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我正在嘗試爲城市和(相關)州創建相關的下拉菜單。 這裏是state.html如何爲州和城市創建相關的下拉列表
<html>
<head><script type= "text/javascript" src = "countries2.js"></script></head>
<body>
Select Country: <select onchange="print_state('state',this.selectedIndex);" id="country" name ="country"></select>
<br />
City/District/State: <select name ="state" id ="state"></select>
<script language="javascript">print_country("country");</script>
</body>
</html>
和states.js
var country_arr = new Array("Andaman & Nicobar ","Andhra pradesh","Arunachal Pradesh","maharashtra");
var s_a = new Array();
s_a[0]="";
s_a[1]="Nicobar|North and Middle Andaman|South Andaman";
s_a[2]=" Adilabad|Anantapur|Chittoor|East Godavari|Guntur|Hyderabad|Kadapa|Karimnagar|Khammam|Krishna|Kurnool|Mahabubnagar|Medak|Nalgonda|Nellore|Nizamabad|Prakasam|Rangareddy|Srikakulam|Visakhapatnam|Vizianagaram|Warangal|West Godavari";
s_a[3]="Anjaw|Changlang|Dibang Valley|East Kameng|East Siang|Kurung Kumey|Lohit|Lower Dibang Valley|Lower Subansiri|Papum Pare|Tawang|Tirap|Upper Siang|Upper Subansiri|West Kameng|West Siang";
function print_country(country_id){
// given the id of the <select> tag as function argument, it inserts <option> tags
var option_str = document.getElementById(country_id);
var x, i=0;
for(x in country_arr){
option_str.options[i++] = new Option(country_arr[x],country_arr[x]);
}
}
function print_state(state_id, state_index){
var option_str = document.getElementById(state_id);
var x, i=0; state_index++;
var state_arr = s_a[state_index].split("|");
for(x in state_arr){
option_str.options[i++] = new Option(state_arr[x],state_arr[x]);
}
}
當我嘗試選擇選項,從先前選中狀態的城市出現在第二個下拉框。如何避免這種??