我有 2 个选择框,我想将它们的值添加到基于更改选择框的选择框。我写了下面的代码。但它只适用于一个。 我怎样才能做到这一点 ? 这是我的代码:
var selectBox = document.getElementById('mySelect');
var selectBox2 = document.getElementById('mySelect2');
selectBox.addEventListener('change', handleChange);
selectBox2.addEventListener('change', handleChange);
function handleChange()
{
var selectedValue = this.options[this.selectedIndex].value;
document.getElementById('myInput').value = selectedValue;
document.getElementById('myInput2').value = selectedValue;
}
<select id="mySelect">
<option value="Option 1">Option 1</option>
<option value="Option 2">Option 2</option>
<option value="Option 3">Option 3</option>
</select>
<select id="mySelect2">
<option value="Option 1">Option 1</option>
<option value="Option 2">Option 2</option>
<option value="Option 3">Option 3</option>
</select>
<input type="text" id="myInput" />
<input type="text" id="myInput2" />
最佳答案
var selectBox = document.getElementById('mySelect');
var selectBox2 = document.getElementById('mySelect2');
selectBox.addEventListener('change', handleChange);
selectBox2.addEventListener('change', handleChange);
function handleChange(event)
{
if (event.target.id == "mySelect") {
document.getElementById('myInput').value = selectBox.value;
} else {
document.getElementById('myInput2').value = selectBox2.value;
}
}
<select id="mySelect">
<option value="Option 1">Option 1</option>
<option value="Option 2">Option 2</option>
<option value="Option 3">Option 3</option>
</select>
<select id="mySelect2">
<option value="Option 1">Option 1</option>
<option value="Option 2">Option 2</option>
<option value="Option 3">Option 3</option>
</select>
<input type="text" id="myInput" />
<input type="text" id="myInput2" />
关于javascript - 如何将选择框的值添加到文本框?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46137440/