Develop Reference

Populate Dynamic DropDownListFor in Javascript

I have a couple of drop down lists... The first of which has an onchange event that calls a Javascript funcction:
#for (int i = 0; i < Model.things.Count; i++)
{
<tr>
<td>
#Html.DropDownListFor(m => m.Category[i].ID, ViewBag.Category as SelectList, "Please select a Category", new { #class = "class1", onchange = "Changed(this)" })
</td>
<td>
#Html.DropDownListFor(m => m.SubCategory[i].ID, Enumerable.Empty<SelectListItem>(), "Please select a Sub Category", new { #class = "class2" })
</td>
</tr>
}
Within this function I am making an ajax call to a controller method that returns a SelectList:
function TrackerChanged(val) {
var id = val.value;
$j.ajax({
url: appRoot + 'Controller/Method',
type: 'post',
data: { 'id': id},
success: function (results) {
if (results) {
**** POPULATE SECOND DROPDOWN ABOVE ***
}
else {
alert("Error updating comment");
}
},
failure: function () {
alert("Error updating comment");
}
});
}
The Controller Method returns a SelectList:
public SelectList Method(id categoryID)
{
IEnumerable<SelectListItem> select = null;
// Populate the IEnumerable with SubCategory results to show in the second Drop Down
return new SelectList(select, "Value", "Text");
}
but as you may notice from the comment in my ajax success chunk - I do not know how I would bind my new results back to the controller.
Please can someone help. I have looked for some examples and nothing seems to be working for me.

I want to cascade multiple Dropdown lists using mvc 4 razor in ASP.NET

In this MVC application I've created cascading dropdown list i.e it will first populate countries list and after selecting country jquery's onchange event is called which will fetch the further states from the controller which further gets those data by edmx entity model in database.i have used ajax request to call the JSON method in this.After selecting states the new dropdown list would get activated for selecting Cities.Whenever I select countries from the drop down an alertbox pops out and says states retrieving failed.[object][object] also I didn't create relationship between tables as foreign key is that necessary
Location Controller:-
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
namespace MvcApplication3.Controllers
{
public class LocationController : Controller
{
//
// GET: /Location/
public ActionResult Index()
{
TestDBEntities db = new TestDBEntities();
ViewBag.Country = new SelectList(db.tblCountries, "CountryID", "CountryName");
return View();
}
public JsonResult GetState(string id)
{
List<SelectListItem> states = new List<SelectListItem>();
var stateList = this.Getstatevalue(Convert.ToInt32(id));
var stateData = stateList.Select(m => new SelectListItem()
{
Text = m.StateName,
Value = m.StateID.ToString(),
});
return Json(stateData, JsonRequestBehavior.AllowGet);
}
public IList<tblState> Getstatevalue(int CountryId)
{
TestDBEntities db = new TestDBEntities();
return db.tblStates.Where(m => m.CountryID == CountryId).ToList();
}
public JsonResult GetCity(string id)
{
List<SelectListItem> cities = new List<SelectListItem>();
var cityList = this.Getcityvalue(Convert.ToInt32(id));
var cityData = cityList.Select(m => new SelectListItem()
{
Text = m.CityName,
Value = m.CityID.ToString(),
});
return Json(cityData, JsonRequestBehavior.AllowGet);
}
public IList<tblCity> Getcityvalue(int StateId)
{
TestDBEntities db = new TestDBEntities();
return db.tblCities.Where(m => m.StateID == StateId).ToList();
}
}
}
Index.cshtml view
#{
ViewBag.Title = "Index";
}
<h2>Index</h2>
#using (Html.BeginForm())
{
#Html.ValidationSummary(true)
<fieldset>
<legend>EmployeeData</legend>
<div class="editor-label">
#Html.Label("Country")<br />
</div>
<div>
#Html.DropDownList("Country", ViewBag.Country as SelectList, "-- Please Select a Country --", new { style = "width:150px", #id = "Country" })
</div>
<div class="editor-label">
<br />
#Html.Label("State")<br />
</div>
<div>
#Html.DropDownList("State", new SelectList(string.Empty, "Value", "Text"), "-- Please select a State --",
new { style = "width:150px", #class = "dropdown1" })
</div>
<div class="editor-label">
<br />
#Html.Label("City")<br />
</div>
<div>
#Html.DropDownList("City", new SelectList(string.Empty, "Value", "Text"), "-- Please select a city --",
new { style = "width:150px", #class = "dropdown2", #id = "City" })
</div>
<p>
<input type="button" onclick="ddlInsert()" value="Submit" />
</p>
</fieldset>
}
javascript code :
<script type="text/javascript">
$(document).ready(function () {
// this is Country Dropdown Selectedchange event
$("#Country").change(function () {
$("#State").empty();
$.ajax({
type: 'POST',
url: '#Url.Action("Getstates")', // here we are Calling json method
dataType: 'json',
data: { id: $("#Country").val() },
// Get Selected Country ID.
success: function (states) {
$.each(states, function (i, state) {
$("#State").append('<option value="' + state.Value + '">' +
state.Text + '</option>');
});
},
error: function (ex) {
alert(' states retrieving fail.' + ex);
}
});
return false;
})
$("#State").change(function () {
$("#City").empty();
$.ajax({
type: 'POST',
url: '#Url.Action("GetCities")', // here we are Calling json method
dataType: 'json',
data: { id: $("#State").val() },
// Get Selected Country ID.
success: function (cities) {
$.each(cities, function (i, city) {
$("#City").append('<option value="' + city.Value + '">' +
city.Text + '</option>');
});
},
error: function (ex) {
alert(' city retrieving fail.' + ex);
}
});
return false;
})
});
</script>
When I select a country in it No state gets loaded or populated into the dropdown list for states.

Mvc Ajax post from check-boxes in partial view

I have a partial view which is used to show a checkbox in a column of table in razor. When I click on any checkbox in the table its posting back to controller with Id of first row and not the Id of row in which the check-box is contained. The javascript function to post ajax request is "SaveChanges" as given below.
The hidden field "RecurrenceScheduleId" is the primary key id.
Am I doing something wrong here?
- Following are my view & controller action:
#model SMRDS.Model.RecurrenceSchedule
#using (Ajax.BeginForm("_LogOccurancePartial", "Schedule",
new AjaxOptions
{
UpdateTargetId = "tdOccurance",
HttpMethod = "post",
LoadingElementId = "btnProgress",
OnBegin = "dialogBegin",
OnSuccess = "updateSuccess",
OnFailure = "dialogFailure"
},
new { id = "frm-toggle" }))
{
#Html.HiddenFor(model => model.RecurrenceScheduleId)
#Html.CheckBoxFor(m => m.LogOccurences, new { #onclick ="SaveChanges(this)" })
}
<script>
function updateSuccess() {}
function dialogFailure() {}
function dialogComplete() {}
function dialogBegin() {}
function SaveChanges(checkboxInput) {
$.ajax({
type: 'POST',
url: '/Schedule/_LogOccurancePartial',
data: { newValue: checkboxInput.checked, id: $("#RecurrenceScheduleId").val() },
dataType: 'json',
success: function (response) {
//handle success
}
});
}
Controller Action :
public JsonResult _LogOccurancePartial(bool newValue,int id)
{
var result = BLL.Service.RecurrenceSchedules.UpdateLogOccurence(id, newValue);
return Json(new { result = result }, JsonRequestBehavior.AllowGet);
}
Update
Following is the html rendered for hidden fields. At present I have only two rows with Ids "40" & "41".
<input data-val="true" id="RecurrenceScheduleId"
name="RecurrenceScheduleId" type="hidden" value="40">
<input data-val="true" id="RecurrenceScheduleId"
name="RecurrenceScheduleId" type="hidden" value="41">

It is your responsibility to maintain unique ids when you use the helpers.
If you had a model
public class ViewModel
{
public int Id { get; set; }
public string Name { get; set; }
}
And your view contains a collection you can use a for loop with an index to override the id with unique values.
#model List<ViewModel>
#for(int i = 0; i < Model.Count(); i++)
{
#Html.HiddenFor(m => Model[i].Id, htmlAttributes: new { id = "item" + item.Id })
}
But you can also adjust your click handler so you don't need to find a hidden input by id.
#Html.CheckBoxFor(m => m.LogOccurences,
new { #class="trigger", data_rsid=m.RecurrenceScheduleId })
<script>
$("body").on("click", ".trigger", function(e) {
var rsId = $(this).data("rsid");
var checked = $(this).prop("checked");
var data = { newValue: checked, id: rsId }
$.ajax({ ... });
});
</script>

How to implement search with two terms for a collection?

So, currently I have a collection of items where I want the user to be able to search using the name and some random text from the collection.
Here's what I have done so far:
public IEnumerable<Item> items = new[]
{
new Item { ItemId = 1, ItemName = "Apple", ItemDescription = "crispy, sweet", ItemPairing = "Walnut"},
new Item { ItemId = 2, ItemName = "Pear", ItemDescription = "slightly tart", ItemPairing = "Cheese"},
new Item { ItemId = 3, ItemName = "Banana", ItemDescription = "good source of potassium", ItemPairing = "Honey" },
new Item { ItemId = 4, ItemName = "Chocolate", ItemDescription = "Sweet and rich melting flavor", ItemPairing = "Wine"}
};
public ActionResult Index()
{
return View("Index");
}
public ActionResult Search(string search)
{
return View("Index", items.Where(n => n.ItemName.StartsWith(search)));
}
Here's the search part on the view:
<p>
<b>Search for Name:</b>
#Html.TextBox("ItemName", "", new { #class = "form-control" })
<b>Search for Text:</b>
#Html.TextBox("ItemText", "", new { #class = "form-control" })
<input id="search" type="submit" value="Search" onclick="search(ItemName,ItemText)" />
</p>
<script>
function search(ItemName, ItemText) {
$("search").click(function () {
$.ajax({
type: "POST",
url: "/Items/Search",
data: {ItemName, ItemText},
datatype: "html",
success: function (data) {
$('#result').html(data);
}
});
});
}
</script>
So that it can look something like this:
I want it so that when the user types in Apple for Name and Crispy for text, they can find the Apple item from my collection. I also want it so that if they type in either Name or Text, it will still return a matched item.
I'm not sure how to do that.

Remove the onclick attribute from the submit button and change it to
<button type="button" id="search">Search</button>
and change the script to
var url = '#Url.Action("Search", "Items")';
$("#search").click(function () {
$.post(url, { ItemName: $('#ItemName').val(), ItemText: $('#ItemText').val() }, function(data) {
$('#result').html(data);
});
})
Note you may want to consider making it $.get() rather than $.post()
and change the controller method to accept the inputs from both textboxes
public PartialViewResult Search(string itemName, string itemText)
{
var items = ??
// filter the data (adjust to suit your needs)
if (itemName != null)
{
items = items.Where(x => x.ItemName.ToUpperInveriant().Contains(itemName.ToUpperInveriant())
}
if (itemText != null)
{
items = items.Where(x => x.ItemDescription.ToUpperInveriant().Contains(itemText.ToUpperInveriant())
}
// query you data
return PartialView("_Search", items);
}
Side note: Its not clear what the logic for search is - i.e. if you enter search text in both textboxes, do you want an and or an or search
Assuming the view in the view in the question is Index.cshtml, then it will include the following html
<div id="result">
#Html.Action("Search") // assumes you want to initially display all items
</div>
and the _Search.cshtml partial would be something like
#model IEnumerable<Item>
#foreach (var item in Model)
{
// html to display the item properties
}

While CStrouble's answer will work, if you're into AJAX calls and want to sort this in a single page, you might consider using AJAX and JQuery calls.
With AJAX & JQuery:
var search = function(itemName, itemText) {
//note that if you want RESTful link, you'll have to edit the Routing config file.
$ajax.get('/controller/action/itemName/itemText/', function(res) {
//do stuff with results... for instance:
res.forEach(function(element) {
$('#someElement').append(element);
});
});
};
And the action:
public JsonResult SearchAction(itemName, itemText) {
List<Item> newItems = items.Where(x => x.ItemName.ToUpperInveriant().Contains(itemName.ToUpperInveriant())
|| x.ItemDescription.ToUpperInveriant().Contains(itemText.ToUpperInveriant())
|| x.ItemPairing.ToUpperInveriant().Contains(itemText.ToUpperInveriant()));
return Json.Encode(newItems.ToArray());
}
Note that I'm not home, so there might be some syntax errors.
Alright, so say I want to return a partial, instead of a simple array:
first, change the action to:
public ActionResult SearchAction(itemName, itemText) {
List<Item> newItems = items.Where(x => x.ItemName.ToUpperInveriant().Contains(itemName.ToUpperInveriant())
|| x.ItemDescription.ToUpperInveriant().Contains(itemText.ToUpperInveriant())
|| x.ItemPairing.ToUpperInveriant().Contains(itemText.ToUpperInveriant()));
return PartialView("~/Views/Partials/MyPartialView.cshtml", newItems);
}
And you create a partial view in the directory you specified, taking the model that you transferred (newItems)
#model IEnumerable<Path.to.Item>
<h3>Results</h3>
<ul>
#foreach(var item in model)
{
<li>#item.Name - #item.Description</li>
}
</ul>
and now when you receive the jquery response:
$.ajax({
type: "POST",
url: "/Items/Search",
data: {ItemName, ItemText},
datatype: "html",
success: function (data) {
$('#result').html(data);
}
});
//since data is the HTML partial itself.
//if you have firebug for Mozilla firefox, you can see what I'm
//talking about

You may want to consider converting both strings to upper or lower, depending on your search requirements. The below code assumes the search is case-insensitive.
public ActionResult Search(string search)
{
string upperSearch = search.ToUpperInvariant();
return View("Index", items.Where(n =>
n.ItemName.ToUpperInvariant().StartsWith(search) ||
n.ItemDescription.ToUpperInvariant().Contains(search)));
}
with the Or condition it will match if either the text or the name matches. If they match different items (like Apple and Tart), you may need to consider what happens in that use-case, but in this case it will return both Apple and Pear.

Populate second model in same view in MVC : Prevent postback

I have a page in MVC, where i need to display the details of the records.
The records needed to be fetched from 2 tables for which i have Model separately.
Now, for this page needing both the models, I have created another model which have those 2 model referred.
[Please note, following nomenclature's are only for example purposes.]
public class CombinedModel
{
public Model1 objModel1 { get; set; }
public Model2 objModel2 { get; set; }
}
In the view [Details.cshtml], I have following code:
#model Application.Web.Models.CombinedModel
<div>
#Html.Label("Label text: ", htmlAttributes: new { #class = "control-label" })
#Html.DisplayFor(model => model.objModel1.Property1, new { htmlAttributes = new { #class = "form-control" } })
</div>
And a popup code
<div id="Modal">
<div>
#Html.Label("Popup label text:", htmlAttributes: new { #class = "control-label" })
#Html.DisplayFor(vmodel => vmodel.objModel2.Property2, new { htmlAttributes = new { #class = "form-control" } })
</div>
</div>
The page loads with the data in from the first model successfully from controller action.
I needed Data in the popup code, only when user clicks on particular record, from where View will send ID and will display record for that particular ID from the second model.
In Controller:
public class ControllerNameController : Controller
{
[HttpGet]
[OutputCache(NoStore = true, Duration = 0, VaryByParam = "None")]
[ValidateInput(false)]
public ActionResult Details(int? Id, string strType, string strVersionID)
{
var Details1 = db.Table1.FirstOrDefault(rd => rd.SomeID == Id);
CombinedModel modelCombined = new CombinedModel();
Model1 objectM1 = new Model1();
objectM1.Property1 = Details1.Column1;
var VersionDetails = db.Table2.FirstOrDefault(rvd => rvd.somePrimaryKeyID == Convert.ToInt32(strVersionID));
if (VersionDetails != null)
{
Model2 objectM2 = new Model2();
objectM2.vCreatedOn = VersionDetails.Property2;
modelCombined.objModel2 = objectM2;
ViewBag.VersionID = VersionDetails.VersionID;
}
modelCombined.objModel1 = objectM1;
return View(rmodel);
}
}
The page landing URL is:
function JavascriptFunctionInParentView(IDToPass, strTypeToPass)
{
top.location.href = "#Url.Action("Details", "ControllerName")"
+ "?Id=" + IDToPass
+ "&strType='" + strTypeToPass + "'"
+ "&strVersionID='0'";
}
SO, when first time page loads, we have strVersionID as Zero. So, it will not enter in VersionDetails block and fill only Model1 data.
Now, when we are Details page, there is a grid, from which, I need to populate the version details in the popup, for which I have working code as following:
function recordDoubleClickRuleVersion(args) {
top.location.href = "#Url.Action("Details", "ControllerName")"
+ "?Id=" + #Url.RequestContext.HttpContext.Request.QueryString["Id"]
+ "&strType=" + '#Url.RequestContext.HttpContext.Request.QueryString["strType"]'
+ "&strVersionID=" + args.data.VersionID;
}
// ....
$(function () {
if ('#(ViewBag.VersionID)' == "") {
$("#Modal").ejDialog("close");
}
if ('#(ViewBag.VersionID)' != "") {
$("#Modal").ejDialog(
{ enableModal: true, enableResize: false, close: "onDialogClose", width: "60%" });
$("#Modal").ejDialog("open");
}
})
My problem is, when i call this Version details popup, page postbacks and then data comes.. I know i have given #Url.Action to it so it is behaving like this way.
I needed it to be by complete Client-side code and I tried following code as well. It open's popup but doesn't fill value in it.
$.ajax({
type: "GET",
data: ({
"Id": #Url.RequestContext.HttpContext.Request.QueryString["Id"],
"strType": '#Url.RequestContext.HttpContext.Request.QueryString["strType"]',
"strVersionID": args.data.VersionID }),
url: '#Url.Action("RuleDetails", "Rules")',
})
.done(function (RuleVersionDetails) {
// 1. Set popup
$("#Modal").ejDialog(
{ enableModal: true, enableResize: false, close: "onDialogClose", width: "60%" });
// 2. Open popup
$("#Modal").ejDialog("open");
});
Can you please tell me the solution for this ?

You can change you Details() Action to return a Json object, and then fill the dialog with it.
$.ajax({
type: "GET",
data: ({
"Id": #Url.RequestContext.HttpContext.Request.QueryString["Id"],
"strType": '#Url.RequestContext.HttpContext.Request.QueryString["strType"]',
"strVersionID": args.data.VersionID }),
url: '#Url.Action("RuleDetails", "Rules")',
})
.done(function (jsonData) {
// **TODO: file dialog with properties of jsonData**
// 1. Set popup
$("#Modal").ejDialog(
{ enableModal: true, enableResize: false, close: "onDialogClose", width: "60%" });
// 2. Open popup
$("#Modal").ejDialog("open");
});

The best approach for your case is using bootstrap modal.Go here and check its documentation and how to config. If you aren't familiar with bootstrap or modal, it really worth to learn.
But remember when you want sent data to modal section, make it dynamic based on your item id in grid.