AngularJS: $ watch selected input
I know that we can use ng-change to solve this problem, but I would like to understand why $ watch does not work when selected. Maybe I am doing something wrong, but it seems that I am not the only one who can fight this. Here is my code:
HTML:
<div class="list">
<label class="item item-input item-select">
<div class="input-label">
Serveur
</div>
<select ng-model="server" ng-options="s as s.label for s in serverschoice">
</select>
</label>
</div>
JS:
.controller('SettingsCtrl', function ($scope, $log, serverSelection) {
//List of servers to connect to
$scope.serverschoice = serverSelection.servers;
$scope.server = serverSelection.server;
$scope.$watch('server', function(NewValue, OldValue) {
serverSelection.server = NewValue;
$scope.url = serverSelection.url;
}, true);
})
.service("serverSelection", function() {
var self = this;
self.servers = [
{ label: 'Production', value: 1, url: 'url1' },
{ label: 'Training', value: 2, url: 'url2' },
{ label: 'Local', value: 3, url: 'url2' }
];
self.server = self.servers[1];
console.log(self.server);
self.url = self.server.url;
})
Thank...
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In order for it to work, you need to make a few changes in your code, you need to put all the server-related information into one named object self.serverInfo
that will contain information about server
and servers
, directly linking this to the scope variable will automatically update the binding in consistent with JavaScript prototypal inheritance.
Html
<body ng-controller="SettingsCtrl">
<div class="list">
<label class="item item-input item-select">
<div class="input-label">
Server
</div>
{{serverInfo}}
<select ng-model="serverInfo.server"
ng-options="s as s.label for s in serverInfo.servers">
</select>
</label>
</div>
</body>
controller
var app = angular.module('app',[]);
app.controller('SettingsCtrl', function ($scope, $log, serverSelection) {
//List of servers to connect to
$scope.serverInfo= serverSelection.serverInfo;
$scope.$watch('serverInfo.server', function(NewValue, OldValue) {
$scope.url = $scope.serverInfo.server.url;
}, true);
})
app.service("serverSelection", function() {
var self = this;
self.serverInfo = {};
self.serverInfo.servers = [
{ label: 'Production', value: 1, url: 'url1' },
{ label: 'Training', value: 2, url: 'url2' },
{ label: 'Local', value: 3, url: 'url2' }
];
self.serverInfo.server = self.serverInfo.servers[1];
console.log(self.server);
self.serverInfo.url = self.serverInfo.server.url;
})
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I accept the answer from @pankajparkar, but I would like to show my latest code as it actually is with the proper binding suggested by @pankajparkar. I don't need $ watch anymore.
Html
<div class="list">
<label class="item item-input item-select">
<div class="input-label">
Serveur
</div>
<select ng-model="serverSelection.server" ng-options="s as s.label for s in serverSelection.servers">
</select>
</label>
</div>
<p>URL: {{serverSelection.server.url}}</p>
Js
.controller('SettingsCtrl', function ($scope, $log, serverSelection) {
//List of servers to connect to
$scope.serverSelection= serverSelection;
})
.service("serverSelection", function() {
var self = this;
self.servers = [
{ label: 'Production', value: 1, url: 'url0' },
{ label: 'Training', value: 2, url: 'url1' },
{ label: 'Local', value: 3, url: 'url2' }
];
self.server = self.servers[1];
})
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