I have created a directive in which i am parsing a variable "count". In my page there is a dropdown and "count" gets updated whenever dropdown value is changed. I have created a directive to show "count". How can i update the directive whenever dropdown value is changed.
Code:
<stats count="{{self.shortenedCountArray[2].orignalCount}}"></stats>
Directive code:
(function() {
'use strict';
angular
.module('app.pages')
.directive('stats', stats);
stats.$inject = [ '$rootScope']
function stats( $rootScope) {
return {
restrict: 'E',
scope: {},
templateUrl: 'k2-modules/js/directives/templates/statsTemplate.html',
link: (scope, element, attrs) => {
scope.count = attrs.count;
}
}
}
})();
Any help will be appreciated.
Watchers requires some time so if you dont want to next cycle/trigger
use $apply
and adding timeout clasure may need at some situations.
link: (scope, element, attrs) => {
setTimeout ... if needed
scope.$apply(function () {
scope.count = attrs.count;
});
Related
I have a controller:
function myController($scope) {
$scope.clicked = false;
}
and a directive:
function myDirective() {
return {
restrict: 'E',
link: function(scope, elem, attrs) {
elem.bind('click', function() {
// need to update controller $scope.clicked value
});
},
template: '<div>click me</div>';
replace: true;
}
}
and I´m using it like this:
<div ng-controller="myController">
<my-directive></my-directive>
</div>
How can I change the controller value of $scope.clicked ?
thanks!
As you don't use isolated scope in your directive, you can use scope.$parent.clicked to access the parent scope property.
link: function(scope, elem, attrs) {
elem.bind('click', function() {
scope.$parent.clicked = ...
});
},
I would not recommend using scope.$parent to update or access the parent scope values, you can two way bind the controller variable that needs to be updated into your directive, so your directive becomes:
function myDirective() {
return {
restrict: 'E',
scope: {
clicked: '='
},
link: function(scope, elem, attrs) {
elem.bind('click', function() {
// need to update controller $scope.clicked value
$scope.clicked = !$scope.clicked;
});
},
template: '<div>click me</div>';
replace: true;
}
}
now pass this clicked from parent:
<div ng-controller="myController as parentVm">
<my-directive clicked="parentVm.clicked"></my-directive>
</div>
function myController() {
var parentVm = this;
parentVm.clicked = false;
}
I would recommend reading up on using controllerAs syntax for your controller as that would really solidify the concept of using two way binding here.
I like to use $scope.$emit for such purposes. It allows to send data from directive to the controller.
You should create custom listener in your controller:
$scope.$on('cliked-from-directive', function(event, data){
console.log(data)
})
As you can see, now you have full access to your controller scope and you can do whatever you want. And in your directive just to use scope.$emit
link: function(scope, elem, attrs) {
elem.bind('click', function() {
scope.$emit('cliked-from-directive', {a:10})
});
Here I've created jsfiddle for you
I have the following code:
<div id='parent'>
<div id='child1'>
<my-select></my-select>
</div>
<div id='child2'>
<my-input></my-input>
</div>
</div>
I also have two directives which get some data from the data factory. I need the two directives to talk to each other such that when a value in select box is changed the input in changes accordingly.
Here's my two directives:
.directive("mySelect", function ($compile) {
return {
restrict: 'E',
scope:'=',
template: " <select id='mapselectdropdown'>\
<option value=map1>map1</option> \
<option value=map2>map2</option> \
</select>'",
link: function (scope, element, attrs) {
scope.selectValue = //dont konw how to get the value of the select
}
};
})
.directive("myInput", function($compile) {
return {
restrict: 'E',
controller: ['$scope', 'dataService', function ($scope, dataService) {
dataService.getLocalData().then(function (data) {
$scope.masterData = data.input;
});
}],
template: "<input id='someInput'></input>",
link: function (scope, element, attrs) {
//here I need to get the select value and assign it to the input
}
};
})
This would essentially do the onchange() function that you can add on selects. any ideas?
You could use $rootScope to broadcast a message that the other controller listens for:
// Broadcast with
$rootScope.$broadcast('inputChange', 'new value');
// Subscribe with
$rootScope.$on('inputChange', function(newValue) { /* do something */ });
Read Angular docs here
Maybe transclude the directives to get access to properties of outer scope where you define the shared variable ?
What does this transclude option do, exactly? transclude makes the contents of a directive with this option have access to the scope outside of the directive rather than inside.
-> https://docs.angularjs.org/guide/directive
After much research this is what worked...
I added the following:
.directive('onChange', function() {
return {
restrict: 'A',
scope:{'onChange':'=' },
link: function(scope, elm, attrs) {
scope.$watch('onChange', function(nVal) { elm.val(nVal); });
elm.bind('blur', function() {
var currentValue = elm.val();
if( scope.onChange !== currentValue ) {
scope.$apply(function() {
scope.onChange = currentValue;
});
}
});
}
};
})
Then on the element's link function I added:
link: function (scope, elm, attrs) {
scope.$watch('onChange', function (nVal) {
elm.val(nVal);
});
}
Last added the attribute that the values would get set to in the scope:
<select name="map-select2" on-change="mapId" >
Is there a way for not losing connection to the current controller when you are wrapping data with a directive ?
My problem is, that the directive within the wrapped template has no connection to the outside controller any more and so I can not execute the function.
Wrapping Directive:
myApp.directive('wrapContent', function() {
return {
restrict: "E",
scope: {
model: "=",
datas: "="
},
templateUrl: "./any/template.php",
link: function(scope, element, attr) {
// any
}
};
});
Directive within the wrapped Template
myApp.directive('doAction', function() {
return {
restrict: "A",
link: function(scope, elem, attrs) {
$(elem).click(function(e) {
scope.$apply(attrs.doAction);
});
}
}
});
Conroller:
lmsApp.controller('OutsideController', function ($scope){
$sope.sayHello = function() {
alert("hello");
};
});
HTML where I want to execute the function (template.php):
<div>
<do-action="sayHello()"></do-action>
</div>
How I call the wrapContent directive which is outside (Updated):
<div ng-controller="OutsideController">
<wrap-content model="any" datas="data_any"></wrap-content>
</div>
How can I execute the sayHello() function?
Thank you for your help! I would appreciate every answer.
wrapContent directive will be processed with the scope of controller.
DoAction directive will be processed with the isolateScope of wrapContent directive.
Solution1:
Get a reference to the sayHello function in wrapContent using '&' and execute it in event handler.
Solution2:
Instead of using scope in your event handler, use scope.$parent.
You should pass sayHallo function to your parent directive using &
myApp.directive('wrapContent', function() {
return {
restrict: "E",
scope: {
model: "=",
datas: "=",
sayHallo: "&"
},
templateUrl: "./any/template.php",
link: function(scope, element, attr) {
// any
}
};
});
HTML
<div ng-controller="OutsideController">
<wrap-content model="any" datas="data_any" sayHallo="sayHallo()"></wrap-content>
</div>
Then in your child directive, you will have sayHallo in your scope, to call it just do it this:
myApp.directive('doAction', function() {
return {
restrict: "A",
link: function(scope, elem, attrs) {
scope.sayHallo();
}
}
});
And you dont need pass it again. So your child directive should looks like this:
<div>
<do-action></do-action>
</div>
UPDATE
If you want to use all your parent model functions,without passing each function. In your child directive,just use scope.model to have access to model attributes and functions.
myApp.directive('doAction', function() {
return {
restrict: "A",
link: function(scope, elem, attrs) {
scope.model.sayHallo();
}
}
});
Whats the best way to assign a new value through a directive? A two way databinding.
I have a fiddle here where i tried. http://jsfiddle.net/user1572526/grLfD/2/ . But it dosen't work.
My directive:
myApp.directive('highlighter', function () {
return {
restrict: 'A',
replace: true,
scope: {
activeInput: '='
},
link: function (scope, element, attrs) {
element.bind('click', function () {
scope.activeInput = attrs.setInput
})
}
}
});
And my controller:
function MyCtrl($scope) {
$scope.active = {
value : true
};
}
And my view:
<h1 highlighter active-input="active.value" set-input="false">Click me to update Value in scope: {{active}}</h1>
So what i wanna do is update the scope.active with the given attribute setInput.
Any ideas what I'm doing wrong here?
With element.bind you leave the realm of Angular, so you need to tell Angular that something had happened. You do that with the scope.$apply function:
scope.$apply(function(){
scope.activeInput = attrs.setInput;
});
here is an updated jsfiddle.
I have an angular directive which is initialized like so:
<conversation style="height:300px" type="convo" type-id="{{some_prop}}"></conversation>
I'd like it to be smart enough to refresh the directive when $scope.some_prop changes, as that implies it should show completely different content.
I have tested it as it is and nothing happens, the linking function doesn't even get called when $scope.some_prop changes. Is there a way to make this happen ?
Link function only gets called once, so it would not directly do what you are expecting. You need to use angular $watch to watch a model variable.
This watch needs to be setup in the link function.
If you use isolated scope for directive then the scope would be
scope :{typeId:'#' }
In your link function then you add a watch like
link: function(scope, element, attrs) {
scope.$watch("typeId",function(newValue,oldValue) {
//This gets called when data changes.
});
}
If you are not using isolated scope use watch on some_prop
What you're trying to do is to monitor the property of attribute in directive. You can watch the property of attribute changes using $observe() as follows:
angular.module('myApp').directive('conversation', function() {
return {
restrict: 'E',
replace: true,
compile: function(tElement, attr) {
attr.$observe('typeId', function(data) {
console.log("Updated data ", data);
}, true);
}
};
});
Keep in mind that I used the 'compile' function in the directive here because you haven't mentioned if you have any models and whether this is performance sensitive.
If you have models, you need to change the 'compile' function to 'link' or use 'controller' and to monitor the property of a model changes, you should use $watch(), and take of the angular {{}} brackets from the property, example:
<conversation style="height:300px" type="convo" type-id="some_prop"></conversation>
And in the directive:
angular.module('myApp').directive('conversation', function() {
return {
scope: {
typeId: '=',
},
link: function(scope, elm, attr) {
scope.$watch('typeId', function(newValue, oldValue) {
if (newValue !== oldValue) {
// You actions here
console.log("I got the new value! ", newValue);
}
}, true);
}
};
});
I hope this will help reloading/refreshing directive on value from parent scope
<html>
<head>
<!-- version 1.4.5 -->
<script src="angular.js"></script>
</head>
<body ng-app="app" ng-controller="Ctrl">
<my-test reload-on="update"></my-test><br>
<button ng-click="update = update+1;">update {{update}}</button>
</body>
<script>
var app = angular.module('app', [])
app.controller('Ctrl', function($scope) {
$scope.update = 0;
});
app.directive('myTest', function() {
return {
restrict: 'AE',
scope: {
reloadOn: '='
},
controller: function($scope) {
$scope.$watch('reloadOn', function(newVal, oldVal) {
// all directive code here
console.log("Reloaded successfully......" + $scope.reloadOn);
});
},
template: '<span> {{reloadOn}} </span>'
}
});
</script>
</html>
angular.module('app').directive('conversation', function() {
return {
restrict: 'E',
link: function ($scope, $elm, $attr) {
$scope.$watch("some_prop", function (newValue, oldValue) {
var typeId = $attr.type-id;
// Your logic.
});
}
};
}
If You're under AngularJS 1.5.3 or newer, You should consider to move to components instead of directives.
Those works very similar to directives but with some very useful additional feautures, such as $onChanges(changesObj), one of the lifecycle hook, that will be called whenever one-way bindings are updated.
app.component('conversation ', {
bindings: {
type: '#',
typeId: '='
},
controller: function() {
this.$onChanges = function(changes) {
// check if your specific property has changed
// that because $onChanges is fired whenever each property is changed from you parent ctrl
if(!!changes.typeId){
refreshYourComponent();
}
};
},
templateUrl: 'conversation .html'
});
Here's the docs for deepen into components.