I have a set of directives that create a nested list with arbitrary depth. I am looking to use ng-click to send a selected <li>'s object back to the controller. The current attempt looks as so:
angular.module('crmProductgallery').directive('categorytree', function() {
return {
template: '<ul><categorytree-node ng-repeat="item in items" getCategories="getCategories"></categorytree-node></ul>',
restrict: 'E',
replace: true,
// controller: 'CrmProductgallerygallery',
scope: {
items: '=items',
getCategories: '&',
}
};
});
angular.module('crmProductgallery').directive('categorytreeNode', function($compile) {
return {
restrict: 'E',
template: '<li ng-click="getCategories()" getCategories="getCategories">{{item.title}}</li>',
// replace: true,
// controller: 'CrmProductgallerygallery',
// scope: {
// getCategories: '&',
// items: "="
// },
link: function(scope, elm, attrs) {
scope.$watch('items', function() {
$(elm).on('click', function(e) {
scope.getCategories(scope.item);
console.log(scope.item);
// https://stackoverflow.com/questions/15390393/two-nested-click-events-with-angularjs
e.stopPropagation();
});
if (scope.item.children) {
var children = $compile('<categorytree items="item.children" getCategories="getCategories"></categorytree>')(scope);
elm.append(children);
}
});
}
};
});
The code produces the following unordered list:
Currently, when I click on a <li>, scope.item is logged inside my scope.$watch() function, but the controller function getCategories(item) is not called.
If I uncomment out the scope declaration...
...in the categorytreeNode directive, I will get Cannot read properties of undefined (reading 'children). The list does not get created. scope.item no longer exists when trying that.
If I uncomment controller: 'CrmProductgallerygallery', the ng-click works and my controller function is called, but the list elements get duplicated over and over again. Here is what I mean:
Controller Function works on click now:
But now my list is duplicating:
You will also notice I placed getCategories="getCategories" everywhere I could think of trying. None of it works though. I think it is because the <ul> element is getting assigned ng-isolate-scope:
The controller function simply is this:
$scope.getCategories = function(item) {
console.log("getCategories");
console.log(item);
};
Question:
How can I get ng-click on the <li> elements to call my getCategories() controller function
Related
I have a directive treeview which contains a nested directive (being the branches) of each item rendered.
In the scope of both directives I have declared two parameters that should be talking to the parent controller.
filter: '&' //binds the method filter within the nested directive (branch) to the method doSomething() in the tree directive attribute which is bound to the html directive that binds to the controller.
iobj: '=' is the two way binding paramter that should be passing the scoped object to the controller. (but currently isn't)
Directive:
app.directive('tree', function () {
return {
restrict: 'E',
replace: true,
scope: {
t: '=src',
filter: '&',
iobj: '='
},
controller: 'treeController',
template: '<ul><branch ng-repeat="c in t.children" iobj="object" src="c" filter="doSomething()"></branch></ul>'
};
});
app.directive('branch', function($compile) {
return {
restrict: 'E',
replace: true,
scope: {
b: '=src',
filter: '&',
iobj: '='
},
template: '<li><input type="checkbox" ng-click="innerCall()" ng-hide="visible" /><a>{{ b.name }}</a></li>',
link: function (scope, element, attrs) {
var has_children = angular.isArray(scope.b.children);
scope.visible = has_children;
if (has_children) {
element.append('<tree src="b"></tree>');
$compile(element.contents())(scope);
}
element.on('click', function(event) {
event.stopPropagation();
if (has_children) {
element.toggleClass('collapsed');
}
});
scope.innerCall = function () {
scope.iobj = scope.b;
console.log(scope.iobj);
scope.filter();
}
}
};
});
HTML:
<div ng-controller="treeController">
<tree src="myList" iobj="object" filter="doSomething()"></tree>
<a ng-click="clicked()"> link</a>
</div>
Controller:
app.controller("treeController", ['$scope', function($scope) {
var vm = this;
$scope.object = {};
$scope.doSomething = function () {
var item = $scope.object;
//alert('call from directive');
console.log(item);
}
$scope.clicked = function () {
alert('clicked');
}
...
Currently I can invoke the function $scope.doSomething from the directive to the controller. So I know that I have access to the controllers scope from the directive. What I cannot figure out is how to pass an object as a parameter from the directive back to the controller. When I run this code, $scope.object
is always an empty object.
I'd appreciate any help or suggestions on how to go about this.
The & directive binding supports parameter passing. Given your example
scope.filter({message: 'Hello', anotherMessage: 'Good'})
The message and anotherMessage become local variables in the expression bound to directive:
<tree src="myList" iobj="object" filter="doSomething(anotherMessage, message)"></tree>
Here's a sample plunker where the callback parameters are set inside a template.
The documentation clearly states that:
Often it's desirable to pass data from the isolated scope via an
expression to the parent scope, this can be done by passing a map of
local variable names and values into the expression wrapper fn. For
example, if the expression is increment(amount) then we can specify
the amount value by calling the localFn as localFn({amount: 22}).
I am working on an angular project and I use a directive to create an isolated scope. The directive looks like this:
var directive = module.directive('question', function () {
return {
restrict: 'E',
templateUrl: 'question.html',
transclude: true,
scope: {
quiz: '=quiz'
},
link: function (scope, attr, element) {
scope.$watch(function () {
return scope.quiz;
},
function (oldVal, newVal) {
scope.currentQuestion = scope.quiz;
});
}
};
});
For I do not want to bind to a property (or field) in my Controller, I created a function and call the directive this way:
<question quiz="quiz.getCurrentQuestion()">... (transcluding stuff)</question>
Please note that quiz is my Controller using the as-Syntax.
The way I process the directive is working, but I don't like to create a two-way-binding ( to an R-value?).
Now I tried to just pass the function using &-binding but this just turns out odd results in the link-function and breaks everything.
Can I use the function-binding using & and somehow call the function (in my template or in the link-function) to get the result I need to make it work like two-way-binding?
Thank you for your help.
EDIT
The return value of the getCurrentQuestion-function is an object which looks like
{
questionNumber: 1,
answers: [],
getQuestionText() : function(...),
...
}
So nothing to special, I hope...
EDIT 2
When I use
...
scope: {
quiz: '&quiz'
}
then in the $watch-function I get
function(locals) { return parentGet(scope, locals); } for scope.quiz
And if I call the function like scope.quiz() I get undefined as result.
Couldn't find any way to watch a function in scope binding. However, there are other solutions. If you want single way binding you can use '#', but that means that you would have to parse the JSON in the watch ( working example):
var directive = module.directive('question', function () {
return {
restrict: 'E',
templateUrl: 'question.html',
transclude: true,
scope: {
quiz: '#'
},
link: function (scope, attr, element) {
scope.$watch('quiz', function (newVal, oldVal) {
scope.currentQuestion = angular.fromJson(newVal);
});
}
};
});
It works, but if you have a high rate of updates, the overhead can be annoying. What I would do, is use a service that holds all the questions, and both controller and directive can talk to. When the current question is changed, the controller should pass to the directive only the id of the new question (using simple # bind), and the directive would query the service for the question.
Here's the explanation:
I have the current controller that creates an array of $scope.plan.steps which will be used to store every step:
.controller('PlanCtrl', function ($scope, $http) {
$scope.plan = {
steps: [{}]
};
$scope.addStep = function () {
$scope.tutorial.steps.push({});
}
}
Then I have the following directive which has an isolated scope and that is associated to the index of the $scope.plan.steps array:
.directive('planStep', function () {
return {
template: '<input type="text" ng-model="step.name" />{{step}}',
restrict: 'E',
scope: {
index: '=index'
},
transclude: true,
controller: function($scope, $element, $transclude) {
$scope.removeStep = function() {
$scope.$emit('removeStep', $scope.index);
$element.remove();
$scope.$destroy();
}
}
};
});
These two communicate, create, and delete objects inside of the controller's scope, however, how can I allow the directive to update the controller's scope array in real time?
I've tried doing a $watch on the directive's isolated scope changes, $emit the changes to the controller, and specify the $index... But no luck.
I've created a plunker to reproduce what I currently have: Link
So far I can create and delete objects inside of the array, but I cannot get a single object to update the controller's object based on the $index.
If the explanation was not clear, by all means, let me know and I will elaborate.
Thank you
WHen you do things like this inside ng-repeat you can take advantage of the child scope that ng-repeat creates and work without isolated scope.
Here's the same directive without needing any angular events
.directive('planStep', function() {
return {
template: '<button ng-click="removeStep(step)">Delete step</button><br><input type="text" ng-model="step.name" />{{step}}<br><br>',
restrict: 'E',
transclude: true,
controller: function($scope, $element, $transclude) {
var steps = $scope.plan.steps// in scope from main controller
/* can do the splicing here if we want*/
$scope.removeStep = function(step) {
var idx =steps.indexOf(step)
steps.splice(idx, 1);
}
}
};
});
Also note that removing the element with element.remove() is redundant since it will automatically be removed by angular when array gets spliced
As for the update, it will update the item in real time
DEMO
The way you set up 2-way binding for index you could set one up for step as well? And you really do not need index to remove the item, eventhough your directive is isolated it relies on the index from ng-repeat which probably is not a good idea.
<plan-step ng-repeat="step in plan.steps" index="$index" step="step"></plan-step>
and in your directive:
scope: {
index: '=index',
step:'='
},
Demo
Removing $index dependency and redundant element remove() and scope destroy (when the item is removed from the array angular will manage it by itself):
return {
template: '<button ng-click="removeStep()">Delete step</button><br><input type="text" ng-model="step.name" />{{step}}<br><br>',
restrict: 'E',
scope: {
step:'='
},
transclude: true,
controller: function($scope, $element, $transclude) {
$scope.removeStep = function() {
$scope.$emit('removeStep', $scope.step);
}
}
and in your controller:
$scope.$on('removeStep', function(event, data) {
var steps = $scope.plan.steps;
steps.splice(steps.indexOf(data), 1);
});
Demo
If you want to get rid of $emit you could even expose an api with the isolated scoped directive with function binding (&).
return {
template: '<button ng-click="onDelete({step:step})">Delete step</button><br><input type="text" ng-model="step.name" />{{step}}<br><br>',
restrict: 'E',
scope: {
step:'=',
onDelete:'&' //Set up function binding
},
transclude: true
};
and register it on the view:
<plan-step ng-repeat="step in plan.steps" step="step" on-delete="removeStep(step)"></plan-step>
Demo
I'm quite new to AngularJS and I'm trying to understand a few things.
First of all, I have my controller of which I will place a snippet here:
var OfficeUIRibbon = angular.module('OfficeUIRibbon');
// Defines the OfficeUIRibbon controller for the application.
OfficeUIRibbon.controller('OfficeUIRibbon', ['$scope', '$http', function($scope, $http) {
var ribbon = this;
ribbon.setApplicationMenuAsActive = function() {
ribbon.applicationMenuActive = true;
}
}
Then I have a directive:
var OfficeUIRibbon = angular.module('OfficeUIRibbon');
OfficeUIRibbon.directive('ribbonApplicationMenu', function() {
return {
restrict: 'E',
replace: false,
scope: {
data: '#'
},
templateUrl: function(element, attributes) {
return attributes.templateurl;
}
}
});
The directive is called like this:
<ribbon-application-menu templateUrl="/OfficeUI.Beta/Resources/Templates/ApplicationMenu.html" data="/OfficeUI.Beta/Resources/JSon/Ribbon/ribbon.json"></ribbon-application-menu>
This does all work and in my template for the directive, the following is placed:
<div id="application" id="applicationMenuHolder" ng-controller="OfficeUIRibbon as OfficeUIRibbon" ng-show="OfficeUIRibbon.applicationMenuActive"...
From inside another element, when I execute a click a function on my controller is executed:
ng-click="OfficeUIRibbon.setApplicationMenuAsActive()"
Here's the directive from the other element:
OfficeUIRibbon.directive('ribbon', function() {
return {
restrict: 'E',
replace: false,
scope: {
data: '#'
},
templateUrl: function(element, attributes) {
return attributes.templateurl;
}
}
});
This function does change the property "applicationMenuActive" on the ribbon itself, which should make the item in the directive template show up.
However, this is not working. I'm guessing I need to watch this property so the view get's updated accordingly.
Anyone has an idea on how this could be done?
Let's say I have an app called myApp. There is a directive for a menu component. This directive has a controller defined on it. Now, from another controller that loads the view, I want to call methods of that menu directive's controller.
What does the code look like to do that? How can the other controller call methods on the menu directive's controller?
I think the issue is that you're trying to go controller -> directive when you should be binding a function to some delegating call that goes controller <- directive.
For an example of this, you can check out angular-ui/bootstrap's tabs directive onSelect and onDeselect:
.directive('tab', ['$parse', function($parse) {
return {
require: '^tabset',
restrict: 'EA',
replace: true,
templateUrl: 'template/tabs/tab.html',
transclude: true,
scope: {
active: '=?',
heading: '#',
onSelect: '&select', //This callback is called in contentHeadingTransclude
//once it inserts the tab's content into the dom
onDeselect: '&deselect'
},
// etc.
Using the & expression allows you to bind to a function as a callback.
An example of this usage would be a scope-bound function in your target controller:
$scope.selectedTab = function(){ alert('woohoo'); };
Which is 'bound' to the directive's function in the view:
<tab select="selectedTab()">
The tabs directive also has a good example of how to communicate between two different directives controllers. See tabset controller's ctrl.select. A tab directive requires a parent tabSet controller with the require:
.directive('tab', ['$parse', function($parse) {
return {
require: '^tabset',
The tab directive can access the tabset controller's select function in the compile function:
compile: function(elm, attrs, transclude) {
return function postLink(scope, elm, attrs, tabsetCtrl) {
scope.$watch('active', function(active) {
if (active) {
tabsetCtrl.select(scope);
}
});
scope.disabled = false;
if ( attrs.disabled ) {
scope.$parent.$watch($parse(attrs.disabled), function(value) {
scope.disabled = !! value;
});
}
scope.select = function() {
if ( !scope.disabled ) {
scope.active = true;
}
};
tabsetCtrl.addTab(scope);
scope.$on('$destroy', function() {
tabsetCtrl.removeTab(scope);
});
//We need to transclude later, once the content container is ready.
//when this link happens, we're inside a tab heading.
scope.$transcludeFn = transclude;
};
}
So there you have how to execute code from some non-directive controller as a result of some action happening in your directive and how to execute some inter-directive functions as a result of directive require constraints.
edit: For anyone interested, here's the documentation for a directive's expressions: http://docs.angularjs.org/api/ng/service/$compile#comprehensive-directive-api