Develop Reference

how to display json data in dropdown using reactj

i need to display data in dropdown i haven given json data with code.
this.setState({
data : [
{id:1,type:A},
{id:1,type:B},
{id:1,type:C},
]
})
<select className="form-control" onChange={(e) => this.handleChange(e)} >
<option >Select data</option>
{
this.state.data.map((i, h) =>
(<option key={h} value={i.type}>{i.type}</option>))
}
</select>

Json isn't correct...put quotation for string type value-"A", "B", "C"
data: [{ id: 1, type: "A" }, { id: 1, type: "B" }, { id: 1, type: "C" }]
JSX
class App extends Component {
state = {
data: [{ id: 1, type: "A" }, { id: 1, type: "B" }, { id: 1, type: "C" }]
};
handleChange = e => {
console.log(e.target.value);
};
render() {
return (
<div>
<select className="form-control" onChange={this.handleChange}>
<option>Select data</option>
{this.state.data.map((i, h) => (
<option key={h} value={i.type}>
{i.type}
</option>
))}
</select>
</div>
);
}
}

Vuejs rendering select dropdown based on first choice in first drop down

I have two drop-down menus. Depending on the choice of the first drop-down the choices of the second need to be filtered and displayed. The first dropdown has a RoomID value that is used to filter an array of objects for the second drop-down menu. When I select a Room in the first dropdown the console log shows the correct data for the second dropdown. however, it is not rendering in the Html. I am not sure why this is not working
Html:
<div id="reports-menu" class="myTextColor1 pl-10">
<div class="row">
<div class="input-field col s12">
<select v-model="selectedRoomID">
<option disabled selected>Rooms</option>
<option v-for="room in rooms" v-bind:value="room.RoomID">{{room.Room}}</option>
</select>
<label>Room:</label>
</div>
</div>
<div class="row">
<div class="input-field col s12">
<select v-model="selectedTopicID">
<option disabled selected>Topics</option>
<option v-for="option in selectedRoom" v-bind:value="option.TopicID">{{option.Topic}}</option>
</select>
<label>Topic:</label>
</div>
</div>
</div>
JS:
var data = <%=return_message%>;
let arrRooms = _.uniqBy(data, function (e) {
return e.Room;
});
let arrTopics = _.uniqBy(data, function (e) {
return e.Topic;
});
let arrDps = _.uniqBy(data, function (e) {
return e.DiscussionPoint;
});
document.addEventListener('DOMContentLoaded', function() {
var elems = document.querySelectorAll('select');
var instances = M.FormSelect.init(elems, {});
});
var chatReportsMenuComponent = new Vue({
el: "#reports-menu",
created: function () {
document.getElementById("reports-menu").style.display = "block";
//GET TOPIC INFO - PASS TOPIC PARAM;
this.initialize();
},
data: {
selectedRoomID: undefined,
rooms:arrRooms,
selectedTopicID: undefined,
topics:arrTopics,
dps:arrDps
},
methods: {
initialize: function () {
var self = this;
}
},
computed:{
selectedRoom: function(){
var filteredTopics = _.filter(arrTopics,{'RoomID': this.selectedRoomID})
console.log("Filterd Topics: ", filteredTopics)
return filteredTopics
}
}
})

I've simplified your code for the sake of ease, but see the below example on how to achieve this (if i've understood your question correctly):
new Vue({
el: "#app",
data() {
return {
selectedRoom: null,
rooms: [
{name: 'room 1', topicId: 1},
{name: 'room 2', topicId: 2},
{name: 'room 3', topicId: 3}
],
topics: [
{id: 1, name: 'topic 1', options: ['one', 'two', 'three']},
{id: 2, name: 'topic 2', options: ['four', 'five', 'six']},
{id: 3, name: 'topic 3', options: ['seven', 'eight', 'nine']}
],
selectedTopicOption: null,
}
},
computed:{
selectedRoomTopic() {
const selected = this.selectedRoom
return (selected)
? this.topics.find(x => x.id === selected.topicId)
: null
}
}
})
<div id="app">
<label>Select a room</label>
<select v-model="selectedRoom">
<option disabled selected>Rooms</option>
<option v-for="room in rooms" :value="room">
{{ room.name }}
</option>
</select>
<div v-if="selectedRoomTopic">
<label>Select a Topic</label>
<select v-model="selectedTopicOption">
<option disabled selected>Topics</option>
<option v-for="option in selectedRoomTopic.options" :value="option">
{{option}}
</option>
</select>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>

angularjs - Change the order of a list with update of the other list entries

I have a Key/Value List with 3 Entries, e.g.
0, Value1
1, Value2
2, Value3
3, Value4
If I change 2 to 0, the entry with index 2 should slip to the position 0 and the additional elements slip around a position to the back.
eg from 0-1-2-3 will then be 2-0-1-3
HTML
<div ng-controller="MyCtrl">
<div class="row-sort" ng-repeat="(key1, value1) in selectList">
<select class="row-select">
<option ng-repeat="(key2, value2) in selectList" value={{key2}} ng-selected="key1 == key2">{{key2}}</option>
</select>
<span class="row-label">{{value1.name}}</span>
</div>
</div>
JavaScript
var myApp = angular.module('myApp', []);
function MyCtrl($scope) {
$scope.selectList = [{
idx: 0,
name: 'Value1'
}, {
idx: 1,
name: 'Value2'
}, {
idx: 2,
name: 'Value3'
}, {
idx: 3,
name: 'Value4'
}]
}
JS Fiddle Link
EDIT 1: It sould work like the jQuery Sortable Plugin, but only with Select-Boxes ...
Jquery Sortable
Anyone a idea how getting this work properly and correct with AngularJS?
Its required for Angular UI Grid (Reorder Columns)
Thank you very much!

You can add to your list selected key to bind it to ng-models for select and use orderBy:
$scope.selectList = [{
idx: 0,
selected: '0',
name: 'Value1'
}, {
idx: 1,
selected: '1',
name: 'Value2'
}, {
idx: 2,
selected: '2',
name: 'Value3'
}, {
idx: 3,
selected: '3',
name: 'Value4'
}];
HTML
<div class="row-sort" ng-repeat="(key1, value1) in selectList | orderBy : 'selected'">
<select class="row-select" ng-model="value1.selected">
<option ng-repeat="(key2, value2) in selectList"
value={{key2}}>{{key2}}</option>
</select>
<span class="row-label">{{value1.name}}</span>
</div>
EDIT
You can write watcher and replace positions for your items:
$scope.$watch(function () {
return $scope.selectList;
},
function (newVal, oldVal) {
var selectedItemId;
var selected;
angular.forEach($scope.selectList, function(item){
if(item.idx !== parseInt(item.selected)){
selectedItemId = item.idx;
selected = item.selected;
}
});
angular.forEach($scope.selectList, function(item){
if(item.selected === selected){
item.selected = ''+selectedItemId;
item.idx = selectedItemId;
selectedItemId = undefined;
selected = undefined;
}
if(item.idx !== parseInt(item.selected)){
item.idx = parseInt(item.selected);
}
});
},true);
Demo Fiddle 2

ng-model returns name of value in place of real value

I have html page using angular.
I have a table with ng-repeat on array:
<tr ng-repeat="oblig in Obligations">
oblig object contains property of chargeOptionId connected to another array ChargeOptions.
Inside the table there is a select element that I want to show details of charge option of oblig.
html code:
<select class="form-control full-width" ng-model="oblig.ChargeOptionId">
<option ng-selected="ch.Id == oblig.ChargeOptionId" value="ch.Id" ng-repeat="ch in ChargeOptions">{{ch.Account}}</option>
</select>
the select element display the charge option details as I want, but when I try saving oblig, oblig.ChargeOptionId="ch.Id" string in place of value of ch.Id.
I tried:
1) using ng-value, but the select did not display the data correctly.
2) ng-options, but still data was not displayed correctly.
how can I fix that problem?

Change
value="ch.Id"
to
value="{{ch.Id}}"
or
ng-value="ch.Id"
The attribute "value" is not an angular directive (like ng-model and ng-value are) so it doesn't know you intend "ch.Id" as a variable.
jsbin

I'm not sure what was failing before, but this seems to work: I used ng-options instead of ng-repeat.
This seemed to do the trick:
angular.module('app', []).controller('Ctrl', function($scope) {
$scope.Obligations = [
{ ChargeOptionId: 1 },
{ ChargeOptionId: 2 },
{ ChargeOptionId: 3 },
{ ChargeOptionId: 4 },
{ ChargeOptionId: 5 },
{ ChargeOptionId: 6 },
{ ChargeOptionId: 7 }
];
$scope.ChargeOptions = [
{ Id: 1, Account: 'Account 1' },
{ Id: 2, Account: 'Account 2' },
{ Id: 3, Account: 'Account 3' },
{ Id: 4, Account: 'Account 4' },
{ Id: 5, Account: 'Account 5' },
{ Id: 6, Account: 'Account 6' },
{ Id: 7, Account: 'Account 7' }
];
$scope.alertSelected = function(idx) {
alert($scope.Obligations[idx].ChargeOptionId);
}
});
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.8/angular.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div ng-app="app" ng-controller="Ctrl">
<div ng-repeat="oblig in Obligations">
<div>
ChargeOption.Id = {{ChargeOptions[$index].Id}} /
Obligation.ChargeOptionId = {{oblig.ChargeOptionId}}
</div>
<select class="form-control full-width"
ng-model="oblig.ChargeOptionId"
ng-options="ch.Id as ch.Account for ch in ChargeOptions">
</select>
<button ng-click="alertSelected($index)">Selected value?</button>
<br /><br />
</div>
</div>

Angularjs Dropdown OnChange Selected Text and Value

I am new to AngularJS and trying to get Selected Text and Value from Dropdown. I followed a lot of tutorials with still unable to get there. SelectedValue and SelectedText are always undefined. Below is my code:
Html:
<div ng-app="SelectApp">
<div ng-controller="selectController">
<select name="category-group" id="categoryGroup" class="form-control" ng-model="itemSelected" ng-change="onCategoryChange(itemSelected)">
<option value="0">Select a category...</option>
<option ng-repeat="category in categories" value="{{category.id}}"
ng-disabled="category.disabled" ng-class="{'mainCategory' : category.disabled}">
{{category.name}}
</option>
</select>
</div>
Js:
'use strict';
var app = angular.module('SelectApp', [ ]);
app.controller('selectController', ['$scope', '$window', function ($scope, $window) {
$scope.categories = [
{ id: 1, name: "- Vehicles -", disabled: true },
{ id: 2, name: "Cars" },
{ id: 3, name: "Commercial vehicles", disabled: false },
{ id: 4, name: "Motorcycles", disabled: false },
{ id: 5, name: "Car & Motorcycle Equipment", disabled: false },
{ id: 6, name: "Boats", disabled: false },
{ id: 7, name: "Other Vehicles", disabled: false },
{ id: 8, name: "- House and Children -", disabled: true },
{ id: 9, name: "Appliances", disabled: false },
{ id: 10, name: "Inside", disabled: false },
{ id: 11, name: "Games and Clothing", disabled: false },
{ id: 12, name: "Garden", disabled: false }
];
$scope.onCategoryChange = function () {
$window.alert("Selected Value: " + $scope.itemSelected.id + "\nSelected Text: " + $scope.itemSelected.name);
};
}]);
And one more thing, I have defined my first item as Select a category... then Why first item in Dropdown is always empty.
Below is my fiddle sample.
http://jsfiddle.net/Qgmz7/136/

That's because, your model itemSelected captures the current value of your select drop down which is nothing but the value attribute of your option element. You have
<option ng-repeat="category in categories" value="{{category.id}}">
in your code, so in the rendered version, you'll get
<option ng-repeat="category in categories" value="0">
but you're expecting itemSelected to be your category object and any attempt to query id or other property will return undefined.
You can use ng-options with group by with little bit of change to your data or you can use normal ng-repeat, get the selectedIndex and lookup the category object from your categories list using that index. Showcasing the first approach here.
HTML
<select name="category-group" id="categoryGroup"
ng-model="itemSelected" ng-change="onCategoryChange(itemSelected)"
ng-options="category.name group by category.group for category in categories">
</select>
Updated Data
$scope.categories = [
{ id: 0, name: "Select a category..."},
{ id: 1, name: "Cars", group : "- Vehicles -" },
{ id: 2, name: "Commercial vehicles", group : "- Vehicles -" },
{ id: 3, name: "Motorcycles", group : "- Vehicles -" }
];
$scope.itemSelected = $scope.categories[0];
Instead of disabled property, you can add a group property which can be used in group by.
Here' an updated Fiddle to illustrate the idea.

You should use ng-options to set object to your ng-model value on change of you select options.
Markup
<select name="category-group" id="categoryGroup" class="form-control"
ng-model="itemSelected" ng-change="onCategoryChange(itemSelected)"
ng-options="category.name for category in categories">
<option value="0">Select a category...</option>
</select>
Fiddle Here
Update
For persisting style you have to use ng-repeat there, in that case you will only have id binded to your ng-model and while retrieving whole object you need to filter your data.
$scope.onCategoryChange = function () {
var currentSelected = $filter('filter')($scope.categories, {id: $scope.itemSelected})[0]
$window.alert("Selected Value: " + currentSelected.id + "\nSelected Text: " + currentSelected.name);
};
Updated Fiddle

<div ng-app="SelectApp">
<div ng-controller="selectController">
<select ng-change='onCategoryChange()' ng-model="itemSelected" ng-options="category.name for category in categories">
<option value="">-- category --</option>
</select>
</div>
//http://jsbin.com/zajipe/edit?html,js,output

A little change in your onCategoryChange() should work:
$scope.onCategoryChange = function () {
$window.alert("Selected Value: " + $scope.categories[$scope.itemSelected - 1].id + "\nSelected Text: " + $scope.categories[$scope.itemSelected -1].name);
};
JSFiddle: http://jsfiddle.net/Qgmz7/144/

ngChange only returns the value of your selected option and that's why you don't get the whole data.
Here's a working solution without changing your markup logic.
Markup:
<select
name="category-group"
id="categoryGroup"
class="form-control"
ng-model="id"
ng-change="onCategoryChange(id)">
ngChange handler:
$scope.onCategoryChange = function (id) {
//get selected item data from categories
var selectedIndex = $scope.categories.map(function(obj) { return obj.id; }).indexOf( parseInt(id) );
var itemSelected = $scope.categories[selectedIndex];
$window.alert("Selected Value: " + itemSelected.id + "\nSelected Text: " + itemSelected.name);
};
Another solution (little bit dirty) would be to change only the value of your options into something like this:
<option .... value="{{category.id}}|{{category.name}}">
...and inside your actual ngChange handler, just split the value to get all the values as an array:
$scope.onCategoryChange = function (itemSelected) {
$scope.itemSelected = itemSelected.split('|'); //string value to array
$window.alert("Selected Value: " + $scope.itemSelected[0] + "\nSelected Text: " + $scope.itemSelected[1]);
};

Here very Simple and easy code What I did
<div ng-app="myApp" ng-controller="myCtrl">
Select Person:
<select ng-model="selectedData">
<option ng-repeat="person in persons" value={{person.age}}>
{{person.name}}
</option>
</select>
<div ng-bind="selectedData">AGE:</DIV>
<br>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl',myCtrlFn);
function myCtrlFn($scope) {
$scope.persons =[
{'name': 'Prabu','age': 20},
{'name': 'Ram','age': 24},
{'name': 'S','age': 14},
{'name': 'P','age': 15}
];
}
</script>