MVC3级联下拉列表从数据库中预选值
本文关键字:数据库 级联 下拉列表 MVC3 | 更新日期: 2023-09-27 18:07:23
我使用jQuery和AJAX实现了一个级联下拉列表。这在创建项目上很好,但是当我编辑现有项目时,我需要从数据库中预先选择值。我试图创建一个SelectList与预选值从模型,但这只在第一个下拉列表工作。
如何制作显示项目"区域"answers"类别"值的其他列表?
这是我的jQuery代码: <script type="text/javascript">
$(document).ready(function() {
$("#ddlDeps").change(function() {
var idArea = $(this).val();
$.getJSON("/Admin/LoadAreasByDepartment", { id: idArea },
function(depData) {
var select = $("#ddlAreas");
select.empty();
select.append($('<option/>', {
value: 0,
text: "Выберите направление"
}));
$.each(depData, function(index, itemData) {
select.append($('<option/>', {
value: itemData.Value,
text: itemData.Text
}));
});
});
});
$("#ddlAreas").change(function() {
var idCategory = $(this).val();
$.getJSON("/Admin/LoadCategoriesByArea", { id: idCategory },
function(areaData) {
var select = $("#ddlCategories");
select.empty();
select.append($('<option/>', {
value: 0,
text: "Выберите категорию"
}));
$.each(areaData, function(index, itemData) {
select.append($('<option/>', {
value: itemData.Value,
text: itemData.Text
}));
});
});
});
});
这是我的cascascasingdownlist代码:
<p>
@Html.DropDownListFor(model => model.DepartmentId, new SelectList(Model.DataContainer.Departments, "Id", "Name"),
"Выберите отдел", new {id = "ddlDeps"})
@Html.ValidationMessageFor(model => model.DepartmentId)
</p>
<p>
@{
var areaSelectList = new SelectList(Enumerable.Empty<SelectListItem>(), "DepartmentId", "Title", Model.AreaId);
var categorySelectList = new SelectList(Enumerable.Empty<SelectListItem>(), "AreaId", "Title", Model.CategoryId);
}
@Html.DropDownListFor(model => model.AreaId, areaSelectList,
"Выберите направление", new {id = "ddlAreas"})
@Html.ValidationMessageFor(model => model.AreaId)
</p>
<p>
@Html.DropDownListFor(model => model.CategoryId, categorySelectList,
"Выберите категорию", new {id = "ddlCategories"})
</p>
将此替换为您的代码并尝试。
@{
var areaSelectList = new SelectList(Model.DataContainer.Areas, "DepartmentId", "Title", Model.AreaId);
var categorySelectList = new SelectList(Model.DataContainer.Categories, "AreaId", "Title", Model.CategoryId);
}