Is it possible to call a method directly on a specific directive if the ID of that specific directive is known? I know how to do it through listener events (broadcast or emit). I suppose I could do my manipulation using jQuery but I'd like to be able to do it only through Angular. Also, I'd like to avoid the listener event because it seems "wasteful" for every instance of that directive to have to determine if that particular event "belongs" to them.
HTML
<custom-element ce-Id="5"></custom-element>
<custom-element ce-Id="6"></custom-element>
<custom-element ce-Id="7"></custom-element>
<custom-element ce-Id="8"></custom-element>
<custom-element ce-Id="9"></custom-element>
<custom-element ce-Id="10"></custom-element>
So using the example above, is it possible for an event on directive ce-Id="6" (say a click event) to trigger something to happen specifically on ce-Id="7" without using a listener?
You can define a custom API in the factory function of the directive and keep track of subscribers. This code will only run once. Can move it to a service as well.
Example:
app.directive('customElement', function() {
var subscribers = {};
var subscribe = function(id, callback) {
subscribers[id] = callback;
};
var unsubscribe = function(id) {
subscribers[id] = null;
};
var notify = function(id) {
var target = parseInt(id) + 1;
var action = subscribers[target];
if (action) action();
};
var api = {
subscribe: subscribe,
unsubscribe: unsubscribe,
notify: notify
};
return {
restrict: 'E',
template: '<div>I am custom element: {{ ceId }}</div>',
scope: {
ceId: '#',
},
link: function(scope, element, attrs) {
var id = scope.ceId;
if (!id) return;
var onReceive = function() {
console.log('customElement ' + id + ' has received notification.');
};
api.subscribe(id, onReceive);
var onClick = function() {
scope.$apply(function () {
api.notify(id);
});
};
element.on('click', onClick);
scope.$on('$destroy', function() {
element.off('click', onClick);
api.unsubscribe(id);
});
}
};
});
Demo: http://plnkr.co/edit/2s1bkToSuHPURQUcvZcd?p=preview
How can i be notified when a directive is resized?
i have tried
element[0].onresize = function() {
console.log(element[0].offsetWidth + " " + element[0].offsetHeight);
}
but its not calling the function
(function() {
'use strict';
// Define the directive on the module.
// Inject the dependencies.
// Point to the directive definition function.
angular.module('app').directive('nvLayout', ['$window', '$compile', layoutDirective]);
function layoutDirective($window, $compile) {
// Usage:
//
// Creates:
//
var directive = {
link: link,
restrict: 'EA',
scope: {
layoutEntries: "=",
selected: "&onSelected"
},
template: "<div></div>",
controller: controller
};
return directive;
function link(scope, element, attrs) {
var elementCol = [];
var onSelectedHandler = scope.selected();
element.on("resize", function () {
console.log("resized.");
});
$(window).on("resize",scope.sizeNotifier);
scope.$on("$destroy", function () {
$(window).off("resize", $scope.sizeNotifier);
});
scope.sizeNotifier = function() {
alert("windows is being resized...");
};
scope.onselected = function(id) {
onSelectedHandler(id);
};
scope.$watch(function () {
return scope.layoutEntries.length;
},
function (value) {
//layout was changed
activateLayout(scope.layoutEntries);
});
function activateLayout(layoutEntries) {
for (var i = 0; i < layoutEntries.length; i++) {
if (elementCol[layoutEntries[i].id]) {
continue;
}
var div = "<nv-single-layout-entry id=slot" + layoutEntries[i].id + " on-selected='onselected' style=\"position:absolute;";
div = div + "top:" + layoutEntries[i].position.top + "%;";
div = div + "left:" + layoutEntries[i].position.left + "%;";
div = div + "height:" + layoutEntries[i].size.height + "%;";
div = div + "width:" + layoutEntries[i].size.width + "%;";
div = div + "\"></nv-single-layout-entry>";
var el = $compile(div)(scope);
element.append(el);
elementCol[layoutEntries[i].id] = 1;
}
};
}
function controller($scope, $element) {
}
}
})();
Use scope.$watch with a custom watch function:
scope.$watch(
function () {
return [element[0].offsetWidth, element[0].offsetHeight].join('x');
},
function (value) {
console.log('directive got resized:', value.split('x'));
}
)
You would typically want to watch the element's offsetWidth and offsetHeight properties. With more recent versions of AngularJS, you can use $scope.$watchGroup in your link function:
app.directive('myDirective', [function() {
function link($scope, element) {
var container = element[0];
$scope.$watchGroup([
function() { return container.offsetWidth; },
function() { return container.offsetHeight; }
], function(values) {
// Handle resize event ...
});
}
// Return directive definition ...
}]);
However, you may find that updates are quite slow when watching the element properties directly in this manner.
To make your directive more responsive, you could moderate the refresh rate by using $interval. Here's an example of a reusable service for watching element sizes at a configurable millisecond rate:
app.factory('sizeWatcher', ['$interval', function($interval) {
return function (element, rate) {
var self = this;
(self.update = function() { self.dimensions = [element.offsetWidth, element.offsetHeight]; })();
self.monitor = $interval(self.update, rate);
self.group = [function() { return self.dimensions[0]; }, function() { return self.dimensions[1]; }];
self.cancel = function() { $interval.cancel(self.monitor); };
};
}]);
A directive using such a service would look something like this:
app.directive('myDirective', ['sizeWatcher', function(sizeWatcher) {
function link($scope, element) {
var container = element[0],
watcher = new sizeWatcher(container, 200);
$scope.$watchGroup(watcher.group, function(values) {
// Handle resize event ...
});
$scope.$on('$destroy', watcher.cancel);
}
// Return directive definition ...
}]);
Note the call to watcher.cancel() in the $scope.$destroy event handler; this ensures that the $interval instance is destroyed when no longer required.
A JSFiddle example can be found here.
Here a sample code of what you need to do:
APP.directive('nvLayout', function ($window) {
return {
template: "<div></div>",
restrict: 'EA',
link: function postLink(scope, element, attrs) {
scope.onResizeFunction = function() {
scope.windowHeight = $window.innerHeight;
scope.windowWidth = $window.innerWidth;
console.log(scope.windowHeight+"-"+scope.windowWidth)
};
// Call to the function when the page is first loaded
scope.onResizeFunction();
angular.element($window).bind('resize', function() {
scope.onResizeFunction();
scope.$apply();
});
}
};
});
The only way you would be able to detect size/position changes on an element using $watch is if you constantly updated your scope using something like $interval or $timeout. While possible, it can become an expensive operation, and really slow your app down.
One way you could detect a change on an element is by calling
requestAnimationFrame.
var previousPosition = element[0].getBoundingClientRect();
onFrame();
function onFrame() {
var currentPosition = element[0].getBoundingClientRect();
if (!angular.equals(previousPosition, currentPosition)) {
resiszeNotifier();
}
previousPosition = currentPosition;
requestAnimationFrame(onFrame);
}
function resiszeNotifier() {
// Notify...
}
Here's a Plunk demonstrating this. As long as you're moving the box around, it will stay red.
http://plnkr.co/edit/qiMJaeipE9DgFsYd0sfr?p=preview
A slight variation on Eliel's answer worked for me. In the directive.js:
$scope.onResizeFunction = function() {
};
// Call to the function when the page is first loaded
$scope.onResizeFunction();
angular.element($(window)).bind('resize', function() {
$scope.onResizeFunction();
$scope.$apply();
});
I call
$(window).resize();
from within my app.js. The directive's d3 chart now resizes to fill the container.
Here is my take on this directive (using Webpack as bundler):
module.exports = (ngModule) ->
ngModule.directive 'onResize', ['Callback', (Callback) ->
restrict: 'A'
scope:
onResize: '#'
onResizeDebounce: '#'
link: (scope, element) ->
container = element[0]
eventName = scope.onResize || 'onResize'
delay = scope.onResizeDebounce || 1000
scope.$watchGroup [
-> container.offsetWidth ,
-> container.offsetHeight
], _.debounce (values) ->
Callback.event(eventName, values)
, delay
]
I am trying to write a directive that will do a simple in-place edit for an element. This is my code so far:
directive('clickEdit', function() {
return {
restrict: 'A',
template: '<span ng-show="inEdit"><input ng-model="editModel"/></span>' +
'<span ng-show="!inEdit" ng-click="edit()">{{ editModel }}</span>',
scope: {
editModel: "=",
inEdit: "#"
},
link: function(scope, element, attr) {
scope.inEdit = false;
var savedValue = scope.editModel;
var input = element.find('input');
input.bind('keyup', function(e) {
if ( e.keyCode === 13 ) {
scope.save();
} else if ( e.keyCode === 27 ) {
scope.cancel();
}
});
scope.edit = function() {
scope.inEdit = true;
setTimeout(function(){
input[0].focus();
input[0].select();
}, 0);
};
scope.save = function() {
scope.inEdit = false;
};
scope.cancel = function() {
scope.inEdit = false;
scope.editModel = savedValue;
};
}
}
})
The scope.edit function sets inEdit to true, and that works well - it hides the text and shows the input tag. However, the scope.save function, which sets scope.inEdit to false does not work at all. It does not hide the input tag and show the text.
Why?
You are calling scope.save() from a event handler reacting to the keyup event. However this event handler is not called by/through the AngularJS framework. AngularJS will only scan for changes of the model if it believes that changes might have occured in order to lessen the workload (AngularJS as of now does dirty-checking with is computational intensive).
Therefore you must make use of the scope.$apply feature to make AngularJS aware that you are doing changes to the scope. Change the scope.save function to this and it shall work:
scope.save = function(){
scope.$apply(function(){
scope.inEdit = false;
});
});
Also it appears that there is actually no need to bind this save function to a scope variable. So you might want to instead define a "normal" function or just integrate the code into your event handler.
I'm new to Angular, and I'm trying to get the XY coordinates of a tap using angular-hammer.js directives. Here's how the directives are set up:
var hmTouchevents = angular.module('hmTouchevents', []),
hmGestures = ['hmHold:hold',
'hmTap:tap',
'hmDoubletap:doubletap',
'hmDrag:drag',
'hmDragup:dragup',
'hmDragdown:dragdown',
'hmDragleft:dragleft',
'hmDragright:dragright',
'hmSwipe:swipe',
'hmSwipeup:swipeup',
'hmSwipedown:swipedown',
'hmSwipeleft:swipeleft',
'hmSwiperight:swiperight',
'hmTransform:transform',
'hmRotate:rotate',
'hmPinch:pinch',
'hmPinchin:pinchin',
'hmPinchout:pinchout',
'hmTouch:touch',
'hmRelease:release'];
angular.forEach(hmGestures, function(name){
var directive = name.split(':'),
directiveName = directive[0],
eventName = directive[1];
hmTouchevents.directive(directiveName, ["$parse", function($parse) {
return {
scope: true,
link: function(scope, element, attr) {
var fn, opts;
fn = $parse(attr[directiveName]);
opts = $parse(attr["hmOptions"])(scope, {});
scope.hammer = scope.hammer || Hammer(element[0], opts);
return scope.hammer.on(eventName, function(event) {
return scope.$apply(function() {
return fn(scope, {
$event: event
});
});
});
}
};
}
]);
});
My html looks like this:
<div ng-controller="IndexCtrl" >
<div class='tap-area' hm-tap="tap();">
</div>
</div>
My controller looks like this:
App.controller('IndexCtrl', function ($scope, Myapp) {
$scope.tap = function(ev){
//How do I get the event.gesture.center.pageX in here?
};
});
I figured out how to make this work. After return scope.hammer.on(eventName, function(event) { I added scope.event = event; and then in my controller I can get XY coords of a tap by using this.event.center.pageX or this.event.center.pageY.
It was posted long time ago but here is another solution.
Just add $event to your html
I tried to use ng-model on input tag with type file:
<input type="file" ng-model="vm.uploadme" />
But after selecting a file, in controller, $scope.vm.uploadme is still undefined.
How do I get the selected file in my controller?
I created a workaround with directive:
.directive("fileread", [function () {
return {
scope: {
fileread: "="
},
link: function (scope, element, attributes) {
element.bind("change", function (changeEvent) {
var reader = new FileReader();
reader.onload = function (loadEvent) {
scope.$apply(function () {
scope.fileread = loadEvent.target.result;
});
}
reader.readAsDataURL(changeEvent.target.files[0]);
});
}
}
}]);
And the input tag becomes:
<input type="file" fileread="vm.uploadme" />
Or if just the file definition is needed:
.directive("fileread", [function () {
return {
scope: {
fileread: "="
},
link: function (scope, element, attributes) {
element.bind("change", function (changeEvent) {
scope.$apply(function () {
scope.fileread = changeEvent.target.files[0];
// or all selected files:
// scope.fileread = changeEvent.target.files;
});
});
}
}
}]);
I use this directive:
angular.module('appFilereader', []).directive('appFilereader', function($q) {
var slice = Array.prototype.slice;
return {
restrict: 'A',
require: '?ngModel',
link: function(scope, element, attrs, ngModel) {
if (!ngModel) return;
ngModel.$render = function() {};
element.bind('change', function(e) {
var element = e.target;
$q.all(slice.call(element.files, 0).map(readFile))
.then(function(values) {
if (element.multiple) ngModel.$setViewValue(values);
else ngModel.$setViewValue(values.length ? values[0] : null);
});
function readFile(file) {
var deferred = $q.defer();
var reader = new FileReader();
reader.onload = function(e) {
deferred.resolve(e.target.result);
};
reader.onerror = function(e) {
deferred.reject(e);
};
reader.readAsDataURL(file);
return deferred.promise;
}
}); //change
} //link
}; //return
});
and invoke it like this:
<input type="file" ng-model="editItem._attachments_uri.image" accept="image/*" app-filereader />
The property (editItem.editItem._attachments_uri.image) will be populated with the contents of the file you select as a data-uri (!).
Please do note that this script will not upload anything. It will only populate your model with the contents of your file encoded ad a data-uri (base64).
Check out a working demo here:
http://plnkr.co/CMiHKv2BEidM9SShm9Vv
How to enable <input type="file"> to work with ng-model
Working Demo of Directive that Works with ng-model
The core ng-model directive does not work with <input type="file"> out of the box.
This custom directive enables ng-model and has the added benefit of enabling the ng-change, ng-required, and ng-form directives to work with <input type="file">.
angular.module("app",[]);
angular.module("app").directive("selectNgFiles", function() {
return {
require: "ngModel",
link: function postLink(scope,elem,attrs,ngModel) {
elem.on("change", function(e) {
var files = elem[0].files;
ngModel.$setViewValue(files);
})
}
}
});
<script src="//unpkg.com/angular/angular.js"></script>
<body ng-app="app">
<h1>AngularJS Input `type=file` Demo</h1>
<input type="file" select-ng-files ng-model="fileArray" multiple>
<code><table ng-show="fileArray.length">
<tr><td>Name</td><td>Date</td><td>Size</td><td>Type</td><tr>
<tr ng-repeat="file in fileArray">
<td>{{file.name}}</td>
<td>{{file.lastModified | date : 'MMMdd,yyyy'}}</td>
<td>{{file.size}}</td>
<td>{{file.type}}</td>
</tr>
</table></code>
</body>
This is an addendum to #endy-tjahjono's solution.
I ended up not being able to get the value of uploadme from the scope. Even though uploadme in the HTML was visibly updated by the directive, I could still not access its value by $scope.uploadme. I was able to set its value from the scope, though. Mysterious, right..?
As it turned out, a child scope was created by the directive, and the child scope had its own uploadme.
The solution was to use an object rather than a primitive to hold the value of uploadme.
In the controller I have:
$scope.uploadme = {};
$scope.uploadme.src = "";
and in the HTML:
<input type="file" fileread="uploadme.src"/>
<input type="text" ng-model="uploadme.src"/>
There are no changes to the directive.
Now, it all works like expected. I can grab the value of uploadme.src from my controller using $scope.uploadme.
I create a directive and registered on bower.
This lib will help you modeling input file, not only return file data but also file dataurl or base 64.
{
"lastModified": 1438583972000,
"lastModifiedDate": "2015-08-03T06:39:32.000Z",
"name": "gitignore_global.txt",
"size": 236,
"type": "text/plain",
"data": "data:text/plain;base64,DQojaWdub3JlIHRodW1ibmFpbHMgY3JlYXRlZCBieSB3aW5kb3dz…xoDQoqLmJhaw0KKi5jYWNoZQ0KKi5pbGsNCioubG9nDQoqLmRsbA0KKi5saWINCiouc2JyDQo="
}
https://github.com/mistralworks/ng-file-model/
This is a slightly modified version that lets you specify the name of the attribute in the scope, just as you would do with ng-model, usage:
<myUpload key="file"></myUpload>
Directive:
.directive('myUpload', function() {
return {
link: function postLink(scope, element, attrs) {
element.find("input").bind("change", function(changeEvent) {
var reader = new FileReader();
reader.onload = function(loadEvent) {
scope.$apply(function() {
scope[attrs.key] = loadEvent.target.result;
});
}
if (typeof(changeEvent.target.files[0]) === 'object') {
reader.readAsDataURL(changeEvent.target.files[0]);
};
});
},
controller: 'FileUploadCtrl',
template:
'<span class="btn btn-success fileinput-button">' +
'<i class="glyphicon glyphicon-plus"></i>' +
'<span>Replace Image</span>' +
'<input type="file" accept="image/*" name="files[]" multiple="">' +
'</span>',
restrict: 'E'
};
});
For multiple files input using lodash or underscore:
.directive("fileread", [function () {
return {
scope: {
fileread: "="
},
link: function (scope, element, attributes) {
element.bind("change", function (changeEvent) {
return _.map(changeEvent.target.files, function(file){
scope.fileread = [];
var reader = new FileReader();
reader.onload = function (loadEvent) {
scope.$apply(function () {
scope.fileread.push(loadEvent.target.result);
});
}
reader.readAsDataURL(file);
});
});
}
}
}]);
function filesModelDirective(){
return {
controller: function($parse, $element, $attrs, $scope){
var exp = $parse($attrs.filesModel);
$element.on('change', function(){
exp.assign($scope, this.files[0]);
$scope.$apply();
});
}
};
}
app.directive('filesModel', filesModelDirective);
I had to do same on multiple input, so i updated #Endy Tjahjono method.
It returns an array containing all readed files.
.directive("fileread", function () {
return {
scope: {
fileread: "="
},
link: function (scope, element, attributes) {
element.bind("change", function (changeEvent) {
var readers = [] ,
files = changeEvent.target.files ,
datas = [] ;
for ( var i = 0 ; i < files.length ; i++ ) {
readers[ i ] = new FileReader();
readers[ i ].onload = function (loadEvent) {
datas.push( loadEvent.target.result );
if ( datas.length === files.length ){
scope.$apply(function () {
scope.fileread = datas;
});
}
}
readers[ i ].readAsDataURL( files[i] );
}
});
}
}
});
I had to modify Endy's directive so that I can get Last Modified, lastModifiedDate, name, size, type, and data as well as be able to get an array of files. For those of you that needed these extra features, here you go.
UPDATE:
I found a bug where if you select the file(s) and then go to select again but cancel instead, the files are never deselected like it appears. So I updated my code to fix that.
.directive("fileread", function () {
return {
scope: {
fileread: "="
},
link: function (scope, element, attributes) {
element.bind("change", function (changeEvent) {
var readers = [] ,
files = changeEvent.target.files ,
datas = [] ;
if(!files.length){
scope.$apply(function () {
scope.fileread = [];
});
return;
}
for ( var i = 0 ; i < files.length ; i++ ) {
readers[ i ] = new FileReader();
readers[ i ].index = i;
readers[ i ].onload = function (loadEvent) {
var index = loadEvent.target.index;
datas.push({
lastModified: files[index].lastModified,
lastModifiedDate: files[index].lastModifiedDate,
name: files[index].name,
size: files[index].size,
type: files[index].type,
data: loadEvent.target.result
});
if ( datas.length === files.length ){
scope.$apply(function () {
scope.fileread = datas;
});
}
};
readers[ i ].readAsDataURL( files[i] );
}
});
}
}
});
If you want something a little more elegant/integrated, you can use a decorator to extend the input directive with support for type=file. The main caveat to keep in mind is that this method will not work in IE9 since IE9 didn't implement the File API. Using JavaScript to upload binary data regardless of type via XHR is simply not possible natively in IE9 or earlier (use of ActiveXObject to access the local filesystem doesn't count as using ActiveX is just asking for security troubles).
This exact method also requires AngularJS 1.4.x or later, but you may be able to adapt this to use $provide.decorator rather than angular.Module.decorator - I wrote this gist to demonstrate how to do it while conforming to John Papa's AngularJS style guide:
(function() {
'use strict';
/**
* #ngdoc input
* #name input[file]
*
* #description
* Adds very basic support for ngModel to `input[type=file]` fields.
*
* Requires AngularJS 1.4.x or later. Does not support Internet Explorer 9 - the browser's
* implementation of `HTMLInputElement` must have a `files` property for file inputs.
*
* #param {string} ngModel
* Assignable AngularJS expression to data-bind to. The data-bound object will be an instance
* of {#link https://developer.mozilla.org/en-US/docs/Web/API/FileList `FileList`}.
* #param {string=} name Property name of the form under which the control is published.
* #param {string=} ngChange
* AngularJS expression to be executed when input changes due to user interaction with the
* input element.
*/
angular
.module('yourModuleNameHere')
.decorator('inputDirective', myInputFileDecorator);
myInputFileDecorator.$inject = ['$delegate', '$browser', '$sniffer', '$filter', '$parse'];
function myInputFileDecorator($delegate, $browser, $sniffer, $filter, $parse) {
var inputDirective = $delegate[0],
preLink = inputDirective.link.pre;
inputDirective.link.pre = function (scope, element, attr, ctrl) {
if (ctrl[0]) {
if (angular.lowercase(attr.type) === 'file') {
fileInputType(
scope, element, attr, ctrl[0], $sniffer, $browser, $filter, $parse);
} else {
preLink.apply(this, arguments);
}
}
};
return $delegate;
}
function fileInputType(scope, element, attr, ctrl, $sniffer, $browser, $filter, $parse) {
element.on('change', function (ev) {
if (angular.isDefined(element[0].files)) {
ctrl.$setViewValue(element[0].files, ev && ev.type);
}
})
ctrl.$isEmpty = function (value) {
return !value || value.length === 0;
};
}
})();
Why wasn't this done in the first place? AngularJS support is intended to reach only as far back as IE9. If you disagree with this decision and think they should have just put this in anyway, then jump the wagon to Angular 2+ because better modern support is literally why Angular 2 exists.
The issue is (as was mentioned before) that without the file api
support doing this properly is unfeasible for the core given our
baseline being IE9 and polyfilling this stuff is out of the question
for core.
Additionally trying to handle this input in a way that is not
cross-browser compatible only makes it harder for 3rd party solutions,
which now have to fight/disable/workaround the core solution.
...
I'm going to close this just as we closed #1236. Angular 2 is being
build to support modern browsers and with that file support will
easily available.
Alternatively you could get the input and set the onchange function:
<input type="file" id="myFileInput" />
document.getElementById("myFileInput").onchange = function (event) {
console.log(event.target.files);
};
Try this,this is working for me in angular JS
let fileToUpload = `${documentLocation}/${documentType}.pdf`;
let absoluteFilePath = path.resolve(__dirname, fileToUpload);
console.log(`Uploading document ${absoluteFilePath}`);
element.all(by.css("input[type='file']")).sendKeys(absoluteFilePath);