I'm pretty new to Angular, so I may be going about this all wrong...
I have a <select> similar to the following:
<select ng-model="mySelectedValue">
<option value="">--</option>
<option ng-repeat="myValue in someDynamicArrayOfValues" value="{{myValue}}" ng-selected="myFunctionForDeterminingWhetherValueIsSelected(myValue)">{{myValue}}</option>
</select>
This mostly works... The dropdown initially renders with the correct option selected, and if I change the selected option, then mySelectedValue will get the new selection. However, mySelectedValue does NOT get the initially-selected option. mySelectedValue is blank until I change the value in the dropdown.
I looked at ng-init, but that seems to get evaluated before someDynamicArrayOfValues is set...
Is there a way I can get mySelectedValue to receive the value in the initially-selected <option>?
UPDATE:
I forgot to mention that I had also tried using ng-options, but haven't had any luck getting that to work in conjunction with determining which option was selected.
I've tried this:
<div ng-show="someDynamicArrayOfValues">
<select ng-model="mySelectedValue" ng-options="arrayValue for arrayValue in someDynamicArrayOfValues" ng-selected="myFunctionForDeterminingWhetherValueIsSelected(arrayValue)">
<option value="">--</option>
</select>
</div>
and this:
<div ng-show="someDynamicArrayOfValues">
<select ng-model="mySelectedValue" ng-options="arrayValue for arrayValue in someDynamicArrayOfValues" ng-init="myFunctionForSettingSelectedValue()">
<option value="">--</option>
</select>
</div>
but neither of those work because the select is built (and ng-init and ng-selected both get evaluated) before someDynamicArrayOfValues has been set and, therefore, before the <select> is even visible. When using <option ng-repeat="...">, the <select> doesn't get built/initialized until after someDynamicArrayOfValues is set, which is why I had been going that direction.
Is there a way to get the ng-options technique to work while, at the same time, having the select dependent on someDynamicArrayOfValues (if ng-options is the better way to go)?
UPDATE 2:
Here's a Plunker (modified from ababashka's answer) that is a little closer to what I'm ultimately trying to achieve: http://plnkr.co/edit/Kj4xalhI28i5IU0hGBLL?p=preview. It's not quite there yet... I'd like it to have each of the 3 dropdowns set with the closest-matching dynamic value once someDynamicArrayOfValues is set.
I think that it will be good it you will use ng-options attribute of select tag. It's an angular directive which creates options according to Array of options. You can take a look at select documentation
If you use your code - your function myFunctionForDeterminingWhetherValueIsSelected works twice for every option at initialization and once for every option item when you select some another option.
Demo for select you could see at description of select directive.
At first, to see when value is changed - you need to use ng-change attribute of select tag, like this:
<select ng-model="mySelectedValue"
ng-options="myValue for myValue in someDynamicArrayOfValues"
ng-change="myFunctionForDeterminingWhetherValueIsSelected()">
<option value="">--</option>
</select>
Then, i don't know how does myFunctionForSettingSelectedValue look like, but there are 2 variants:
ng-init next way.Controller:
$scope.someInitFunc = function () {
return 'One';
};
HTML:
<select ng-model="mySelectedValue"
ng-options="myValue for myValue in someDynamicArrayOfValues"
ng-change="myFunctionForDeterminingWhetherValueIsSelected()"
ng-init="mySelectedValue = someInitFunc()">
<option value="">--</option>
</select>
mySelectedValue in this function - then you do this.Controller:
$scope.someInitFunc = function () {
$scope.mySelectedValue = 'One';
};
HTML:
<select ng-model="mySelectedValue"
ng-options="myValue for myValue in someDynamicArrayOfValues"
ng-change="myFunctionForDeterminingWhetherValueIsSelected()"
ng-init="someInitFunc()">
<option value="">--</option>
</select>
I have created an example which implements the first version of using ng-init. When new value is selected - it's printed to console.
Also, i moved options to the options.json file. So options are initialized just after ajax request was finished. Everything works great.
Hello again. I think you don't need to have any ng-init according to your requirements. You can just initiate values of your model when http request is finished. Also i don't understand why do you need ng-change function in this case.
Here is modified code you need from your plunk where values of ng-models are initiated after options are loaded.
JavaScript:
.controller('MainCtrl', function($scope, $http) {
$scope.someStaticArrayOfValues = ['One', 'Two', 'Three'];
$scope.mySelectedValues = {};
$http.get('options.json').then(
function (response) {
$scope.someDynamicArrayOfValues = response.data;
for (var i = 0; i < $scope.someStaticArrayOfValues.length; ++i) {
$scope.someDynamicArrayOfValues.some(function (value) {
if (value.substring(0, $scope.someStaticArrayOfValues[i].length) === $scope.someStaticArrayOfValues[i]) {
$scope.mySelectedValues[$scope.someStaticArrayOfValues[i]] = value;
return true;
}
});
}
},
function (response) {
console.log('ERROR!');
}
);
});
HTML:
<body ng-controller="MainCtrl">
<p>Hello {{name}}!</p>
<div ng-show="someDynamicArrayOfValues">
<ul>
<li ng-repeat="staticValue in someStaticArrayOfValues">
{{staticValue}} -
<select ng-model="mySelectedValues[staticValue]"
ng-options="myValue for myValue in someDynamicArrayOfValues">
<option value="">--</option>
</select>
<h2>{{mySelectedValues[staticValue]}}</h2>
</li>
</ul>
</div>
</body>