一个视图中有三个DDL。我在第一个DDL的"onchange"上触发一个javascript函数来填充第二个DDL,第二个DDL来填充第三个DDL。没问题。
问题是,当第一个DDL被设置为未选择时,即"Select a Value"时,第二个DDL被触发并将自身设置为"Select a Value",但第二个DDL 'onchange'事件没有触发,因此第三个DDL仍然填充着从前一个选择中获得的数据。
如何让第二个DDL触发一个事件,我可以用它来刷新第三个DDL?还是有别的办法?
下面的代码:@{
ViewBag.Title = "CascadingList";
Layout = "~/Views/Shared/_Layout.cshtml";
}
@{Html.EnableUnobtrusiveJavaScript(true);}
<script type="text/javascript">
$(document).ready(function () {
getMarket();
});
function getMarket() {
var url = '@Url.Content("~/Strategies/MarketList")/';
$.getJSON(url, function (data) {
var items = "<option>Select a Market</option>";
$.each(data, function (i, market) {
if (market.Value.indexOf("'") > -1) {
s = market.Value + " " + market.Text;
alert(s + ": Market.Value cannot contain '")
}
items += "<option value='" + market.Value + "'>" + market.Text + " </option>";
});
$('#MarketsID').html(items);
});
}
function getShareType() {
var url = '@Url.Content("~/Strategies/ShareTypeList")/' + $('#MarketsID').val();
$.getJSON(url, function (data) {
var items = '<option>Select an Asset Type</option>';
$.each(data, function (i, shareType) {
items += "<option value='" + shareType.Value + "'>" + shareType.Text + " </option>";
});
$('#ShareTypesID').html(items);
});
}
function getShare() {
var url = '@Url.Content("~/Strategies/ShareList")/' + $('#MarketsID').val() + '|' + $('#ShareTypesID').val();
$.getJSON(url, function (data) {
var items = '<option>Select a Share</option>';
$.each(data, function (i, share) {
items += "<option value='" + share.Value + "'>" + share.Text + "</option>";
});
$('#SharesID').html(items);
});
}
</script>
<h2>Strategy</h2>
<div id="MarketsDivID">
<label for="Markets">Markets</label>
<select id="MarketsID" name="Markets" onchange="getShareType()"></select>
</div>
<div id="ShareTypesDivID">
<label for="ShareTypes">ShareTypes</label>
<select id="ShareTypesID" name="ShareTypes" onchange="getShare()" ></select>
</div>
<div id="SharesDivID">
<label for="Shares">Shares</label>
<select id="SharesID" name="Shares" ></select>
</div>
尝试使用$('#selectID').val()
填充select
后选择一个值,如果不工作触发onchange
这样;$('#selectID').trigger('change')
谢谢——我试过了,但绕了一圈——但它让我有了不同的想法。通过在填充第二个DDL的函数中添加对填充第三个DDL的函数的调用来修复它——这样它总是被调用。
function getShareType() {
var url = '@Url.Content("~/Strategies/ShareTypeList")/' + $('#MarketsID').val();
$.getJSON(url, function (data) {
var items = '<option>Select an Asset Type</option>';
$.each(data, function (i, shareType) {
items += "<option value='" + shareType.Value + "'>" + shareType.Text + "</option>";
});
$('#ShareTypesID').html(items);
});
**** Added This ****
getShare();
}