy","Malden","Weymouth"];
    for(var i = 0; i < options.length; i++) {
        var option = document.createElement("option");
        option.text = options[i];
        option.value = options[i];
        select.appendChild(option);
    }
</script>

初学者Javascript数组下拉列表

3 个答案: