I am trying to implement a generic ASP.net MVC view. The UI should display a list of available and selected items loading data (basically list of string) from server. User can make changes into the list i.e. can select new items from available item list and also can remove items from selected list.
I wanted to do it using KnockoutJS as to take advantage of binding.
I manage to complete it upto the point everything is working except showing selected item as checked when the view is initialized in available list. E.g. As Shown Here
I tried various options (using template (closest to what I want to achieve), Checked attr, possible options), the issue is if I manage to display item checked some other functionality breaks. Tried defining a template but could not get it to work in my case.
HTML:
<div class='moverBoxOuter'>
<div id='contactsList'>
<span data-bind="visible: availableItems().length > 0">Available countries: </span>
<ul data-bind="foreach: availableItems, visible: availableItems().length > 0">
<li>
<input type="checkbox" data-bind="checkedValue: $data, checked: $root.selectedItems" />
<span data-bind="text: title"></span>
</li>
</ul>
<span data-bind="visible: selectedItems().length > 0">Selected countries: </span>
<ul data-bind="foreach: selectedItems, visible: selectedItems().length > 0">
<li>
<span data-bind="text: title"></span>
Delete
</li>
</ul>
</div>
JS:
var initialData = [
{
availableItems: [
{ title: "US", isSelected: true },
{ title: "Canada", isSelected: false },
{ title: "India", isSelected: false }]
},
{
selectedItems: [
{ "title": "US" },
{ "title": "Canada" }
]
}
];
function Item(titleText, isSelected) {
this.title = ko.observable(titleText);
this.isSelected = ko.observable(isSelected);
}
var SelectableItemViewModel = function (items) {
// Data
var self = this;
self.availableItems = ko.observableArray(ko.utils.arrayMap(items[0].availableItems, function (item) {
return new Item(item.title, item.isSelected);
}));
self.selectedItems = ko.observableArray(ko.utils.arrayMap(items[1].selectedItems, function (item) {
return new Item(item.title, item.isSelected);
}));
// Operations
self.selectItem = function (item) {
self.selectedItems.push(item);
item.isSelected(!item.isSelected());
};
self.removeItem = function (removedItem) {
self.selectedItems.remove(removedItem);
$.each(self.availableItems, function (item) {
if (item.title === removedItem.title) {
item.isSelected = false;
}
});
};
}
var vm = new SelectableItemViewModel(initialData);
$(document).ready(function () {
ko.applyBindings(vm);
});
Could you please help, see jsfiddle below:
http://jsfiddle.net/sbirthare/KR4a6/6/
**Update: Follow up question below **
Its followup question:
I need to add a combobox on same UI e.g. for US state. The available items are counties, based on user selection in state combo I need to filter out counties. I am getting data from server using AJAX and its all successful BUT the displayed list is not refreshing. I was expecting having binding setup correctly, if we change the observable array in viewmodel, the UI should change. I tried forcing change to availableItems but it just display all items. Please see if you can spot the problem in below code where I am updating ViewModel observable array.
function multiselect_change() {
console.log("event: openmultiselect_change");
var selectedState = $("#stateDropdownSelect").val();
var propertyName = $("#PropertyName").val();
var searchId = #Model.SearchId;
var items;
var model = { propertyName: propertyName, searchId: searchId, stateName: selectedState };
$.ajax({
url: '#Url.Action("GetFilterValues", "Search")',
contentType: 'application/json; charset=utf-8',
type: 'POST',
dataType: 'html',
data: JSON.stringify(model)
})
.success(function(result) {
debugger;
items = JSON.parse(result);
vm.availableItems(items.AvailableItems);
//vm.availableItems.valueHasMutated();
//var item = document.getElementById('availableItemId');
//ko.cleanNode(item);
//ko.applyBindings(vm, item);
vm.filter(selectedState);
})
.error(function(xhr, status) {
alert(status);
});
}
As user3426870 mentioned, you need to change the value you passed to the checked binding to boolean.
<input type="checkbox" data-bind="checkedValue: $data, checked: isSelected" />
Also, I don't think you need to have selectedItems in the initial data.
Instead in the viewModel, you can do something like:
self.selectedItems = ko.computed(function() {
return ko.utils.arrayFilter(self.availableItems(), function (item) {
return item.isSelected();
});
});
It's because you give an array to the binding checked while it's supposed to be a value comparable to true or false (like undefind or an empty string).
I would use a function checking if the $data is in your array and returning a boolean to your binding.
Something like that!
Related
I am using angularjs for my application.I am using multiple checkbox selection and storing it in database in the format [1,2,3,4,5].For example if the checkbox selected is 1 then i am storing the value as 1.If multiple are selected then 1,2,3, and so on.
Here is the html
<div class="col-xs-12">
<div data-ng-repeat="healthStatus in HealthStatuses">
<input id="chkCustomer_{{healthStatus.Value}}" value="
{{healthStatus.Value}}" type="checkbox"
data-ng-checked="selection.indexOf(healthStatus.Value) > -1"
data-ng-click="toggleSelectionHealthStatus(healthStatus.Value)" />
{{healthStatus.Name}}</label>
</div>
</div>
Here is the controller.js
$scope.HealthStatuses = [{
Name: 'Alzheimers',
Value: 1,
Selected: false
}, {
Name: 'Arthritis',
Value: 2,
Selected: false
},{
Name: 'Cancer',
Value: 3,
Selected: false
},{
Name: 'Cellulitis',
Value: 4,
Selected: false
}];
Here is how i am pushing the selected checkboxes value
$scope.selectionHealthStatus=[];
$scope.toggleSelectionHealthStatus = function toggleSelection(Value) {
var idx = $scope.selectionHealthStatus.indexOf(Value);
if (idx > -1) {
$scope.selectionHealthStatus.splice(idx, 1);
} else {
$scope.selectionHealthStatus.push(Value);
}
};
Now while retrieving the data i want the checkboxes to be checked.But now it is not happening.
Here is how i am retrieving the data
userPageService.getHealthStatus().then((data) => {
data = data.data;
$scope.formData = data;
});
If i put console for $scope.formData this is what i get.
participantIllnessAndDisability:"[1, 2, 3, 4]"
Here participantIllnessAndDisability is one field with multiple checkboxes selected.Now what i want to do is after adding the data while viewing i want the selected checkboxes to be checked.I am getting the data from database in [1,2,3] format.The datatype for field participantIllnessAndDisability in database is String.
At load of page, the function on ng-checked won’t get automatically called. Hence it won’t check the check box.
You could assign ng-model or ng expression to checked property and initialize it from controller on data load.
Update:
Please try this.
userPageService.getHealthStatus().then((data) => {
data = data.data;
$scope.formData = data;
$scope.HealthStatuses.forEach((o) => o.Selected = JSON.parse(data.participantIllnessAndDisability).includes(o.Value));
});
I'm a newbie to AngularJS with some fair knowledge with KnockoutJS also.
I'm trying to implement a search feature on 'products' in my ViewModel that is configurable by the end user by combining..
Search by 'name' of product
Search by 'tags' of product
in combination with search operations
CONTAINS
STARTS WITH
EQUALS
I believe you understood the functionality I am trying to build up.
The following is the ViewModel I'm using.
var InstantSearchController = function ($scope) {
var self = this;
$scope.filtersAvailable = [
{
displayText: 'Tag',
filterMethod: 'tagFilter',
description: 'Filter by Tags'
},
{
displayText: 'Description',
filterMethod: 'descriptionFilter',
description: 'Filter by description'
}
];
$scope.selectedFilter = $scope.filtersAvailable[1];
$scope.filterBehaviorsAvailable = [
{
displayText: 'CONTAINS',
regexPrefix: '',
regexPostfix: ''
},
{
displayText: 'STARTS WITH',
regexPrefix: '^',
regexPostfix: ''
},
{
displayText: 'EQUALS',
regexPrefix: '^',
regexPostfix: '$'
}
];
$scope.selectedFilterBehavior = $scope.filterBehaviorsAvailable[0];
$scope.products = [
{
name: 'Household Product',
description: 'Description household',
tags: ['personal', 'home']
},
{
name: 'Office product',
description: 'Business equipments',
tags: ['office', 'operations', 'business']
},
{
name: 'Misc products',
description: 'Uncategorized items',
tags: ['noclass']
}
];
}
Now, the following is my filters list.
var app = angular.module('InstantSearchModule', []);
//FILTERS BEGIN
app.filter('descriptionFilter', function () {
var filterFunction = function (data, filterBy) {
if (filterBy == null || filterBy === '')
return data;
var filtered = [];
var regExp = new RegExp(filterBy, 'gi');
angular.forEach(data, function (item) {
if (item.description.match(regExp))
filtered.push(item);
});
return filtered;
};
return filterFunction;
});
app.filter('tagFilter', function () {
var tagFilter = function (data, filterBy) {
if (filterBy == null || filterBy === '')
return data;
var filtered = [];
var regExp = new RegExp('^' + filterBy, 'gi');
debugger;
angular.forEach(data, function (item) {
var isMatching = false;
angular.forEach(item.tags, function (t) {
isMatching = isMatching || (t.match(regExp) != null);
});
if (isMatching)
filtered.push(item);
});
return filtered;
};
return tagFilter;
});
// FILTERS END
I have created a working part to configure search criteria including the 'filterString'(in a textbox), search operand[tags or description](with a select list) and a search mode[starts with / contains / equals](with another select list). Both of the filters are working fine if I specify the filter functions (tagFilter or descriptionFilter) directly in AngularJS directives as follows [JSFiddle Here].
<div data-ng-repeat="p in products|tagFilter:filterString|orderBy:'description.length'">
<h4 style="margin-bottom: 5px">{{$index+1}}. {{p.name}}</h4>
<div>
{{p.description}}
<button data-ng-repeat="t in p.tags|orderBy:'toString()'">{{t}}</button>
</div>
</div>
I was expecting the following to work for me as {{selectedFilter.filterMethod}} is rendering the value successfully, but is showing an error. Please see the HTML I tried to use for it.JSFiddle Here
<div data-ng-repeat="p in products|{{selectedFilter.filterMethod}}:filterString|orderBy:'description.length'">
<h4 style="margin-bottom: 5px">{{$index+1}}. {{p.name}}</h4>
<div>
{{p.description}}
<button data-ng-repeat="t in p.tags|orderBy:'toString()'">{{t}}</button>
</div>
</div>
I have attached the error I'm receiving in Google Chrome developer tools along with the resultant HTML to the subject. Please see below.
As you can see in the HTML, the filter method is not resolved and so, its not working for me. Do you guys have an advice what I am doing wrong?
If I understand it correctly all you need is a way to dynamically change filters. Everything else seems to be working.
I dont think you can use the syntax you are trying to use but you can make a third filter that injects the two others and chooses the right one depending on the parameters you send in.
New filter:
app.filter('multiFilter', function (descriptionFilterFilter, tagFilterFilter) {
var filterFunction = function (data, filterBy, filterRegExp, selectedFilter) {
if(selectedFilter.displayText === 'Description') {
return descriptionFilterFilter(data, filterBy, filterRegExp);
}
else {
return tagFilterFilter(data, filterBy, filterRegExp);
}
};
return filterFunction;
});
As you can see it also takes the filterRegExp and the selectedFilter as parameters. I also changed your old filters to take selectedFilter as a parameter.
Also notice that you have to append "Filter" to the filter name in order to inject it.
You call the new filter like this
multiFilter:filterString:filterRegExp:selectedFilter
So the div could loke something like this
<div data-ng-repeat="p in products|multiFilter:filterString:filterRegExp:selectedFilter|orderBy:'description.length'"
title="{{selectedFilter.filterMethod}}">
<h4 style="margin-bottom: 5px">{{$index+1}}. {{p.name}}</h4>
<div>
I made a working fork of your fiddle
Your fiddle is not working and has other error but, the reason filters are not loading is that you have used global controller function and not registered with your app module for the injection to work. Your filter belong to module InstantSearchModule but you controller does not.
Try the module registration syntax
app.controller('InstantSearchController',function($scope) {
});
see the Angular guide on controller https://code.angularjs.org/1.2.15/docs/guide/controller
Update: As it turns out the issue is not with dependency injection. It is because you cannot use expression to dynamically change filter. When i set to fixed filter it works fine
<div data-ng-repeat="p in products|descriptionFilter:filterString|orderBy:'description.length'"
title="{{selectedFilter.filterMethod}}">
You would have to either combine then or find a way to do select filtering.
See my fix here
http://jsfiddle.net/cmyworld/pW9EZ/1/
When a user clicks on a row from a list in the UI (html table tblAllCert), I have a click event that fires to populate another observable array that should populate a second html table (tblCertDetails). My click event fires, I can see data come back, and i can see data in the observable array, but my view does not update.
Here is an overview of the sequence in the code-
1. user clicks on row from html table tblAllCert, which fires selectThing method.
2. In viewmodel code, selectThing passes the row data from the row selected to the GetCertificateDetails(row) method.
3. GetCertificateDetails(row) method calls getCertDetails(CertificateDetails, source) function on my data service (the data service gets data from a web api). getCertDetails(CertificateDetails, source) function returns an observable array.
4. once the data is returned to selectThing, CertificateDetails observable array is populated. It does get data to this point.
Step 5 should be updating the UI (specifically tblCertDetails html table), however the UI does not get updated.
Here is my view-
<table id="tblAllCert" border="0" class="table table-hover" width="100%">
<tbody data-bind="foreach: allCertificates">
<tr id="AllCertRow" style="cursor: pointer" data-bind="click: $parent.selectThing, css: { highlight: $parent.isSelected() == $data.lwCertID }">
<td>
<ul style="width: 100%">
<b><span data-bind=" text: clientName"></span> (<span data-bind=" text: clientNumber"></span>) <span data-bind=" text: borrowBaseCount"></span> Loan(s) </b>
<br />
Collateral Analyst: <span data-bind=" text: userName"></span>
<br />
Certificate: <span data-bind="text: lwCertID"></span> Request Date: <span data-bind=" text: moment(requestDate).format('DD/MMM/YYYY')"></span>
</td>
</tr>
</tbody>
</table>
<table id="tblCertDetails" border="0" class="table table-hover" width="100%">
<tbody data-bind="foreach: CertificateDetails">
<tr id="Tr1" style="cursor: pointer">
<td>
<ul style="width: 100%">
<b>Loan: <span data-bind=" text: loanNum"></span>
</td>
</tr>
</tbody>
</table>
My viewmodel-
define(['services/logger', 'durandal/system', 'durandal/plugins/router', 'services/CertificateDataService'],
function (logger, system, router, CertificateDataService) {
var allCertificates = ko.observableArray([]);
var myCertificates = ko.observableArray([]);
var isSelected = ko.observable();
var serverSelectedOptionID = ko.observable();
var CertificateDetails = ko.observableArray([]);
var serverOptions = [
{ id: 1, name: 'Certificate', OptionText: 'lwCertID' },
{ id: 2, name: 'Client Name', OptionText: 'clientName' },
{ id: 3, name: 'Client Number', OptionText: 'clientNumber' },
{ id: 4, name: 'Request Date', OptionText: 'requestDate' },
{ id: 5, name: 'Collateral Analyst', OptionText: 'userName' }
];
var activate = function () {
// go get local data, if we have it
return SelectAllCerts(), SelectMyCerts();
};
var vm = {
activate: activate,
allCertificates: allCertificates,
myCertificates: myCertificates,
CertificateDetails: CertificateDetails,
title: 'Certificate Approvals',
SelectMyCerts: SelectMyCerts,
SelectAllCerts: SelectAllCerts,
theOptionId: ko.observable(1),
serverOptions: serverOptions,
serverSelectedOptionID: serverSelectedOptionID,
SortUpDownAllCerts: SortUpDownAllCerts,
isSelected: isSelected,
selectThing: function (row, event) {
CertificateDetails = GetCertificateDetails(row);
isSelected(row.lwCertID);
}
};
serverSelectedOptionID.subscribe(function () {
var sortCriteriaID = serverSelectedOptionID();
allCertificates.sort(function (a, b) {
var fieldname = serverOptions[sortCriteriaID - 1].OptionText;
if (a[fieldname] == b[fieldname]) {
return a[fieldname] > b[fieldname] ? 1 : a[fieldname] < b[fieldname] ? -1 : 0;
}
return a[fieldname] > b[fieldname] ? 1 : -1;
});
});
return vm;
function GetCertificateDetails(row) {
var source = {
'lwCertID': row.lwCertID,
'certType': row.certType,
}
return CertificateDataService.getCertDetails(CertificateDetails, source);
}
function SortUpDownAllCerts() {
allCertificates.sort();
}
function SelectAllCerts() {
return CertificateDataService.getallCertificates(allCertificates);
}
function SelectMyCerts() {
return CertificateDataService.getMyCertificates(myCertificates);
}
});
And releveant excerpt from my data service-
var getCertDetails = function (certificateDetailsObservable, source) {
var dataObservableArray = ko.observableArray([]);
$.ajax({
type: "POST",
dataType: "json",
url: "/api/caapproval/CertDtlsByID/",
data: source,
async: false,
success: function (dataIn) {
ko.mapping.fromJSON(dataIn, {}, dataObservableArray);
},
error: function (error) {
jsonValue = jQuery.parseJSON(error.responseText);
//jError('An error has occurred while saving the new part source: ' + jsonValue, { TimeShown: 3000 });
}
});
return dataObservableArray;
}
Ideas of why the UI is not updating?
When you're using Knockout arrays, you should be changing the contents of the array rather than the reference to the array itself. In selectThing, when you set
CertificateDetails = GetCertificateDetails(row);
the new observableArray that's been assigned to CertificateDetails isn't the same observableArray that KO bound to your table.
You're very close to a solution, though. In your AJAX success callback, instead of creating a new dataObservableArray and mapping into that, you can perform the mapping directly into parameter certificateDetailsObservable. ko.mapping.fromJSON should replace the contents of the table-bound array (you would also get rid of the assignment in selectThing).
I'm fairly new to knockout.js, however, I've been happily using it in my ASP.NET MVC 4 project, until I ran into this obstacle which has been bothering me for a while, can't seem to put my finger on it.
The scenario which I'm working on requires several combinations of location data (region, country, city), i.e. cascading dropdown lists, which isn't a problem to do when inputting fresh data, but I ran into problem(s) when trying to edit the saved data.
Data is in JSON format, with nested arrays, looks like this (shortened for illustration purposes):
var newData =
[
{
"ID":1,
"Name":"Australia and New Zealand",
"Countries":[
{
"ID":13,
"Name":"Australia",
"Cities":[
{
"ID":19,
"Name":"Brisbane"
},
{
"ID":28,
"Name":"Cairns"
},
...
I suspect I can't load the data (or more clearly, to bind it) properly since I'm having trouble accessing the Region sub-array (which contains Region's Countries) and the Countries sub-array (which contains Countries' Cities).
Then there's the matter of having prepopulated options, which works partially, the viewmodel loads the number of lines, but doesn't select anything.
Here's the VM:
var existingRows = [
{
"Region": 1,
"Country": 13,
"City": 19
},
{
"Region": 1,
"Country": 158,
"City": 3
}];
var Location = function (region, country, city) {
var self = this;
self.region = ko.observable(region);
self.country = ko.observable(country);
self.city = ko.observable(city);
// Whenever the region changes, reset the country selection
self.region.subscribe(function () {
self.country(undefined);
});
// Whenever the country changes, reset the city selection
self.country.subscribe(function () {
self.city(undefined);
});
};
var LocationViewModel = function (data) {
var self = this;
self.lines = ko.observableArray(ko.utils.arrayMap(data, function (row)
{
var rowRegion = ko.utils.arrayFirst(newData, function (region)
{
return region.ID == row.Region;
});
var rowCountry = ko.utils.arrayFirst(rowRegion.Countries, function (country) {
return country.ID == row.Country;
});
var rowCity = ko.utils.arrayFirst(rowCountry.Cities, function (city) {
return city.ID == row.City;
});
return new Location(rowRegion, rowCountry, rowCity);
}));
// Operations
self.addLine = function () {
self.lines.push(new Location())
};
self.removeLine = function (line) {
self.lines.remove(line)
};
};
var lvm = new LocationViewModel(existingRows);
$(function () {
ko.applyBindings(lvm);
});
HTML code:
<tbody data-bind="foreach: lines">
<tr>
<td><select data-bind="options: newData, optionsText: 'Name', optionsValue: 'ID', optionsCaption: 'Select a region...', attr: { name: 'SubRegionIndex' + '['+$index()+']' }, value: region"></select></td>
<td><select data-bind="options: Countries, optionsText: 'Name', optionsValue: 'ID', optionsCaption: 'Select a country...', attr: { name: 'CountryIndex' + '['+$index()+']' }, value: country"></select></td>
<td><select data-bind="options: Cities, optionsText: 'Name', optionsValue: 'ID', optionsCaption: 'Select a city...', attr: { name: 'CityIndex' + '['+$index()+']' }, value: city"></select></td>
<td><a href='#' data-bind='click: $parent.removeLine'>Remove</a></td>
</tr>
</tbody>
I tried to modify the Cart editor example from the knockout.js website with prepopulated data, but haven't really made much progress, I seem to be missing something. Didn't really find anything with nested arrays so I'm stuck here...
I've put up the full code on JSFiddle here:
http://jsfiddle.net/fgXA2/1/
Any help would be appreciated.
The problem is the way in which you are binding to the selected item in your select lists:
<select data-bind="
options: newData,
optionsText: 'Name',
optionsValue: 'ID',
value: region">
</select>
Here you are binding the ID property from your JSON data to the region property on your view model.
This means that when you bind your second select list:
<td data-bind="with: region">
<select data-bind="
options: Countries,
optionsText: 'Name',
optionsValue: 'ID',
value: $parent.country">
</select>
</td>
You attempt to bind to region.Countries. However, region simply contains the selected region ID. In this case the console is your friend:
Uncaught Error: Unable to parse bindings. Message: ReferenceError:
Countries is not defined;
The same problem is true of your third select list for Cities since you are now attempting to bind to country.Cities where country is also just the ID.
There are two options available here. The first is to remove the optionsValue parameters, thus binding the actual JSON objects to your view model properties. That and a binding error on your Cities select box (you were binding to CityName instead of Name) were the only problems:
http://jsfiddle.net/benfosterdev/wHtRZ/
As you can see from the example I've used the ko.toJSON utility to output your view model's object graph. This can be very useful in resolving problems (in your case you would have seen that the region property was just an number).
The downside of the above approach is that you end up storing a copy of all of the countries, and their cities for the selected country in your view model.
A better solution if dealing with large data sets would be to only store the selected identifier (which I believe you were attempting to do originally) and then define computed properties that filter your single data set for the required values.
An example of this can be seen at http://jsfiddle.net/benfosterdev/Bbbt3, using the following computed properties:
var getById = function (items, id) {
return ko.utils.arrayFirst(items, function (item) {
return item.ID === id;
});
};
this.countries = ko.computed(function () {
var region = getById(this.selectedRegion.regions, this.selectedRegion());
return region ? ko.utils.arrayMap(region.Countries, function (item) {
return {
ID: item.ID,
Name: item.Name
};
}) : [];
}, this);
this.cities = ko.computed(function () {
var region = getById(this.selectedRegion.regions, this.selectedRegion());
if (region) {
var country = getById(region.Countries, this.selectedCountry());
if (country) {
return country.Cities;
}
}
}, this);
You can see from the rendered object graph that only the currently selected countries and cities are copied to the view model.
After reviewing many tutorials and various approaches to Cascading DropDownLists, I decided to create a ViewModel for my View and then populate my DropDownLists based on this post:
MVC3 AJAX Cascading DropDownLists
The goal here is the most basic and covered in many tutorials, but I still can't get it quite right... to populate a City dropdown based on the value of a State dropdown.
EDIT:
Since posting this request for help, I discovered Firebug (yes, that's how new I am to doing any sort of programming), and I was able to determine that I am successfully calling my controller, and pulling the necessary data. I believe the problem is the second half of my JavaScript that returns the data to my View.
Here is my View:
<label>STATE HERE:</label>
#Html.DropDownListFor(x => x.States, Model.States, new { #class = "chzn-select", id = "stateID" })
<br /><br />
<label>CITY HERE:</label>
#Html.DropDownListFor(x => x.Cities, Enumerable.Empty<SelectListItem>(), new { id = "cityID" })
Here is the JavaScript within my View, and somehow I'm not handling my results correctly once I get them:
$(function () {
$("#stateID").change(function () {
var stateId = $(this).val();
// and send it as AJAX request to the newly created action
$.ajax({
url: '#Url.Action("GetCities")',
type: 'GET',
data: { Id: stateId },
cache: 'false',
success: function (result) {
var citySelect = $('#cityID');
$(citySelect).empty();
// when the AJAX succeeds refresh the ddl container with
$.each(result, function (result) {
$(citySelect)
.append($('<option/>', { value: this.simpleCityID })
.text(this.cityFull));
});
},
error: function (result) {
alert('An Error has occurred');
}
});
});
});
Here is my controller called by the JavaScript:
public JsonResult GetCities(int Id)
{
return Json(GetCitySelectList(Id), JsonRequestBehavior.AllowGet);
}
private SelectList GetCitySelectList(int Id)
{
var cities = simpleDB.simpleCity.Where(x => x.simpleStateId == Id).ToList();
SelectList result = new SelectList(cities, "simpleCityId", "cityFull");
return result;
}
Here are my results from Firbug, which tell me I'm building and getting the data without issue, just not populating my DropDownList correctly:
[{"Selected":false,"Text":"Carmel","Value":"IN001"},{"Selected":false,"Text":"Fishers","Value":"IN002"}]
If anyone has any suggestions as to why the JavaScript fails to populate the dropdrown, please comment, thanks!
I have done this several times with something like this:
Create a partial to popolate dropdown list. Name it DropDownList and put in Shared folder of Views
#model SelectList
#Html.DropDownList("wahtever", Model)
Your create view should be something like this (skipped irrelevant parts)
<script type="text/javascript">
$(function() {
$("#StateId").change(function() {
loadLevelTwo(this);
});
loadLevelTwo($("#StateId"));
});
function loadLevelTwo(selectList) {
var selectedId = $(selectList).val();
$.ajax({
url: "#Url.Action("GetCities")",
type: "GET",
data: {stateId: selectedId},
success: function (data) {
$("#CityId").html($(data).html());
},
error: function (result) {
alert("error occured");
}
});
}
</script>
#Html.DropDownList("StateId")
<select id="CityId" name="CityId"></select>
Carefully note the Empty Select item for CityId and the call of loadLevelTwo at document.ready
And your controller should be like:
public ActionResult Create()
{
ViewBag.StateId = new SelectList(GetAllCities(), "Id", "Name");
return View();
}
public ActionResult GetCities(int stateId) {
SelectList model = new SelectList(GetCitiesOfState(stateId), "Id", "Name");
return PartialView("DropDownList", model);
}
Thank you for your assistance,
It turns out that in my JavaScript below, I was attempting to directly reference the simpleCityID and cityFull fields associated with my data model:
$.each(result, function (result) {
$(citySelect)
.append($('<option/>', { value: this.simpleCityID })
.text(this.cityFull));
Instead, I needed to keep it generic and inline with JavaScript standards of referencing Value and Text:
$.each(modelData, function (index, itemData) {
select.append($('<option/>', {
value: itemData.Value,
text: itemData.Text