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[英]How jQuery to change a second select list based on the Third select list option and second select based upon first
[英]Add selected for jQuery to change a second select list based on the first select list option
我使用“ 使用jQuery基於第一選擇列表選項更改第二選擇列表 ”下面的代碼, 基於第一選擇列表選項更改第二選擇列表。 效果很好。 但是,如何為這兩個選擇將“ selected”屬性分配給此代碼上的選項。
JavaScript的:
$(document).ready(function () {
"use strict";
var selectData, $states;
function updateSelects() {
var cities = $.map(selectData[this.value], function (city) {
return $("<option />").text(city);
});
$("#city_names").empty().append(cities);
}
$.getJSON("updateSelect.json", function (data) {
var state;
selectData = data;
$states = $("#us_states").on("change", updateSelects);
for (state in selectData) {
$("<option />").text(state).appendTo($states);
}
$states.change();
});
});
HTML:
<!DOCTYPE html>
<html>
<head>
<title></title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
</head>
<body>
<select id="us_states"></select>
<select id="city_names"></select>
<script type="text/javascript" src="updateSelect.js"></script>
</body>
</html>
JSON:
{
"NE": [
"Smallville",
"Bigville"
],
"CA": [
"Sunnyvale",
"Druryburg",
"Vickslake"
],
"MI": [
"Lakeside",
"Fireside",
"Chatsville"
]
}
如果您知道要選擇的確切選項值,則可以嘗試執行以下操作:
$(document).ready(function() { "use strict"; var selectData, $states; function updateSelects() { var cities = $.map(selectData[this.value], function(city) { var selected = ""; if (city == "Vickslake") { selected = "selected"; } return $("<option " + selected + "/>").text(city); }); $("#city_names").empty().append(cities); } $.getJSON("https://api.myjson.com/bins/oj1bb", function(data) { var state; selectData = data; $states = $("#us_states").on("change", updateSelects); for (state in selectData) { var selected = ""; if (state == "CA") { selected = "selected"; } $("<option " + selected + "/>").text(state).appendTo($states); } $states.change(); }); });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <body> <select id="us_states"></select> <select id="city_names"></select> <script type="text/javascript" src="updateSelect.js"></script> </body>
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