[英]How do i create cascading textboxes in ASp.net mvc4 using jquery ajax
[英]MVC4 - Implement Cascading Multiselect List Boxes using Ajax
我正在使用MVC4,正在嘗試將級聯列表框實現到我的一個視圖中,我一直在遵循本教程並成功創建了2個級聯下拉框,但是現在我需要列表框具有相同類型的功能,用戶可以在其中使用選擇多個項目。
只是為了澄清一下,用戶將能夠從下拉列表中選擇威脅。
選擇威脅后,將在列表框中填充所選威脅的相關安全事件,此處用戶將能夠選擇多個安全事件或單個安全事件
選擇其選定的安全事件后,將在另一個列表框中填充與選定的安全事件關聯的任何控件。
這是我到目前為止的
查看模型
public class AddNewRiskVM
{
public SelectList RiskTypeList { get; set; }
public SelectList GroupMembersList { get; set; }
public SelectList ThreatsList { get; set; }
public SelectList SecurityEventsList { get; set; }
public List<int> SelectedSecurityEventsIDs { get; set; }
public SelectList ISOControlList { get; set; }
public List<int> AssociatedIsoIDs { get; set; }
public int ISOControlID { get; set; }
public AddNewRiskVM()
{
SelectedSecurityEventsIDs = new List<int>();
AssociatedIsoIDs = new List<int>();
}
}
調節器
public void ConfigureNewRisk(AddNewRiskVM ViewModel)
{
var RiskTypes = _DBContext.RiskTypes;
var Threats = _DBContext.Threats;
ViewModel.RiskTypeList = new SelectList(RiskTypes, "ID", "Description");
ViewModel.GroupMembersList = new SelectList(new List<GroupMember>(), "ID", "Name");
ViewModel.ThreatsList = new SelectList(Threats, "ID", "Description");
ViewModel.SecurityEventsList = new SelectList(new List<SecurityEvent>(), "ID", "Description");
ViewModel.ISOControlList = new SelectList(new List<ISOControl>(), "ID", "Description");
}
public ActionResult AddNewRisk()
{
AddNewRiskVM ViewModel = new AddNewRiskVM();
ConfigureNewRisk(ViewModel);
return View(ViewModel);
}
public IEnumerable<ISOControl> GetISOControls(int SecurityEventID)
{
var QueryResults = _DBContext
.SecurityEventHasISOControls
.Include("SecurityEventHasISOControls.ISOControlID")
.Where(x => x.SecurityEventID == SecurityEventID)
.Select(x => x.ISOControl);
return QueryResults;
}
public JsonResult GetJsonISOControl(int ID)
{
var ISOControlListT = this.GetISOControls(Convert.ToInt32(ID));
var ISOControlList = ISOControlListT.Select(x => new SelectListItem()
{
Text = x.Description,
Value = x.ID.ToString(),
});
return Json(ISOControlList, JsonRequestBehavior.AllowGet);
}
注-我有與用於SecurityEvent的GetISOControl和GetJsonControl類似的方法
視圖
<div class="containeSelect">
@using (Html.BeginForm(null, null, new { @id = string.Empty }, FormMethod.Post, new { @id = "AddNewWithSelect" }))
{
<h3>Add New Risk</h3>
<fieldset>
@Html.DropDownList("RiskType", Model.RiskTypeList, "Select Risk Type", htmlAttributes: new { @class = "CascadeInputBox", onchange = "GetMembers()"})
@Html.DropDownList("GroupMember", Model.GroupMembersList, "Select Group Member", htmlAttributes: new {@class = "CascadeInputBox", @id = "CascadeDropDownList2"})
@Html.DropDownList("Threats", Model.ThreatsList, "Select Threat", htmlAttributes: new { @class = "CascadeInputBox", onchange = "GetSecurityEvents()"})
@Html.ListBoxFor(m => m.SelectedSecurityEventsIDs, Model.SecurityEventsList, htmlAttributes: new { @id = "SelectListEvent", onchange = "GetISOControls()"})
@Html.ListBox("ISOControls", Model.ISOControlList, htmlAttributes: new { @id = "SelectListISO"})
</fieldset>
}
<script>
function GetISOControls() {
$.ajax({
url: "@Url.Action("GetJsonISOControl", "RiskAssesment")",
dataType: "json",
type: "GET",
data: { id: $("#Events").val() },
error: function () {
},
beforeSend: function () {
},
success: function (data) {
var items = "";
$.each(data, function (i, item) {
items += "<option value=\"" + item.Value + "\">" + item.Text + "</option>";
});
$("#SelectListISO").html(items);
}
});
}
</script>
<script>
function GetSecurityEvents() {
$.ajax({
url: "@Url.Action("GetJsonSecurityEvent", "RiskAssesment")",
dataType: "json",
type: "GET",
data: { id: $("#Threats").val() },
error: function () {
},
beforeSend: function () {
},
success: function (data) {
var items = "";
$.each(data, function (i, item) {
items += "<option value=\"" + item.Value + "\">" + item.Text + "</option>";
});
$("#SelectListEvent").html(items);
}
});
}
</script>
這是我第一次使用ajax,我知道我必須以某種方式更改下面的行,因為在我的輔助方法中,我沒有使用字符串名稱,而是使用了linq表達式,也許這就是所需要的為了這個工作,現在我看不到其他任何東西,但是可能丟失了什么?
data: { id: $("#Events").val() },
如果有人可以提供任何建議,尤其是使用ajax,將不勝感激。
提前致謝
您沒有一個id="Events"
的元素。 您引用的列表框具有id="SelectedSecurityEventIDs"
。 而且由於它的<select multiple>
值是一個數組,因此您需要jQuery.param方法來序列化數據。 我建議您使用Unobtrusive Javascript ,而不是用行為污染標記,以便將GetISOControls
腳本替換為
var isoList = $("#SelectListISO"); // cache it
$('#SelectedSecurityEventIDs').change(function() {
// create a serialized representation of the selected values
var data = $.param({ id: $(this).val() }, true);
$.ajax({
url: "@Url.Action("GetJsonISOControl", "RiskAssesment")",
dataType: "json",
type: "GET",
data: data,
success: function (data) {
isoList.empty();
$.each(data, function (i, item) {
isoList.append($('<option></option>').val(item.Value).text(item.Text));
});
}
});
});
並且控制器方法需要
public JsonResult GetJsonISOControl(IEnumerable<int> ID)
因為您要發布一個值數組(您將需要調整查詢以適合)。 還請注意,無需創建SelectList
(它只是將多余的數據發送回未使用的客戶端)。 是應該的
var ISOControlList = ISOControlListT.Select(x => new
{
Text = x.Description,
Value = x.ID.ToString(),
});
邊注:
@Html.ListBox("ISOControls", Model.ISOControlList, ..)
正在創建與您的模型沒有關系的控件(它沒有名為ISOControls
的屬性,因此不會綁定到您的模型。我認為應該是
@Html.ListBoxFor(m => m.AssociatedIsoIDs, Model.ISOControlList, ..)
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.