[英]Filtering array on multiple options to return options in new select
我支持一些旧代码,在实现新功能时遇到一些问题。
我有2个多重选择选项,第一个显示州列表,第二个显示城市列表。 想法是,将根据第一选择中的选定州来过滤城市列表。
当前,城市包含在javascript数组中,该数组在if语句中用于将相关选项附加到select上,但是,这仅适用于单个州的选择。
如何在多个州选择中过滤城市?
我尝试了很多if语句组合,但没有运气。 我的jquery知识显然很缺乏,并且在google / stackoverflow中没有找到任何类似的东西-但是,我很欣赏我可能是从错误的角度来解决这个问题。
<form name="newform">
<select multiple size="10" name="getStateSelect" id="getStateSelectID" onchange="GetSeries(document.newform.getStateSelect.options [document.newform.getStateSelect.selectedIndex].value);">
<option value="1">Alaska</option>
<option value="2">Arizona</option>
<option value="3">Californa</option>
</select>
<br />
<br />
<select id="getCitySelect" multiple="multiple" size="10"></select>
</form>
var fsArray = [{id: 1,stateid: 1,cityname: "Anchorage"},
{id: 2,stateid: 1,cityname: "Fairbanks"},
{id: 3,stateid: 1,cityname: "Wasilla"},
{id: 4,stateid: 2,cityname: "Flagstaff"},
{id: 5,stateid: 2,cityname: "Phoenix"},
{id: 6,stateid: 2,cityname: "Tucson"},
{id: 7,stateid: 3,cityname: "Fremont"},
{id: 8,stateid: 3,cityname: "Lakeport"},
{id: 9,stateid: 3,cityname: "Los Angeles"}];
function GetSeries(i) {
var SeriesSelectBox = document.getElementById("getCitySelect");
SeriesSelectBox.options.length = 0;
for (j in fsArray) {
if (fsArray[j].stateid == i) {
var seriesLength = SeriesSelectBox.options.length;
SeriesSelectBox.options[seriesLength] = new Option(fsArray[j].cityname, fsArray[j].id);
}
}
}
http://jsfiddle.net/fcp3h7mw/1/
任何帮助,不胜感激! 谢谢
我只是在getStateSelectID值上添加了一个for循环,以检查每个元素是否处于选择状态,如果选中,它将运行您的循环以添加城市。
小提琴: http : //jsfiddle.net/fcp3h7mw/5/
JavaScript的:
var fsArray = [
{id:1,stateid:1,cityname:"Anchorage"},
{id:2,stateid:1,cityname:"Fairbanks"},
{id:3,stateid:1,cityname:"Wasilla"},
{id:4,stateid:2,cityname:"Flagstaff"},
{id:5,stateid:2,cityname:"Phoenix"},
{id:6,stateid:2,cityname:"Tucson"},
{id:7,stateid:3,cityname:"Fremont"},
{id:8,stateid:3,cityname:"Lakeport"},
{id:9,stateid:3,cityname:"Los Angeles"}
];
function GetSeries(i) {
var id = document.getElementById("getStateSelectID");
var SeriesSelectBox = document.getElementById("getCitySelect");
SeriesSelectBox.options.length = 0;
var states = 0;
for (states=0; states < id.length; states++) {
if(id[states].selected){
for (j in fsArray) {
if (fsArray[j].stateid == id[states].value) {
var seriesLength = SeriesSelectBox.options.length;
SeriesSelectBox.options[seriesLength] = new Option(fsArray[j].cityname, fsArray[j].id);
}
}
}
}
}
标记:在标记中,我还提取了很多函数调用
<select multiple size="10" name="getStateSelect" id="getStateSelectID" onchange="GetSeries();">
我已经更新了您的代码,以便能够选择多个州并显示正确的城市。
本质上,您需要获取属性为“ selected”的选项列表,并将选项值存储在数组中(onchange)
之后,您将遍历新数组并与该数组中的值而不是单个值进行匹配。
这是更新的代码: http : //jsfiddle.net/biz79/fcp3h7mw/3/
var fsArray = [
{id:1,stateid:1,cityname:"Anchorage"},
{id:2,stateid:1,cityname:"Fairbanks"},
{id:3,stateid:1,cityname:"Wasilla"},
{id:4,stateid:2,cityname:"Flagstaff"},
{id:5,stateid:2,cityname:"Phoenix"},
{id:6,stateid:2,cityname:"Tucson"},
{id:7,stateid:3,cityname:"Fremont"},
{id:8,stateid:3,cityname:"Lakeport"},
{id:9,stateid:3,cityname:"Los Angeles"}
];
function getSeries() {
var SeriesSelectBox = document.getElementById("getCitySelect");
SeriesSelectBox.options.length = 0;
var arr = getStateSelected();
for (var i = 0; i< arr.length; i++) {
for (var j in fsArray) {
if (fsArray[j].stateid == arr[i]) {
var seriesLength = SeriesSelectBox.options.length;
SeriesSelectBox.options[seriesLength] = new Option(fsArray[j].cityname, fsArray[j].id);
}
}
}
}
function getStateSelected() {
var sel = document.querySelectorAll('#getStateSelectID option');
var arr = [];
for (var i = 0; i< sel.length; i++ ) {
if ( sel[i].selected ) {
arr.push(sel[i].value);
}
}
return arr;
}
希望这可以帮助。 如果您有任何问题,请告诉我。
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