Dynamic NG-Controller Name - javascript

I want to dynamically specify a controller based on a config that we load. Something like this:
<div ng-controller="{{config.controllerNameString}}>
...
</div>
How do I do this in angular? I thought this would be very easy, but I can seem to find a way of doing this.

What you want to do is have another directive run before anything else is called, get the controller name from some model remove the new directive and add the ng-controller directive, then re-compile the element.
That looks like this:
global.directive('dynamicCtrl', ['$compile', '$parse',function($compile, $parse) {
return {
restrict: 'A',
terminal: true,
priority: 100000,
link: function(scope, elem) {
var name = $parse(elem.attr('dynamic-ctrl'))(scope);
elem.removeAttr('dynamic-ctrl');
elem.attr('ng-controller', name);
$compile(elem)(scope);
}
};
}]);
Then you could use it in your template, like so:
<div dynamic-ctrl="'blankCtrl'">{{tyler}}</div>
with a controller like this:
global.controller('blankCtrl',['$scope',function(tyler){
tyler.tyler = 'tyler';
tyler.tyler = 'chameleon';
}]);
There's probably a way of interpolating the value ($interpolate) of the dynamic-ctrl instead of parsing it ($parse), but I couldn't get it to work for some reason.

I'm using it in ng-repeat, so this is improved code for loops and sub objects:
Template:
<div class="col-xs6 col-sm-5 col-md-4 col-lg-3" ng-repeat="box in boxes">
<div ng-include src="'/assets/js/view/box_campaign.html'" ng-dynamic-controller="box.type"></div>
</div>
Directive:
mainApp.directive('ngDynamicController', ['$compile', '$parse',function($compile, $parse) {
return {
scope: {
name: '=ngDynamicController'
},
restrict: 'A',
terminal: true,
priority: 100000,
link: function(scope, elem, attrs) {
elem.attr('ng-controller', scope.name);
elem.removeAttr('ng-dynamic-controller');
$compile(elem)(scope);
}
};
}]);

Personally the 2 current solutions here didn't work for me, as the name of the controller would not be known when first compiling the element but later on during another digest cycle. Therefore I ended up using:
myapp.directive('dynamicController', ['$controller', function($controller) {
return {
restrict: 'A',
scope: true,
link: function(scope, elem, attrs) {
attrs.$observe('dynamicController', function(name) {
if (name) {
elem.data('$Controller', $controller(name, {
$scope: scope,
$element: elem,
$attrs: attrs
}));
}
});
}
};
}]);

Related

How do I pass any array from ng-repeat to AngularJs attribute directive?

I have a list of hierarchy of menu items where each item has a child list. For The menuItems property is from the controller scope(list of parents). I want to pass an array to be consumed by the directive on both levels of the following example.
Html Code
<div sortable="menuItems">
<div ng-repeat="item in menuItems">
...
<div sortable="item.Children">
<div ng-repeat="child in menuItems.Children">...</div>
</div>
</div>
</div>
Directive code
app.directive('sortable', function ($timeout) {
return {
restrict: 'A',
link: function($scope, $elem, attrs) {
// I need access by the array in here.
}
};
});
I have set the sortable attribute to the value of the name of the list which obviously is not working for me.
You can set up a scope watch (or collection watch), since the value of the attribute is the scope expression.
app.directive('sortable', function ($timeout) {
return {
restrict: 'A',
link: function($scope, $elem, attrs) {
$scope.$watchCollection(attrs.sortable, function (newCollection, oldCollection) {
// (do something with newCollection)
});
}
};
});
The problem was the isolate-scope for the directive was not set.
app.directive('sortable', function ($timeout) {
return {
restrict: 'A',
link: function ($scope, $elem, attrs) {...},
scope: { items: '=' }
}
<div id="sortable-basic" sortable items="menuItems">

Angular directive not applied on change of the value

I have a directive like
testApp.directive('changeValue', function(){
alert("coming");
return {
restrict: 'E',
link: function (scope, element, attrs) {
element.text(attrs.val);
},
replace: true
};
});
and I have my views as follows
<change-value val="{{test.val}}"/>
When I refresh my page, I could see the values and I get the alerts. But when the value is changed I don't get it applied to the directive but it binds to the view as I could see it being changed outside when simply called like
<span>{{test.val}}</span>
I am not sure how this works. Thanks in Advance!
In your code, the link function is executed only once so the value is updated only when the directive instance is created. Since you want to have a watch of its value and keep updating the text you can use $observe()
var app = angular.module('my-app', [], function() {})
app.controller('AppController', function($scope) {
$scope.test = {
val: "Welcome"
};
});
app.directive('changeValue', function() {
return {
restrict: 'E',
link: function(scope, element, attrs) {
attrs.$observe('val', function() {
element.text(attrs.val);
})
},
replace: true
};
});
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="my-app" ng-controller="AppController">
<change-value val="{{test.val}}"></change-value>
<input ng-model="test.val" />
</div>

How to watch a model from a directive in the context of its source scope AngularJS

I need to watch a model from within a directive.
angular.module('app', [])
.directive('myDirective', [function() {
return {
restrict: 'A',
scope: {
modelToWatch: '#'
},
link: function(scope, element, attrs) {
scope.$watch(scope.modelToWatch, function(val) {
// do something...
});
}
};
]})
.controller('MyController', ['$scope', function($scope) {
$scope.obj = {
foo: 'val'
};
}]);
<div ng-controller="MyController">
<div my-directive model-to-watch="obj.foo"></div>
</div>
The above works fine.
However, I encounter a problem when there is an intermediary scope between the actual owner of the model and the directive.
I used another controller to demonstrate the scenario below:
.controller('AnotherController', ['$scope', function($scope) {}])
<div ng-controller="MyController">
<div ng-controller="AnotherController">
<div my-directive model-to-watch="obj.foo"></div>
</div>
</div>
In the case for above, I could look up the $parent tree to find the scope which owns the property I want to watch using the code below:
...
link: function(scope, element, attrs) {
var contextScope = scope;
// find for the scope which owns the property that we want to watch
while (contextScope != null && contextScope.hasOwnProperty(attrs.modelToWatch)) {
contextScope = contextScope.$parent;
}
// use the scope found to watch the model
if (contextScope != null) {
contextScope.$watch(scope.modelToWatch, function(val) {
// do something...
});
}
}
Additional problem, however is if the modelToWatch is a complex expression (e.g: "tableParams.filter().shop_id" then the hasOwnProperty cannot be relied upon.
Is there an easy way to watch a model in the context of its owner scope? Or is it's possible to watch a model even from a prototypal child?
Or can I pass scope as a parameter, so at least I don't have to look for it...
restrict: 'A',
scope: {
modelToWatch: '#',
sourceScope: '=', // don't know how to do this..
}
Note: I need to use isolate scope
As suggested by #pixelbit, I tried using the $eval to find the correct scope
link: function(scope, element, attrs) {
var contextScope = scope;
// find for the scope which owns the property that we want to watch
while (contextScope != null && contextScope.$eval(attrs.modelToWatch) != undefined) {
contextScope = contextScope.$parent;
}
...
}
Works for most cases except when the modelToWatch expression actually evaluates to undefined.. There is an ambiguity whether the modelToWatch doesn't exist in the current scope (meaning it's not the owner) or the modelToWatch expression just happens to evaluate to undefined.
You can declare a controller directly inside your directive :
angular.module('app', [])
.directive('myDirective', [function() {
return {
restrict: 'A',
scope: {
modelToWatch: '='
},
link: function(scope, element, attrs) {
scope.$watch(scope.modelToWatch, function(val) {
// do something...
});
},
controller: 'MyController'
};
]})
.controller('MyController', ['$scope', function($scope) {
$scope.obj = {
foo: 'val'
};
}]);
<div my-directive model-to-watch="obj.foo"></div>
That way, when you will call your directive, your controller will be instanciated first, then the link will be executed, sharing the same scope.
You can watch a function instead:
scope.$watch(function() {
return scope.modelToWatch;
}, function(val) {
// do something
});
There is no need for an isolated scope - you can inherit scope instead. Also to address complex expressions, you can use scope.$eval to evaluate the model and find the appropriate scope. Once you've evaluated the model, return it from a watched function:
angular.module('app', [])
.directive('myDirective', [function() {
return {
restrict: 'A',
scope: false,
link: function(scope, element, attrs) {
scope.$watch(function() {
return scope.$eval(attrs.modelToWatch);
}, function(val) {
// do something...
});
}
};
]})
If you must to use an isolated scope, then watch a function and return the model:
angular.module('app', [])
.directive('myDirective', [function() {
return {
restrict: 'A',
scope: {
modelToWatch: '='
},
link: function(scope, element, attrs) {
scope.$watch(function() {
return scope.modelToWatch;
}, function(val) {
// do something...
});
}
};
]})

AngularJS: Objects inside nested directives getting undefined?

So, I have two directives, one that has a template file, which contains another directive of the same type.
The first directive looks like:
.directive('billInfo', function () {
return {
// scope: true,
scope: {
obj: '='
},
restrict: 'E',
templateUrl: 'views/templates/bill-info.html',
link: function (scope, element, attrs) {
scope.status = scope.obj.getStatus();
scope.bill = scope.obj;
}
}
})
And the template is pretty simple, something like;
<h4>
<span class="glyphicon glyphicon-cutlery">
{{bill.getTable()}}
</span>
<small><span class="time"></span></small>
<div class="btn-group bill-btn">
<bill-btns billobj="bill"></bill-btns>
</div>
</h4>
The directive for billBtns looks like:
.directive('billBtns', function () {
return {
scope: {
billobj: '='
},
restrict: 'E',
template: '<div><div>koko{{status}}</div></div>',
link: function (scope, element, attrs) {
console.log(scope, scope.billobj);
scope.status = scope.billobj.getStatus();
}
}
})
The problem is unexpected: scope.billobj turns out to be undefined. When I console log scope from within the link function of the billBtns directive, all seems ok: I can see billobj inside scope.
What is going on here? Am I doing something fundamentally wrong here?
EDIT: Template for billInfo
<div draggable ng-repeat="(index, bill) in getEnq()" bill="bill" id="bill-{{bill.orderCode}}" class="container panel panel-default bill float-{{index%2}}" style="width:300px;" data-created="{{bill.getCreatedOn()}}">
<bill-info obj="bill"></bill-info>
</div>
I believe I've come to a solution, but I'm uncertain as to if this is the right practice. Here's what the new billBtns directive looks like:
.directive('billBtns', function () {
return {
restrict: 'E',
template: '<div><div>koko{{status}}</div></div>',
link: function (scope, element, attrs) {
console.log(scope, scope.$parent.obj);
scope.status = scope.$parent.bill.getStatus();
}
}
})
And that solves the problem. My suspicion is this, if we look at the billInfo directive again, I do something like:
scope.bill = scope.obj; // woah?
I'd like to understand more about why this happens and why I can access scope.$parent.bill from a nested directive but not scope.$parent.obj without getting typeerrors. Or maybe thats just the way to cascade scopes.

Any way to dynamically load angular directives?

Here's a short fiddle:
http://jsfiddle.net/aSg9D/
Basically, neither <div data-foo-{{letterA}}></div> nor <div data-ng:model="foo-{{letterB}}"></div> are interpolated.
I'm looking for a way to dynamically load one of several inline templates.
Pardon me if this has already been asked before, but I searched and couldn't find it.
I believe Radim Köhler has the correct answer. Just before it was posted, I hacked together something to load directives from another directive like this:
angular.module('myApp', []).directive('loadTmpl', function($compile) {
return {
restrict: 'A',
replace: true,
link: function($scope, $element, $attr) {
$element.html("<div data-card-"+$attr.loadTmpl+"></div>");
$compile($element.contents())($scope);
}
};
});
And:
<div data-load-tmpl="{{directiveName}}"></div>
I think that's the minimalist approach, but there's probably something wrong with it, so just look at the answer below.
Let's adjust it this way (the udpated fiddle). The view:
<div my-selector name="letterA"></div>
<div my-selector name="letterB"></div>
the controller:
function myCtrl($scope) {
$scope.letterA = 'bar';
$scope.letterB = 'baz';
}
And here is new directive mySelector, containing the selector
.directive('mySelector',
[ '$templateCache','$compile',
function($templateCache , $compile) {
return {
scope: {
name: '='
},
replace: true,
template: '',
link: function (scope, elm, attrs) {
scope.buildView = function (name) {
var tmpl = $templateCache.get("dir-foo-" + name);
var view = $compile(tmpl)(scope);
elm.append(view);
}
},
controller: ['$scope', function (scope) {
scope.$watch('name', function (name) {
scope.buildView(name);
});
}],
};
}])
.run(['$templateCache', function ($templateCache) {
$templateCache.put("dir-foo-bar", '<div data-foo-bar></div>');
$templateCache.put("dir-foo-baz", '<div data-foo-baz></div>');
}])
In case you like it, all credits goes to Render a directive inside another directive (within repeater template) and AngularJS - Directive template dynamic, if you don't, blame me.

Categories