实现css无法使用动态选择。它与各国合作，但没有显示国家。
我认为jquery存在一些问题。
请检查我的代码段。
我已经检查了互联网上的所有内容。但没有什么对我有用。
var country_arr = new Array("Afghanistan", "Albania", "Algeria", "American Samoa", "Angola", "Anguilla", "Antartica", "Antigua and Barbuda", "Argentina", "Armenia" );
// States
var s_a = new Array();
s_a[0]="";
s_a[1]="Badakhshan|Badghis|Baghlan|Balkh|Bamian|Farah|Faryab|Ghazni|Ghowr|Helmand|Herat|Jowzjan|Kabol|Kandahar|Kapisa|Konar|Kondoz|Laghman|Lowgar|Nangarhar|Nimruz|Oruzgan|Paktia|Paktika|Parvan|Samangan|Sar-e Pol|Takhar|Vardak|Zabol";
s_a[2]="Berat|Bulqize|Delvine|Devoll (Bilisht)|Diber (Peshkopi)|Durres|Elbasan|Fier|Gjirokaster|Gramsh|Has (Krume)|Kavaje|Kolonje (Erseke)|Korce|Kruje|Kucove|Kukes|Kurbin|Lezhe|Librazhd|Lushnje|Malesi e Madhe (Koplik)|Mallakaster (Ballsh)|Mat (Burrel)|Mirdite (Rreshen)|Peqin|Permet|Pogradec|Puke|Sarande|Shkoder|Skrapar (Corovode)|Tepelene|Tirane (Tirana)|Tirane (Tirana)|Tropoje (Bajram Curri)|Vlore";
s_a[3]="Adrar|Ain Defla|Ain Temouchent|Alger|Annaba|Batna|Bechar|Bejaia|Biskra|Blida|Bordj Bou Arreridj|Bouira|Boumerdes|Chlef|Constantine|Djelfa|El Bayadh|El Oued|El Tarf|Ghardaia|Guelma|Illizi|Jijel|Khenchela|Laghouat|M'Sila|Mascara|Medea|Mila|Mostaganem|Naama|Oran|Ouargla|Oum el Bouaghi|Relizane|Saida|Setif|Sidi Bel Abbes|Skikda|Souk Ahras|Tamanghasset|Tebessa|Tiaret|Tindouf|Tipaza|Tissemsilt|Tizi Ouzou|Tlemcen";
s_a[4]="Eastern|Manu'a|Rose Island|Swains Island|Western";
s_a[5]="Andorra la Vella|Bengo|Benguela|Bie|Cabinda|Canillo|Cuando Cubango|Cuanza Norte|Cuanza Sul|Cunene|Encamp|Escaldes-Engordany|Huambo|Huila|La Massana|Luanda|Lunda Norte|Lunda Sul|Malanje|Moxico|Namibe|Ordino|Sant Julia de Loria|Uige|Zaire";
s_a[6]="Anguilla";
s_a[7]="Antartica";
s_a[8]="Barbuda|Redonda|Saint George|Saint John|Saint Mary|Saint Paul|Saint Peter|Saint Philip";
s_a[9]="Antartica e Islas del Atlantico Sur|Buenos Aires|Buenos Aires Capital Federal|Catamarca|Chaco|Chubut|Cordoba|Corrientes|Entre Rios|Formosa|Jujuy|La Pampa|La Rioja|Mendoza|Misiones|Neuquen|Rio Negro|Salta|San Juan|San Luis|Santa Cruz|Santa Fe|Santiago del Estero|Tierra del Fuego|Tucuman";
s_a[10]="Aragatsotn|Ararat|Armavir|Geghark'unik'|Kotayk'|Lorri|Shirak|Syunik'|Tavush|Vayots' Dzor|Yerevan";
// <!-- -->
function populateStates( countryElementId, stateElementId ){
var selectedCountryIndex = document.getElementById( countryElementId ).selectedIndex;
var stateElement = document.getElementById( stateElementId );
stateElement.length=0; // Fixed by Julian Woods
stateElement.options[0] = new Option('Select State','');
stateElement.selectedIndex = 0;
var state_arr = s_a[selectedCountryIndex].split("|");
for (var i=0; i<state_arr.length; i++) {
stateElement.options[stateElement.length] = new Option(state_arr[i],state_arr[i]);
}
$("#" + stateElementId).material_select();
}
function populateCountries(countryElementId, stateElementId){
// given the id of the <select> tag as function argument, it inserts <option> tags
var countryElement = document.getElementById(countryElementId);
countryElement.length=0;
countryElement.options[0] = new Option('Select Country','-1');
countryElement.selectedIndex = 0;
for (var i=0; i<country_arr.length; i++) {
countryElement.options[countryElement.length] = new Option(country_arr[i],country_arr[i]);
}
// Assigned all countries. Now assign event listener for the states.
if( stateElementId ){
countryElement.onchange = function(){
populateStates( countryElementId, stateElementId );
};
}
}
populateCountries("country", "state");
$(function () {
$(document).ready(function () {
var max_fields = 10; //maximum input boxes allowed
var wrapper = $("#raghav"); //Fields wrapper
var add_button = $(".addmore"); //Add button ID
var x = 1; //initlal text box count
$(add_button).click(function (e) { //on add input button click
e.preventDefault();
if (x < max_fields) { //max input box allowed
x++; //text box increment
$(wrapper).append('Select Country: <select id="country'+x+'" name="country" class="country"></select> Select State: <select id="state'+x+'" name="state" class="state"></select>');
populateCountries("country"+x+"", "state"+x+"");
}
});
});
});<head>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.6/css/materialize.min.css">
</head>
<body>
<div class="form-group" id="raghav">
Select Country:<select id="country" name ="country" ></select>
Select State: <select name ="state" id ="state" class="state"></select>
</div>
<div class="button-div">
<input type="button" name="addmore" class="addmore" value="Add More">
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.6/js/materialize.min.js"></script>
<script>
$(document).ready(function() {
$('select').material_select(); //select js
});
</script>
</body>
答案 0 :(得分：2)
material_select().为ul创建列表select，为li创建options，然后shows为此dropdown创建列表material_select您致电ul时，只有国家/地区下拉列表中包含数据，并且仅为此创建options，以便显示其ul。
当您填充状态下拉列表material_select时，未创建该下拉列表，因此当您填充州下拉列表时，它不会显示您需要致电function populateStates( countryElementId, stateElementId ){
var selectedCountryIndex = document.getElementById( countryElementId ).selectedIndex;
var stateElement = document.getElementById( stateElementId );
stateElement.length=0; // Fixed by Julian Woods
stateElement.options[0] = new Option('Select State','');
stateElement.selectedIndex = 0;
var state_arr = s_a[selectedCountryIndex].split("|");
for (var i=0; i<state_arr.length; i++) {
stateElement.options[stateElement.length] = new Option(state_arr[i],state_arr[i]);
}
$("#" + stateElementId).material_select();
}
。
<!DOCTYPE HTML>
<html ng-app>
<head>
<meta charset="utf-8">
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.7/angular.min.js"></script>
</head>
<body>
<div ng-show="!inputIsOn" ng-click="inputIsOn = true">Click here</div>
<input ng-show="inputIsOn" type="text">
</body>
</html>