Angularjs - Pass argument to directive - angularjs

Im wondering if there is a way to pass an argument to a directive?
What I want to do is append a directive from the controller like this:
$scope.title = "title";
$scope.title2 = "title2";
angular.element(document.getElementById('wrapper')).append('<directive_name></directive_name>');
Is it possible to pass an argument at the same time so the content of my directive template could be linked to one scope or another?
here is the directive:
app.directive("directive_name", function(){
return {
restrict:'E',
transclude:true,
template:'<div class="title"><h2>{{title}}</h3></div>',
replace:true
};
})
What if I want to use the same directive but with $scope.title2?

You can pass arguments to your custom directive as you do with the builtin Angular-directives - by specifying an attribute on the directive-element:
angular.element(document.getElementById('wrapper'))
.append('<directive-name title="title2"></directive-name>');
What you need to do is define the scope (including the argument(s)/parameter(s)) in the factory function of your directive. In below example the directive takes a title-parameter. You can then use it, for example in the template, using the regular Angular-way: {{title}}
app.directive('directiveName', function(){
return {
restrict:'E',
scope: {
title: '#'
},
template:'<div class="title"><h2>{{title}}</h2></div>'
};
});
Depending on how/what you want to bind, you have different options:
= is two-way binding
# simply reads the value (one-way binding)
& is used to bind functions
In some cases you may want use an "external" name which differs from the "internal" name. With external I mean the attribute name on the directive-element and with internal I mean the name of the variable which is used within the directive's scope.
For example if we look at above directive, you might not want to specify another, additional attribute for the title, even though you internally want to work with a title-property. Instead you want to use your directive as follows:
<directive-name="title2"></directive-name>
This can be achieved by specifying a name behind the above mentioned option in the scope definition:
scope: {
title: '#directiveName'
}
Please also note following things:
The HTML5-specification says that custom attributes (this is basically what is all over the place in Angular applications) should be prefixed with data-. Angular supports this by stripping the data--prefix from any attributes. So in above example you could specify the attribute on the element (data-title="title2") and internally everything would be the same.
Attributes on elements are always in the form of <div data-my-attribute="..." /> while in code (e.g. properties on scope object) they are in the form of myAttribute. I lost lots of time before I realized this.
For another approach to exchanging/sharing data between different Angular components (controllers, directives), you might want to have a look at services or directive controllers.
You can find more information on the Angular homepage (directives)

Here is how I solved my problem:
Directive
app.directive("directive_name", function(){
return {
restrict: 'E',
transclude: true,
template: function(elem, attr){
return '<div><h2>{{'+attr.scope+'}}</h2></div>';
},
replace: true
};
})
Controller
$scope.building = function(data){
var chart = angular.element(document.createElement('directive_name'));
chart.attr('scope', data);
$compile(chart)($scope);
angular.element(document.getElementById('wrapper')).append(chart);
}
I now can use different scopes through the same directive and append them dynamically.

You can try like below:
app.directive("directive_name", function(){
return {
restrict:'E',
transclude:true,
template:'<div class="title"><h2>{{title}}</h3></div>',
scope:{
accept:"="
},
replace:true
};
})
it sets up a two-way binding between the value of the 'accept' attribute and the parent scope.
And also you can set two way data binding with property: '='
For example, if you want both key and value bound to the local scope you would do:
scope:{
key:'=',
value:'='
},
For more info,
https://docs.angularjs.org/guide/directive
So, if you want to pass an argument from controller to directive, then refer this below fiddle
http://jsfiddle.net/jaimem/y85Ft/7/
Hope it helps..

Controller code
myApp.controller('mainController', ['$scope', '$log', function($scope, $log) {
$scope.person = {
name:"sangeetha PH",
address:"first Block"
}
}]);
Directive Code
myApp.directive('searchResult',function(){
return{
restrict:'AECM',
templateUrl:'directives/search.html',
replace: true,
scope:{
personName:"#",
personAddress:"#"
}
}
});
USAGE
File :directives/search.html
content:
<h1>{{personName}} </h1>
<h2>{{personAddress}}</h2>
the File where we use directive
<search-result person-name="{{person.name}}" person-address="{{person.address}}"></search-result>

<button my-directive="push">Push to Go</button>
app.directive("myDirective", function() {
return {
restrict : "A",
link: function(scope, elm, attrs) {
elm.bind('click', function(event) {
alert("You pressed button: " + event.target.getAttribute('my-directive'));
});
}
};
});
here is what I did
I'm using directive as html attribute and I passed parameter as following in my HTML file. my-directive="push" And from the directive I retrieved it from the Mouse-click event object. event.target.getAttribute('my-directive').

Insert the var msg in the click event with scope.$apply to make the changes to the confirm, based on your controller changes to the variables shown in ng-confirm-click therein.
<button type="button" class="btn" ng-confirm-click="You are about to send {{quantity}} of {{thing}} selected? Confirm with OK" confirmed-click="youraction(id)" aria-describedby="passwordHelpBlock">Send</button>
app.directive('ngConfirmClick', [
function() {
return {
link: function(scope, element, attr) {
var clickAction = attr.confirmedClick;
element.on('click', function(event) {
var msg = attr.ngConfirmClick || "Are you sure? Click OK to confirm.";
if (window.confirm(msg)) {
scope.$apply(clickAction)
}
});
}
};
}
])

Related

pass data from controller to directive's link?

In my controller :
myApp.controller('homeCtrl', function($scope, $rootScope, $state, 'red';
$rootScope.$on('new_story', function(event, data) {
$scope.cardObj = {key:'value'};
});
});
In my HTML :
<div clickmeee ></div>
<div id="feedContainer" card='{{cardObj}}'> </div>
In my directive :
myApp.directive('clickmeee', function($compile, $rootScope) {
return {
restrict: 'A',
scope: {
card: '#'
},
link: function(scope, element, attrs) {
element.bind('click', function() {   
scope.$watch('card', function(newVal, oldVal) {
alert(scope.card);
});       
});
}
};
});
How do I pass data from controller to this directive. I compile some html and prepend it to the div. All of that is sorted out but I need some data from object I am trying to pass.
Any help??
There are several problems in your code:
you define a scope attribute named 'card', but you use cardObj instead
you use a watch that is completely unnecessary. And worse: you create a new watch every time the element is clicked
you don't define any card attribute on your clickmeee element. Instead, you're placing it on another element, on which the directive is not applied
you're passing the attribute with '#'. That works, but the directive will receive a string, containing the JSONified object, rather than the object itself
you're not showming us where you emit an event that will initialize cardObj in the controller scope
Here is a plunkr showing a working version of your code.
Also, note that using bind('click') is a bad idea. You'd better have a template in your directive and use ng-click in the template, or simply not use a directive at all and just use ng-click directly on the div element.
Bad news. You are doing it wrong all the ways.
Firstly
card='{{cardObj}}' >
this one should be put in the
<div clickmeee ></div>
So you can take it as binded scope variable in your directive registration
Secondly
If you managed to use '#' syntax
card: '#'
it will turn your input to string, not a binded scope. Use '=' instead.
In the end
You dont need to use watch here:
scope.$watch('card', function(newVal, oldVal) {
alert(newVal);
});
since scope.card is binded via '=' connector. Just simple use alert(scope.card). (Need to warn you that alert an object is not a good idea)
I have tried your code here: plunker. Changed a litte bit by using cardObj as string for easier presentation. Does it match your work?
You should watch the card object:
myApp.directive('clickmeee', function() {
return {
restrict: 'A',
scope: {
card: '#'
},
link: function(scope, element, attrs) {
scope.$watch('card', function(value) {
console.log(value);
});
}
};
});
And:
<div clickmeee id="feedContainer" card='{{cardObj}}'> </div>
Whenever the controller changes the cardObj, the directive's watch on card is triggered:
$scope.$apply(function() {
$scope.cardObj = "test";
}

How to access parent's controller function from within a custom directive using *parent's* ControllerAs?

I'm in need of building a transformation directive that transforms custom directives into html.
Input like: <link text="hello world"></link>
should output to: <a class="someclass" ng-click="linkClicked('hello world')"></a>
linkClicked should be called on the parent controller of the directive.
It would have been very easy if I was the one responsible for the html holding the 'link' directive (using isolated scope), but I'm not. It's an as-is input and I have to figure a way to still do it.
There are countless examples on how to do similar bindings using the default scope of the directive, but I'm writing my controllers using John Papa's recommendations with controllerAs, but don't want to create another instance on the controller in the directive.
This is what I have reached so far:
(function () {
'use strict';
angular
.module('app')
.directive('link', link);
link.$inject = ['$compile'];
function link($compile) {
return {
restrict: 'E',
replace: true,
template: '<a class="someclass"></a>',
terminal: true,
priority: 1000,
link: function (scope, element, attributes) {
element.removeAttr('link'); // Remove the attribute to avoid indefinite loop.
element.attr('ng-click', 'linkClicked(\'' + attributes.text + '\')');
$compile(element)(scope);
},
};
}
})();
$scope.linkClicked = function(text){...} in the parent controller works.
element.attr('ng-click', 'abc.linkClicked(..)') in the directive (where the parent's controllerAs is abc) - also works.
The problem is I don't know which controller will use my directive and can't hard-code the 'abc' name in it.
What do you suggest I should be doing?
It's difficult to understand from your question all the constraints that you are facing, but if the only HTML you get is:
<link text="some text">
and you need to generate a call to some function, then the function must either be:
assumed by the directive, or
conveyed to the directive
#1 is problematic because the user of the directive now needs to understand its internals. Still, it's possible if you assume that a function name is linkClicked (or whatever you want to call it), and the user of your directive would have to take special care to alias the function he really needs (could be done with "controllerAs" as well):
<div ng-controller="FooCtrl as foo" ng-init="linkClicked = foo.actualFunctionOfFoo">
...
<link text="some text">
...
</div>
app.directive("link", function($compile){
return {
transclude: "element", // remove the entire element
link: function(scope, element, attrs, ctrl){
var template = '<a class="someclass" ng-click="linkClicked(\'' +
attrs.text +
'\')">link</a>';
$compile(template)(scope, function(clone){
element.after(clone);
});
}
};
});
Demo
#2 is typically achieved via attributes, which isn't possible in your case. But you could also create a sort of "proxy" directive - let's call it onLinkClick - that could execute whatever expression you need:
<div ng-controller="FooCtrl as foo"
on-link-click="foo.actualFunctionOfFoo($data)">
...
<link text="some text">
...
</div>
The link directive now needs to require: "onLinkClick":
app.directive("link", function($compile){
return {
transclude: "element", // remove the entire element
scope: true,
require: "?^onLinkClick",
link: function(scope, element, attrs, ctrl){
if (!ctrl) return;
var template = '<a class="someclass" ng-click="localClick()">link</a>';
scope.localClick = function(){
ctrl.externalFn(attrs.text);
};
$compile(template)(scope, function(clone){
element.after(clone);
});
}
};
});
app.directive("onLinkClick", function($parse){
return {
restrict: "A",
controller: function($scope, $attrs){
var ctrl = this;
var expr = $parse($attrs.onLinkClick);
ctrl.externalFn = function(data){
expr($scope, {$data: data});
};
},
};
});
Demo
Notice that having a link directive would also execute on <link> inside <head>. So, make attempts to detect it and skip everything. For the demo purposes, I used a directive called blink to avoid this issue.

AngularJS $watch controller variable from a directive with scope

From the directive, I want to track changes to a controller variable using $watch.
I have created this jsfiddle. (https://jsfiddle.net/hqz1seqw/7/)
When the page loads, the controller and both directives $watch function gets called but when I change the radio buttons, only the controllers and dir-two $watch function gets called. Why isnt dir-ones $watch function being called?
I want both the directives $watch to fire however, I can only get one of them to (i.e. dir-two). Not sure what I need to change. Does it have something to do with isolated scope? Is there a better way of doing this?
AngularJS Code:
var mod = angular.module("myApp", []);
//Controller
mod.controller("myCtrl", function($scope){
$scope.tempformat = "C";
$scope.one="25 - dir-one";
$scope.$watch('tempformat', function(nv){
alert("nv from controller");
});
$scope.two="35 - dir-two";
});
//dir-one directive
mod.directive("dirOne", function(){
return{
restrict: 'E',
template: "<p>{{info}}</p>",
scope: {info: '='
},
link: function (scope, element, attr) {
scope.$watch('tempformat', function(nv){
alert("nv from directive-one");
if(scope.tempformat === "C"){
element.find("p").append("C");
}
else if(scope.tempformat === "F"){
element.find("p").append("F");
}
});
}
}});
//dir-two directive
mod.directive("dirTwo", function($window){
return{
restrict: "EA",
template: "<p></p>",
link: function (scope, element, attr) {
scope.$watch('tempformat', function(nv){
alert("nv from directive-two");
if(scope.tempformat === "C"){
element.find("p").append("C");
}
else if(scope.tempformat === "F"){
element.find("p").append("F");
}
});
}
}
});
HTML Code:
<div ng-app="myApp" ng-controller="myCtrl">
<h2>Temperature</h2>
<input type="radio" ng-model="tempformat" value="C"/> Celcius
<input type="radio" ng-model="tempformat" value="F"/> Farenheit
<dir-one info="one"></dir-one>
<dir-two info="two"></dir-two>
</div>
Does it have something to do with isolated scope?
The problem is the fact that dir-one separates its scope from the parent. There are some alternatives that can be done in this situation such as:
scope.$watch('$parent.tempformat', function(nv){ //...
which will look to the parent for the specified content.
Another alternative is to bind to the directive itself:
scope: {
info: '=',
tempformat: '='
},
and then in the html:
<dir-one info="one" tempformat="tempformat"></dir-one>
see: the documentation for more information. Particularly the Isolating the Scope of a Directive area.
Is there a better way of doing this?
In general isolate scopes help construct reusable components (as noted in the documentation) so if this is something that is being attempted (from the content noted in the answer) then I would support something along the lines of the second option where you can specify that watch content on the directive itself and consider that the "better" way of doing this.
From my experience, and this is solely my own preference, I would bind it to the directive since I usually isolate my scope(s) for a reason.

Triggering a function with ngClick within ngTransclude

I have an unordered list loaded with four items from an array while using ngRepeat. The anchor tag in the list item has a function in the ngClick attribute that fires up a message. The function call works well when used like this:
<ul>
<li ng-repeat="n in supsNames">
<a ng-click="myAlert(n.name)">{{n.name}}</a>
</li>
</ul>
I created a simple directive for inserting unordered lists with list items. The list is loaded just fine but the same functioned I previously mentioned does not fire up. The code is as follows:
<div list items="supsNames">
<a ng-click="myAlert({{item.name}})">{{item.name}}</a>
</div>
Here is my javascript and angularjs code:
var app = angular.module('myapp', []);
app.controller('myCtrl', function($scope) {
$scope.title = 'ngClick within ngTransclude';
$scope.supsNames = [
{"name" : "Superman"},
{"name" : "Batman"},
{"name" : "Aquaman"},
{"name" : "Flash"}
];
$scope.myAlert = function(name) {
alert('Hello ' + name + '!');
};
});
app.directive('list', function() {
return {
restrict: 'A',
scope: {
items: '='
},
templateUrl: 'list.html',
transclude: true,
link: function(scope, element, attrs, controller) {
console.log(scope);
}
};
});
I also have a plnkr in case you want to see what I tried to do:
http://plnkr.co/edit/ycaAUMggKZEsWaYjeSO9?p=preview
Thanks for any help.
I got the plunkr working. I'm not sure if its exactly what you're looking for. I copied the main code changes below.
Here's the plunkr:
http://plnkr.co/edit/GEiGBIMywkjWAaDMKFNq?p=preview
The modified directive looks like this now:
app.directive('list', function() {
return {
restrict: 'A',
scope: {
items: '=',
ctrlFn: '&' //this function is defined on controller
},
templateUrl: 'list.html',
transclude: true,
link: function(scope, element, attrs, controller) {
//directive fn that calls controller defined function
scope.dirFn = function(param) {
if(scope.ctrlFn && typeof scope.ctrlFn == 'function') { //make sure its a defined function
scope.ctrlFn( {'name': param} ); //not sure why param has to be passed this way
}
}
}
};
});
And here's how it's called in the html file that's bound to your controller:
<div list items="supsNames" ctrl-fn="myAlert(name)">
<a ng-click="dirFn(item.name)">{{item.name}}</a>
</div>
I think what was happening before is that you were trying to use a function defined in your controller within the isolated scope of the directive, so it wasn't working--that function was undefined in the directive. So what I did was added another parameter to the directive that accepts method binding (I think that's what its called) with the '&'.
So basically you pass your controller method to the directive, and that method gets invoked however you want by the directive defined method I creatively named "dirFn". I don't know if this is the best way per se, but I've used it in an existing project with good results ;)
you need to pass the function to the directive
scope: {
items: '=', 'myAlert': '='
},
The ng-repeat inside the template of the directive insert a new scope and it require to call transclude funcion manually to work. I suggest remove ng-repeat and make the transclusion manually passing a copy of the controller scope and setting the item on each copy:
for(var i=0,len=scope.items.length;i<len;i++){
var item=scope.items[i];
var itemScope=scope.$parent.$new();
$transcludeFn(itemScope, function (clone,scope) {
// be sure elements are inserted
// into html before linking
scope.item=item;
element.after(clone);
});
};
I edit the pluker and I hope that could be helpfull: http://plnkr.co/edit/97ueb8SFj3Ljyvx1a8U1?p=preview
For more info about transclusion see: Transclusion: $transcludeFn

Angularjs passing object to directive

Angular newbie here. I am trying to figure out what's going wrong while passing objects to directives.
here's my directive:
app.directive('walkmap', function() {
return {
restrict: 'A',
transclude: true,
scope: { walks: '=walkmap' },
template: '<div id="map_canvas"></div>',
link: function(scope, element, attrs)
{
console.log(scope);
console.log(scope.walks);
}
};
});
and this is the template where I call the directive:
<div walkmap="store.walks"></div>
store.walks is an array of objects.
When I run this, scope.walks logs as undefined while scope logs fine as an Scope and even has a walks child with all the data that I am looking for.
I am not sure what I am doing wrong here because this exact method has worked previously for me.
EDIT:
I've created a plunker with all the required code: http://plnkr.co/edit/uJCxrG
As you can see the {{walks}} is available in the scope but I need to access it in the link function where it is still logging as undefined.
Since you are using $resource to obtain your data, the directive's link function is running before the data is available (because the results from $resource are asynchronous), so the first time in the link function scope.walks will be empty/undefined. Since your directive template contains {{}}s, Angular sets up a $watch on walks, so when the $resource populates the data, the $watch triggers and the display updates. This also explains why you see the walks data in the console -- by the time you click the link to expand the scope, the data is populated.
To solve your issue, in your link function $watch to know when the data is available:
scope.$watch('walks', function(walks) {
console.log(scope.walks, walks);
})
In your production code, just guard against it being undefined:
scope.$watch('walks', function(walks) {
if(walks) { ... }
})
Update: If you are using a version of Angular where $resource supports promises, see also #sawe's answer.
you may also use
scope.walks.$promise.then(function(walks) {
if(walks) {
console.log(walks);
}
});
Another solution would be to add ControllerAs to the directive by which you can access the directive's variables.
app.directive('walkmap', function() {
return {
restrict: 'A',
transclude: true,
controllerAs: 'dir',
scope: { walks: '=walkmap' },
template: '<div id="map_canvas"></div>',
link: function(scope, element, attrs)
{
console.log(scope);
console.log(scope.walks);
}
};
});
And then, in your view, pass the variable using the controllerAs variable.
<div walkmap="store.walks" ng-init="dir.store.walks"></div>
Try:
<div walk-map="{{store.walks}}"></div>
angular.module('app').directive('walkMap', function($parse) {
return {
link: function(scope, el, attrs) {
console.log($parse(attrs.walkMap)(scope));
}
}
});
your declared $scope.store is not visible from the controller..you declare it inside a function..so it's only visible in the scope of that function, you need declare this outside:
app.controller('MainCtrl', function($scope, $resource, ClientData) {
$scope.store=[]; // <- declared in the "javascript" controller scope
ClientData.get({}, function(clientData) {
self.original = clientData;
$scope.clientData = new ClientData(self.original);
var storeToGet = "150-001 KT";
angular.forEach(clientData.stores, function(store){
if(store.name == storeToGet ) {
$scope.store = store; //declared here it's only visible inside the forEach
}
});
});
});

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