下拉菜单选择国家然后状态 [英] Drop down menu for selecting country then states
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问题描述
我想要创建一个下拉菜单，在所选值
的基础上生成另一个下拉菜单。例如，如果从第一个下拉菜单中选择美国，则第二个下拉菜单包含美国的状态。
我做了很多工作。我更喜欢一个javascript和使用数组
I want a to create a drop down menu which generates another drop down menu on the base of selected value Just for example if select United States from the 1st drop down then 2nd drop down contains the states of United states. I've done much of the job. I am prefering a javascript and using arrays
var country_arr = new Array("USA", "Singapore", "Pakistan")
var s_a = new Array();
s_a[0]="";
s_a[1]="CA|NJ|NY";
s_a[2]="paas|naas|taas";
s_a[3]="Islamabad|karachi|lahore";
但我也想要选择国家和州的名称，发送到mysql数据库。
我想我必须使用二维数组。但是无法编辑这段时间，并且需要您的帮助。
But I also want the "name" of the country and state selected, for sending to mysql database. I guess i've to use double dimensional array for this. But unable to code this time and seriously need your help.
推荐答案
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript">
var citiesByState = {
USA: ["NY","NJ"],
Singapore: ["taas","naas"]
}
function makeSubmenu(value) {
if(value.length==0) document.getElementById("citySelect").innerHTML = "<option></option>";
else {
var citiesOptions = "";
for(cityId in citiesByState[value]) {
citiesOptions+="<option>"+citiesByState[value][cityId]+"</option>";
}
document.getElementById("citySelect").innerHTML = citiesOptions;
}
}
function displaySelected() {
var country = document.getElementById("countrySelect").value;
var city = document.getElementById("citySelect").value;
alert(country+"\n"+city);
}
function resetSelection() {
document.getElementById("countrySelect").selectedIndex = 0;
document.getElementById("citySelect").selectedIndex = 0;
}
</script>
</head>
<body onload="resetSelection()">
<select id="countrySelect" size="1" onchange="makeSubmenu(this.value)">
<option></option>
<option>USA</option>
<option>Singapore</option>
</select>
<select id="citySelect" size="1">
<option></option>
</select>
<button onclick="displaySelected()">show selected</button>
</body>
</html>
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