使用JSON中的Jquery更新下拉列表 [英] Updating a Drop down list with Jquery from JSON
问题描述
我有一个列表,我需要使用JSON的对象集合来填充。以下是我的行动回归:
I have a list that I need to fill using a JSON collection of object. Here is what my action is returning:
public ActionResult GetProductCategories()
{
var categories = _entities.ProductCategories.ToList();
var result = new List<SelectListItem>();
foreach (var category in categories)
{
result.Add(new SelectListItem {Text = category.CategoryName, Value = category.CategoryId.ToString()});
}
return Json(result, JsonRequestBehavior.AllowGet);
}
这是我为各种各样的javascript收集的内容来源:
This is what I've come up with for my javascript, gathered from various sources:
function loadCategories() {
$.getJSON("/Admin/Product/GetProductCategories", null, function (data) {
var selectList = $("#subCategories");
$.each(data, function(index, optionData)
{
var option = new Option(optionData.Text, optionData.Value);
selectList.add(option, null);
});
});
}
但它似乎没有工作,并且没有给予任何错误。什么是这种事情的最佳做法?
But it doesn't appear to be working, and isn't giving any errors. Whats the best practice for this sort of thing?
推荐答案
我想知道你在下一行代码中想要实现什么,
I was wondering what are you trying to achieve in this next lines of codes,
var option = new Option(optionData.Text, optionData.Value);
selectList.add(option, null);
您是否尝试创建选项
然后将其添加到选择
?如果是这样,就这样做,使用 .append()
are you trying to create an option
then add it on select
? if so, do it like this, use .append()
selectList.append(option);
有了这个,我还在假设新选项(optionData.Text, optionData.Value);
正在创建一个新的选项
,在jQuery中它就像这个 var option = $(' < option>')。text(optionData.Text).val(optionData.Value);
with that, I'm still assuming new Option(optionData.Text, optionData.Value);
is creating a new option
, in jQuery it would be like this var option = $('<option>').text(optionData.Text).val(optionData.Value);
为添加了注释.add()
,
var selectList = $("#subCategories"); // creates jQuery object selectList.
selectList.add(option, null); // selectList is jQuery object,
// so when you call .add(), you're calling jQuery's `add()`.
解决方法就是这样,
selectList[0].add(option, null); // you can use [0] to convert it into DOM object.
之间的差异:
- DOM
select
object's .add() - jQuery object's .add()
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