[英]How can I rewrite this javascript code, so that it will refer to every optionbox?
如何重写此javascript代码，以便它将引用每个选项框（不仅是第一个选项框）？
<html>
<div id="form123">
<select id="day" name="day">
<option value="abc" name="abc" id="abc">abc</option>
<option value="other" name="other" id="other">other...</option>
</select>
<select id="day" name="day">
<option value="abc" name="abc" id="abc">abc</option>
<option value="other" name="other" id="other">other...</option>
</select>
<select id="day" name="day">
<option value="abc" name="abc" id="abc">abc</option>
<option value="other" name="other" id="other">other...</option>
</select>
<script type="text/javascript">
var selectmenu=document.getElementById("day")
selectmenu.onchange=function(){
var chosenoption=this.options[this.selectedIndex]
if (chosenoption.value=="other"){
var entered_date = window.prompt("Enter the date","");
document.getElementById('other').value = entered_date;
document.getElementById('other').text = entered_date;
}
}
</script>
</div>
</html>
到目前为止，仅当我选择第一个选项框时才会显示对话框。
即使选择另一个选项框，我也要显示对话框。
将来，选项框将动态添加。
ID必须是唯一的。 我建议在每次更改事件select时都使用一个函数，并将this作为参数传递，例如：
function changeDate(obj) { var chosenoption = obj.options[obj.selectedIndex]; if (chosenoption.value == "other") { var winProVal = window.prompt("Enter the date", ""); if (winProVal != null) { obj.options[obj.value].value = obj.options[obj.value].text = winProVal; } } }
<select class="day" name="day" onchange='changeDate(this);'> <option value="abc" name="abc" id="abc">abc</option> <option value="other" name="other" id="other">other...</option> </select> <select class="day" name="day" onchange='changeDate(this);'> <option value="abc" name="abc" id="abc">abc</option> <option value="other" name="other" id="other">other...</option> </select> <select class="day" name="day" onchange='changeDate(this);'> <option value="abc" name="abc" id="abc">abc</option> <option value="other" name="other" id="other">other...</option> </select>
this是指元素。 还要通过类更改ID 。
ID应该是唯一的（名称也应如此）。 您可以定义元素类并相应地更改js。
<html>
<div id="form123">
<select id="day" name="day" class="day">
<option value="abc" name="abc1" id="abc1">abc</option>
<option value="other" name="other1" id="other1">other...</option>
</select>
<select id="day" name="day" class="day">
<option value="abc" name="abc2" id="abc2">abc</option>
<option value="other" name="other2" id="other2">other...</option>
</select>
<select id="day" name="day" class="day">
<option value="abc" name="abc3" id="abc3">abc</option>
<option value="other" name="other3" id="other3">other...</option>
</select>
<script type="text/javascript">
var selectmenu=document.getElementsByClassName("day");
for (var i = 0; i < selectmenu.length; ++i) {
selectmenu[i].onchange=function(){
var chosenoption=this.options[this.selectedIndex]
if (chosenoption.value=="other"){
var entered_date = window.prompt("Enter the date","");
this.options[1].value = entered_date;
this.options[1].text = entered_date;
}
}
}
</script>
</div>
</html>
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