Say you have a form that has values loaded from database. How do you initialize ng-model?
Example:
<input name="card[description]" ng-model="card.description" value="Visa-4242">
In my controller, $scope.card is undefined initially. Is there a way besides doing something like this?
$scope.card = {
description: $('myinput').val()
}
This question is related to
angularjs
If you can't rework your app to do what @blesh suggests (pull JSON data down with $http or $resource and populate $scope), you can use ng-init instead:
<input name="card[description]" ng-model="card.description" ng-init="card.description='Visa-4242'">
See also AngularJS - Value attribute on an input text box is ignored when there is a ng-model used?
IMHO the best solution is the @Kevin Stone directive, but I had to upgrade it to work in every conditions (f.e. select, textarea), and this one is working for sure:
angular.module('app').directive('ngInitial', function($parse) {
return {
restrict: "A",
compile: function($element, $attrs) {
var initialValue = $attrs.value || $element.val();
return {
pre: function($scope, $element, $attrs) {
$parse($attrs.ngModel).assign($scope, initialValue);
}
}
}
}
});
If you like Kevin Stone's approach above https://stackoverflow.com/a/17823590/584761 consider an easier approach by writing directives for specific tags such as 'input'.
app.directive('input', function ($parse) {
return {
restrict: 'E',
require: '?ngModel',
link: function (scope, element, attrs) {
if (attrs.ngModel) {
val = attrs.value || element.text();
$parse(attrs.ngModel).assign(scope, val);
}
}
}; });
If you go this route you won't have to worry about adding ng-initial to every tag. It automatically sets the value of the model to the tag's value attribute. If you do not set the value attribute it will default to an empty string.
Here is a server-centric approach:
<html ng-app="project">
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<script>
// Create your module
var dependencies = [];
var app = angular.module('project', dependencies);
// Create a 'defaults' service
app.value("defaults", /* your server-side JSON here */);
// Create a controller that uses the service
app.controller('PageController', function(defaults, $scope) {
// Populate your model with the service
$scope.card = defaults;
});
</script>
<body>
<div ng-controller="PageController">
<!-- Bind with the standard ng-model approach -->
<input type="text" ng-model="card.description">
</div>
</body>
</html>
It's the same basic idea as the more popular answers on this question, except $provide.value registers a service that contains your default values.
So, on the server, you could have something like:
{
description: "Visa-4242"
}
And put it into your page via the server-side tech of your choice. Here's a Gist: https://gist.github.com/exclsr/c8c391d16319b2d31a43
I tried what @Mark Rajcok suggested. Its working for String values (Visa-4242). Please refer this fiddle.
From the fiddle:
The same thing that is done in the fiddle can be done using ng-repeat, which everybody could recommend. But after reading the answer given by @Mark Rajcok, i just wanted to try the same for a form with array of profiles.
Things work well untill i have the $scope.profiles = [{},{}]; code in the controller. If i remove this code, im getting errors.
But in normal scenarios i cant print $scope.profiles = [{},{}]; as i print or echo html from the server.
Will it be possible to execute the above, in a similar fashion as @Mark Rajcok did for the string values like <input name="card[description]" ng-model="card.description" ng-init="card.description='Visa-4242'">, without having to echo the JavaScript part from the server.
I have a simple approach, because i have some heavy validations and masks in my forms. So, i used jquery to get my value again and fire the event "change" to validations:
$('#myidelement').val('123');
$('#myidelement').trigger( "change");
You can also use within your HTML code:
ng-init="card.description = 12345"
It is not recommended by Angular, and as mentioned above you should use exclusively your controller.
But it works :)
Just added support for select element to Ryan Montgomery "fix"
<select class="input-control" ng-model="regCompModel.numberOfEmployeeId" ng-initial>
<option value="1af38656-a752-4a98-a827-004a0767a52d"> More than 500</option>
<option value="233a2783-db42-4fdb-b191-0f97d2d9fd43"> Between 250 and 500</option>
<option value="2bab0669-550c-4555-ae9f-1fdafdb872e5"> Between 100 and 250</option>
<option value="d471e43b-196c-46e0-9b32-21e24e5469b4"> Between 50 and 100</option>
<option value="ccdad63f-69be-449f-8b2c-25f844dd19c1"> Between 20 and 50</option>
<option value="e00637a2-e3e8-4883-9e11-94e58af6e4b7" selected> Less then 20</option>
</select>
app.directive('ngInitial', function () {
return {
restrict: 'A',
controller: ['$scope', '$element', '$attrs', '$parse', function ($scope, $element, $attrs, $parse) {
val = $attrs.sbInitial || $attrs.value || $element.val() || $element.text()
getter = $parse($attrs.ngModel)
setter = getter.assign
setter($scope, val)
}]
}
});
If you have the init value in the URL like mypage/id, then in the controller of the angular JS you can use location.pathname to find the id and assign it to the model you want.
This is an obviously lacking, but easily added fix for AngularJS. Just write a quick directive to set the model value from the input field.
<input name="card[description]" value="Visa-4242" ng-model="card.description" ng-initial>
Here's my version:
var app = angular.module('forms', []);
app.directive('ngInitial', function() {
return {
restrict: 'A',
controller: [
'$scope', '$element', '$attrs', '$parse', function($scope, $element, $attrs, $parse) {
var getter, setter, val;
val = $attrs.ngInitial || $attrs.value;
getter = $parse($attrs.ngModel);
setter = getter.assign;
setter($scope, val);
}
]
};
});
This one is a more generic version of the ideas mentioned above... It simply checks whether there is any value in the model, and if not, it sets the value to the model.
JS:
function defaultValueDirective() {
return {
restrict: 'A',
controller: [
'$scope', '$attrs', '$parse',
function ($scope, $attrs, $parse) {
var getter = $parse($attrs.ngModel);
var setter = getter.assign;
var value = getter();
if (value === undefined || value === null) {
var defaultValueGetter = $parse($attrs.defaultValue);
setter($scope, defaultValueGetter());
}
}
]
}
}
HTML (usage example):
<select class="form-control"
ng-options="v for (i, v) in compressionMethods"
ng-model="action.parameters.Method"
default-value="'LZMA2'"></select>
You can use a custom directive (with support to textarea, select, radio and checkbox), check out this blog post https://glaucocustodio.github.io/2014/10/20/init-ng-model-from-form-fields-attributes/.
As others pointed out, it is not good practice to initialize data on views. Initializing data on Controllers, however, is recommended. (see http://docs.angularjs.org/guide/controller)
So you can write
<input name="card[description]" ng-model="card.description">
and
$scope.card = { description: 'Visa-4242' };
$http.get('/getCardInfo.php', function(data) {
$scope.card = data;
});
This way the views do not contain data, and the controller initializes the value while the real values are being loaded.
Source: Stackoverflow.com