Passing Object to directive through attribute and containing variable - javascript

I wanna transfer a $scope.data to directive through its attribute in a Object, Can I achieve below format with any solution but not through separated attribute?
<custom-directive detail="{index:1, data: {{data}}}">
</custom-directive>
And the scope is set to below in directive
scope: {detail: "="}

One solution could be
return {
restrict: 'E',
require: 'ngModel',
scope: {
model: '=ngModel',
},
link: function(scope, element, attributes, ngModel) {
if (!ngModel) {
return;
}
console.log(scope.model); // your passed data
}
}
and then
<custom-directive ngModel="data"></custom-directive>
Now you will have your $scope.data passed to the directive inside scope.model. But note that, any change in scope.model in directive will reflect in $scope.data too.
To avoid that, you can simpley change ngModel.
return {
restrict: 'E',
scope: {
data: '=myData',
},
link: function(scope, element, attributes) {
console.log(scope.data); // your passed data
}
}
and then
<custom-directive my-data="data"></custom-directive>

You just write data only in your object, it will automatically resolves from your controller. Do as below:
HTML
<custom-directive detail="{index:1, data: data}">
</custom-directive>
Directive
myApp.directive('customDirective', function() {
return {
restrict:"AE",
scope:{
detail:"="
},
link:function(scope,ele,attrs) {
alert(JSON.stringify(scope.detail));
}
}
});
Fiddle Demo

You still have the solution to create your object in your controller :
$scope.detail = {index:1, data:$scope.data};
and to give it to your directive :
<custom-directive detail="detail"></custom-directive>

Related

Can't access attr data in angular custom directive link function

I'm trying to access attr data defined by a controller in a custom directive's link function.
Here is some simple angular markup:
<div class='barChart'>
{{vm.totals}}
<bar-chart chart-data='vm.totals'></bar-chart
</div>
This is the directive defintion:
angular
.module('app')
.directive('barChart', [Callback])
function Callback() {
return {
restrict: 'E',
replace: false,
scope: {data: '=chartData'},
link: (scope, el, attrs) => {
console.log(scope);
console.log(el);
console.log(attrs.chartData);
}
}
}
When I log scope, I can see the data array in this object as expected, heres a picture:
As you can see the data is the 10 item array at the bottom. The array also shows up in the browser, so the data is there. However, as soon as I change the console.log to log that property:
console.log(scope.data)
The value that gets printed is undefined. I'm trying to access the data in the link function so that I can use d3 to create a visualization. The data is there, but it's undefined as soon as I call .data on scope. Any ideas?
Use $watch to log the data:
angular
.module('app')
.directive('barChart', [Callback])
function Callback() {
return {
restrict: 'E',
replace: false,
scope: {data: '=chartData'},
link: (scope, el, attrs) => {
console.log(scope);
console.log(el);
console.log(attrs.chartData);
//USE $watch
scope.$watch("data", function(value) {
console.log(value);
});
}
}
}
use # in the link function to have one way binding to the controller.
angular
.module('app', [])
.controller('ctrl', function($scope){$scope.totals="1234";})
.directive('barChart', [Callback])
function Callback() {
return {
restrict: 'E',
replace: false,
scope: {data: '#'},
link: function(scope, el, attrs) {
console.log(attrs.chartData);
}
}
}
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="app" ng-controller="ctrl">
<div class='barChart'>
{{totals}}
<bar-chart chart-data='{{totals}}'></bar-chart>
</div>
</div>
you can access vm.totals as scope variable but passed as attribute:
scope: {
chartData: '=' //# reads the attribute value
}
And in your html:
<bar-chart chart-data='vm.totals'></bar-chart>
Now in link function you can access it:
console.log(scope.chartData);
Note that this is one way binding, so if you need two way you need to use = instead.
Update:
If you are using async call you need to use two way binding or watch for the changes in your link function:
scope.$watch('chartData', function(newVal) {
if(newVal) { console.log(scope.chartData) }
}, true);
Note that since it is an array it is better to use collection watch (true as the last arg).

how to pass multiple scope variables into custom directive in angularjs

I am trying to pass 2 scope variables from controller into a custom directive and having problem in accessing both of them.Model is same for the directive and controller.
Here is the code:
Html:
<myDirective data="var1" item="var2"></myDirective>
Controller:
$scope.var1="abc";
$scope.var2="xyz";
Directive:
app.directive('myDirective', function () {
return {
restrict: 'E', //E = element, A = attribute, C = class, M = comment
scope: {
var1: '='
var2:'='
},
templateUrl: 'myTemplate.html',
link: function ($scope, element, attrs) {
}
}
});
TemplateUrl: myTemplate.html
<div>{{var1}}</div> // This works
<div>{{var2}}</div> // This doesn't works
Any idea how can I use both?
Make these changes in your code
<popover data="var1" item="var2"></popover>
JS
app.directive('popover', function () {
return {
restrict: 'E', //E = element, A = attribute, C = class, M = comment
scope: {
data: '=',
item: '='
},
templateUrl: 'myTemplate.html',
link: function (scope, element, attrs) {
console.log(scope.data, scope.item);
}
}
});
Change your template to match the names declared in the DDO.
<myDirective var1="var1" var2="var2"></myDirective>
Avoid using data as an attribute name. That is a reserved prefix that is stripped during normalization. For more information on attribute normilization, see AngularJS Developer Guide - Directive Normilization.

Accessing parent formController in angular directive controller

In this question I have found how to access parent form within link in a directive. But I need it in my controller and access to form validation, so I implement this:
return {
restrict: 'A',
require: '?^form',
replace: true,
scope: {
someVariable: '='
},
link: function (scope, element, attrs, formCtrl) {
scope.formCtrl = formCtrl;
},
controller: function ($scope) {
$scope.someMethod = function () {
if ($scope.formCtrl.$valid) {
//Do something
}
}
}
};
It´s the correct way to do that? there's a better way?
EDIT: I need isolated scope and I´m actually using require: '?^form'

Update $watch using require in angular directive

as an angular newbie this is my problem
If I have two directives in HTML like this
<parent-dir param="par">
<child-dir></child-dir>
</parent-dir>
and in JS like this (in parent)
app.directive('parentDir', function(){
return {
restrict: 'E',
scope: {
param: '='
}
}
})
and in child
app.directive('childDir', function(){
return {
restrict: 'E',
require: '^parentDir',
controller: function($scope, $element){
<-- SHOULD I PUT WATCHER HERE -->
},
link: function(scope, element, attrs, parentdirCtrl){
<-- SHOULD I PUT WATCHER HERE -->
}
}
})
where in the child directive should I make an optional $watch in order to catch all changes to the param model?
Off course if I use $watch in the parent controller, all changes in the param are reflected in the parent directive but I can`t seem to find a way to pass this information to child directive.
You should place it inside the link function which have access of the parent controller using 4th parameter of link function parentdirCtrl. Actually you don't need to worry about the params variable because it uses = two way binding inside directive that does update the value in both parent controller scope & directive scope. Additionally you need define controller in your parentDir directive so that the scope of parentDir directive shared with the childDir.
Code
app.directive('childDir', function() {
return {
restrict: 'E',
require: '^parentDir',
template: '<div class="test">INner {{param}}</div>',
controller: function($scope, $element) {
},
link: function(scope, element, attrs, parentdirCtrl) {
scope.$watch('param', function(newVal, oldVal) {
console.log(newVal);
}) //true only if its object.
}
}
})
Demo Plunkr

AngularJs: Iterating over array inside directive in order to create nested set of directives

Inside angularJS directive I'm trying to iterate over array and based on values I would like to create nested list of directives.
Current version of directive
Directive type
.directive("type", function($compile, $log){
return{
restrict: "E",
replace: true,
transclude: true,
scope: {
type: '='
},
template: "<div></div>",
link: function(scope, element, attrs){
if (angular.isArray(scope.type)){
angular.forEach(scope.type, function(value, index){
$log.error(value);
element.append("<type type='scope.type['"+index+"]'></type>");
});
} else if (angular.isObject(scope.type)){
element.append("OBJECT")
} else {
element.append("<div>{{scope.type}}</div>")
}
$compile(element.contents())(scope)
}
};
})
I also tried to use above directive with next version of link function:
if (angular.isArray(scope.type)) {
element.append("<div ng-repeat='element in scope.type'><type type='element'></type></div>");
} else if (angular.isObject(scope.type)) {
element.append("OBJECT")
} else {
element.append("<div>{{scope.type}}</div>")
}
$compile(element.contents())(scope)
}
None of provided codes solve my issue.
Below you will find example explaining on specific case:
Let's say that I had next object in the scope.type = [null,"int"]. Now I would like to use <type type='type'><type> and as a result of first evaluation I want to have sth like:
<type type='type[0]'></type><type type='type[1]'></type>
Further evaluation of those values should lead to some simpler form but right now it is not important.
How I can achieve sth like this?
Edit
I tried even to exctract part of the code responsible for iteration to the seperate directive but it still does not work. Code:
Update link function in type directive:
link: function(scope, element, attrs) {
if (angular.isArray(scope.type)) {
element.append("<typeb type='scope.type'></typeb>")
} else if (angular.isObject(scope.type)) {
element.append("OBJECT")
} else {
element.append("<div>{{scope.type}}</div>")
}
$compile(element.contents())(scope)
}
New directive:
.directive("typeb", function($compile, $log){
return{
restrict: "E",
replace: true,
transclude: true,
scope: {
type: '='
},
template: "<div ng-repeat='t in type'>{{t}}</div>",
};
})
Problem still occurs but generated html contains only next pieces as a result of typeb directive:
<!-- ngRepeat: t in type -->
The problem you are getting is <!-- ngRepeat: t in type --> this is because your type didn't contains any value, when it is inside typeb directive
Your directive shouldn't be use scope.variable on view.
Scope variable will be directly accessible by their name like
{{type}} or <typeb type='type'></typeb>
Change your link code to below.
Directive link
link: function(scope, element, attrs) {
if (angular.isArray(scope.type)) {
element.append("<typeb type='type'></typeb>")
} else if (angular.isObject(scope.type)) {
element.append("OBJECT")
} else {
element.append("<div>{{type}}</div>")
}
$compile(element.contents())(scope)
}
Thanks.
Use an ng-repeat in the template
<your-directive attr="item.someattr" ng-repeat="item in items"></your-directive>
.directive("type", function($compile, $log){
return{
restrict: "E",
replace: true,
transclude: true,
scope: {
type: '='
},
template: "NG REPEAT HERE",
...
})

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