I've made a directive that display an Open Layers map (below is not my production code, but a simplified version used to create a plunkr. Don't pay attention to the hardcoded DOM element ID).
EDIT : the hardcoded ID was indeed the issue, see comments below...
app.directive('tchOlMapCopy', function () {
return {
restrict: 'E',
replace: true,
template: '<div id="tchMap" class="full-height"></div>',
link: function postLink(scope, element, attrs) {
var map = new OpenLayers.Map("tchMap");
map.addLayer(new OpenLayers.Layer.OSM());
map.setCenter(new OpenLayers.LonLat(3, 47).transform(new OpenLayers.Projection("EPSG:4326"), new OpenLayers.Projection("EPSG:900913")), 5);
}
}
I had that issue that, when I change route in my app an go from one screen including that directive to another, the map won't display on the second screen. The link function in the directive isn't even called.
I've narrowed down the issue to be related to ngAnimate module. If I remove dependency to this module, the map will display correctly on second route change.
I've made a Plunkr to illustrate this issue. Comment or uncomment the ngAnimate module in app.js file to see the issue.
Does anybody have an idea why ngAnimate breaks my directive call ?
Having multiple instance of this directive which has an hardcoded id seems a very bad idea. Should be a unique identifier : http://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes#id
I'm a 2 week old Angular noob, and I've been attempting my first ever directive for over a day now. :P I've read this and this, which seem good directives introductions and a bunch of Stackoverflow answers, but I can't get this working.
<div ng-app="App" ng-controller="Main">
<textarea caret caret-position="uiState.caretPosition"></textarea>
{{uiState.caretPosition}}
</div>
and
angular.module('App', [])
.controller('Main', ['$scope', function ($scope) {
$scope.uiState = {};
$scope.uiState.caretPosition = 0;
}])
.directive('caret', function() {
return {
restrict: 'A',
scope: {caretPosition: '='},
link: function(scope, element, attrs) {
var $el = angular.element(element);
$el.on('keyup', function() {
scope.caretPosition = $el.caret();
});
}
};
});
Fiddle is here. I'm basically trying to get the caret position within a textbox. I'm using this jQuery plugin in the fiddle (source of the .caret() method, which should just return a number).
My questions are
Do I even need a directive here? Ben Nadel says the best directives are the ones you don't have to write (amen to that!)
If yes, is this the right way to go about the directive? Ie isolated scope with two-way bound variable?
If yes, when I run this code locally, I keep getting the error Expression 'undefined' used with directive 'caret' is non-assignable!. I've read the doc and as far as I can tell I've followed instructions for how to fix to no avail.
BONUS: Why in jsfiddle do I get no such error. The fiddle just fails silently. What's with that?
Thanks!
My solution was harder to find out here, but easier to implement. I had to change it to the equivalent of;
scope: {caretPosition: '=?'},
(Note that the question mark makes the attribute optional. Prior to 1.5 this apparently wasn't required.)
You were close.. The main problem is changing a scope variable inside an event that angular doesn't know about. When that event occurs, you have to tell angular that something changed by using scope.$apply.
$el.on('keyup', function() {
scope.$apply( function() {
scope.caretPosition = $el.caret();
});
});
Working fiddle here
For the questions:
yes, I don't think there's a way around having to write a directive for this.
in this case, it seems fine.
not sure, there are no problems in the jsfiddle. It sounds like you're setting carat="something" somewhere? check to make sure the html is the same as what's in the fiddle.
same as 3
Also note that if you click and move the caret, it won't update because it's only listening for keyup.
As per the title, when I use templateUrl inside of my $routeProvider, the template and controller do not load.
In my config, I have:
.when('/thing/:thingId', {
templateUrl: 'views/things.html',
controller: 'ThingController'
})
If I change that to
.when('/thing/:thingId', {
template: '<div>Hello you!</div>',
controller: 'ThingController'
})
It works. I'm using AngularJS 1.2.2.
Ideas I've tried:
I've tried adding the template to a script tag which still doesn't work. I get no errors and, since it's on IE, no debug messages. I've got an alert that fires the moment my controller is instantiated. This doesn't happen in IE 7 (and probably 8).
Added html5shiv, json3 shim, angular-ui's ie shiv, and I've created all the common document elements.
I've got the following at the top of my site:
<html class="ng-app:ThingApp" ng-app="ThingApp" id="ng-app" xmlns:ng="http://angularjs.org">
Each idea I've tried works in Chrome and IE10 emulating IE7 (the entire thing works in IE10 emulating IE7, just not real IE7).
I'll try to put up an example to demonstrate the problem but wanted to pose the question first.
EDIT In hindsight I've realized a plunkr example is silly because plunkr doesn't run in IE7 and this code works in things that DO run plunkr. Anyway, I created it so that code can be viewed.
http://plnkr.co/edit/Yswo2QzcwfpzT2PXJV8m
For Angular versions 1.2+, you will need to inject $sce and wrap your resourceUrl with $sce.trustAsResourceUrl('...') for IE7 and below, giving you the following in your directive:
...
templateUrl: $sce.trustAsResourceUrl('/Resource/That/YouTrust.html')
...
reference
you may also need to monkey patch document.querySelector by doing something like the following (if you are using jQuery):
if (!document.querySelector)
{
document.querySelector = function (selector)
{
return $(selector).get(0);
};
}
otherwise angular will blow up here (from Angular source):
var active = !!(document.querySelector('[ng-csp]') ||
document.querySelector('[data-ng-csp]'));
also ensure you are following the Angular IE Compatibility Reference, specifically adding id="ng-app" and not using element directives.
Do all of this and IE7 might work ;)
Edit: fixing the reference URL
It appears that AngularJS from 1.2 onward, does not support IE7. Fixed this issue by switching to AngularJS 1.1.5.
I understand AngularJS runs through some code twice, sometimes even more, like $watch events, constantly checking model states etc.
However my code:
function MyController($scope, User, local) {
var $scope.User = local.get(); // Get locally save user data
User.get({ id: $scope.User._id.$oid }, function(user) {
$scope.User = new User(user);
local.save($scope.User);
});
//...
Is executed twice, inserting 2 records into my DB. I'm clearly still learning as I've been banging my head against this for ages!
The app router specified navigation to MyController like so:
$routeProvider.when('/',
{ templateUrl: 'pages/home.html',
controller: MyController });
But I also had this in home.html:
<div data-ng-controller="MyController">
This digested the controller twice. Removing the data-ng-controller attribute from the HTML resolved the issue. Alternatively, the controller: property could have been removed from the routing directive.
This problem also appears when using tabbed navigation. For example, app.js might contain:
.state('tab.reports', {
url: '/reports',
views: {
'tab-reports': {
templateUrl: 'templates/tab-reports.html',
controller: 'ReportsCtrl'
}
}
})
The corresponding reports tab HTML might resemble:
<ion-view view-title="Reports">
<ion-content ng-controller="ReportsCtrl">
This will also result in running the controller twice.
AngularJS docs - ngController
Note that you can also attach controllers to the DOM by declaring it
in a route definition via the $route service. A common mistake is to
declare the controller again using ng-controller in the template
itself. This will cause the controller to be attached and executed
twice.
When you use ngRoute with the ng-view directive, the controller gets attached to that dom element by default (or ui-view if you use ui-router). So you will not need to attach it again in the template.
I just went through this, but the issue was different from the accepted answer. I'm really leaving this here for my future self, to include the steps I went through to fix it.
Remove redundant controller declarations
Check trailing slashes in routes
Check for ng-ifs
Check for any unnecessary wrapping ng-view calls (I accidentally had left in an ng-view that was wrapping my actual ng-view. This resulted in three calls to my controllers.)
If you are on Rails, you should remove the turbolinks gem from your application.js file. I wasted a whole day to discover that. Found answer here.
Initializing the app twice with ng-app and with bootstrap. Combating AngularJS executing controller twice
When using $compile on whole element in 'link'-function of directive that also has its own controller defined and uses callbacks of this controller in template via ng-click etc. Found answer here.
Just want to add one more case when controller can init twice (this is actual for angular.js 1.3.1):
<div ng-if="loading">Loading...</div>
<div ng-if="!loading">
<div ng-view></div>
</div>
In this case $route.current will be already set when ng-view will init. That cause double initialization.
To fix it just change ng-if to ng-show/ng-hide and all will work well.
Would like to add for reference:
Double controller code execution can also be caused by referencing the controller in a directive that also runs on the page.
e.g.
return {
restrict: 'A',
controller: 'myController',
link: function ($scope) { ....
When you also have ng-controller="myController" in your HTML
When using angular-ui-router with Angular 1.3+, there was an issue about Rendering views twice on route transition. This resulted in executing controllers twice, too. None of the proposed solutions worked for me.
However, updating angular-ui-router from 0.2.11 to 0.2.13 solved problem for me.
I tore my app and all its dependencies to bits over this issue (details here: AngularJS app initiating twice (tried the usual solutions..))
And in the end, it was all Batarang Chrome plugin's fault.
Resolution in this answer:
I'd strongly recommend the first thing on anyone's list is to disable it per the post before altering code.
If you know your controller is unintentionally executing more than once, try a search through your files for the name of the offending controller, ex: search: MyController through all files. Likely it got copy-pasted in some other html/js file and you forgot to change it when you got to developing or using those partials/controllers. Source: I made this mistake
I had the same problem, in a simple app (with no routing and a simple ng-controller reference) and my controller's constructor did run twice. Finally, I found out that my problem was the following declaration to auto-bootstrap my AngularJS application in my Razor view
<html ng-app="mTest1">
I have also manually bootstrapped it using angular.bootstrap i.e.
angular.bootstrap(document, [this.app.name]);
so removing one of them, it worked for me.
In some cases your directive runs twice when you simply not correct close you directive like this:
<my-directive>Some content<my-directive>
This will run your directive twice.
Also there is another often case when your directive runs twice:
make sure you are not including your directive in your index.html TWICE!
Been scratching my head over this problem with AngularJS 1.4 rc build, then realised none of the above answers was applicable since it was originated from the new router library for Angular 1.4 and Angular 2 at the time of this writing. Therefore, I am dropping a note here for anyone who might be using the new Angular route library.
Basically if a html page contains a ng-viewport directive for loading parts of your app, by clicking on a hyperlink specified in with ng-link would cause the target controller of the associated component to be loaded twice. The subtle difference is that, if the browser has already loaded the target controller, by re-clicking the same hyperlink would only invoke the controller once.
Haven't found a viable workaround yet, though I believe this behaviour is consistent with the observation raised by shaunxu, and hopefully this issue would be resolved in the future build of new route library and along with AngularJS 1.4 releases.
In my case, I found two views using the same controller.
$stateProvider.state('app', {
url: '',
views: {
"viewOne#app": {
controller: 'CtrlOne as CtrlOne',
templateUrl: 'main/one.tpl.html'
},
"viewTwo#app": {
controller: 'CtrlOne as CtrlOne',
templateUrl: 'main/two.tpl.html'
}
}
});
The problem I am encountering might be tangential, but since googling brought me to this question, this might be appropriate. The problem rears its ugly head for me when using UI Router, but only when I attempt to refresh the page with the browser refresh button. The app uses UI Router with a parent abstract state, and then child states off the parent. On the app run() function, there is a $state.go('...child-state...') command. The parent state uses a resolve, and at first I thought perhaps a child controller is executing twice.
Everything is fine before the URL has had the hash appended.
www.someoldwebaddress.org
Then once the url has been modified by UI Router,
www.someoldwebaddress.org#/childstate
...and then when I refresh the page with the browser refresh button, the $stateChangeStart fires twice, and each time points to the childstate.
The resolve on the parent state is what is firing twice.
Perhaps this is a kludge; regardless, this does appear to eliminate the problem for me: in the area of code where $stateProvider is first invoked, first check to see if the window.location.hash is an empty string. If it is, all is good; if it is not, then set the window.location.hash to an empty string. Then it seems the $state only tries to go somewhere once rather than twice.
Also, if you do not want to rely on the app's default run and state.go(...), you can try to capture the hash value and use the hash value to determine the child state you were on just before page refresh, and add a condition to the area in your code where you set the state.go(...).
For those using the ControllerAs syntax, just declare the controller label in the $routeprovider as follows:
$routeprovider
.when('/link', {
templateUrl: 'templateUrl',
controller: 'UploadsController as ctrl'
})
or
$routeprovider
.when('/link', {
templateUrl: 'templateUrl',
controller: 'UploadsController'
controllerAs: 'ctrl'
})
After declaring the $routeprovider, do not supply the controller as in the view. Instead use the label in the view.
In my case it was because of the url pattern I used
my url was like /ui/project/:parameter1/:parameter2.
I didn't need paramerter2 in all cases of state change. In cases where I didn't need the second parameter my url would be like /ui/project/:parameter1/. And so whenever I had a state change I will have my controller refreshed twice.
The solution was to set parameter2 as empty string and do the state change.
I've had this double initialisation happen for a different reason. For some route-transitions in my application I wanted to force scrolling to near the top of the page (e.g. in paginated search results... clicking next should take you to the top of page 2).
I did this by adding a listener to the $rootScope $on $viewContentLoaded which (based on certain conditions) executed
$location.hash('top');
Inadvertently this was causing my routes to be reevaluated and the controllers to be reinitialised
My issue was updating the search parameters like so $location.search('param', key);
you can read more about it here
controller getting called twice due to append params in url
In my case renaming the controller to a different name solved the problem.
There was a conflict of controller names with "angular-ui-tree" module: I renamed my controller from "CatalogerTreeController" to "TreeController" and then this controller starts to be initiated twice on the page where "ui-tree" directive used because this directive uses controller named "TreeController".
I had the same problem and after trying all the answers I finally found that i had a directive in my view that was bound to the same controller.
APP.directive('MyDirective', function() {
return {
restrict: 'AE',
scope: {},
templateUrl: '../views/quiz.html',
controller: 'ShowClassController'
}
});
After removing the directive the controller stopped being called twice. Now my question is, how can use this directive bound to the controller scope without this problem?
I just solved mine, which was actually quite disappointing. Its a ionic hybrid app, I've used ui-router v0.2.13. In my case there is a epub reader (using epub.js) which was continuously reporting "no document found" once I navigate to my books library and select any other book. When I reloaded the browser book was being rendered perfectly but when I selected another book got the same problem again.
My solve was very simple. I just removed reload:true from $state.go("app.reader", { fileName: fn, reload: true }); in my LibraryController
I have the same issue in angular-route#1.6.7, and it because the extra slash in the end of regex route:
.when('/goods/publish/:classId/', option)
to
.when('/goods/publish/:classId', option)
and it works correctly.
Just adding my case here as well:
I was using angular-ui-router with $state.go('new_state', {foo: "foo#bar"})
Once I added encodeURIComponent to the parameter, the problem was gone: $state.go('new_state', {foo: encodeURIComponent("foo#bar")}).
What happened?
The character "#" in the parameter value is not allowed in URLs. As a consequence, angular-ui-router created my controller twice: during first creation it passed the original "foo#bar", during second creation it would pass the encoded version "foo%40bar". Once I explicitly encoded the parameter as shown above, the problem went away.
My issue was really difficult to track down. In the end, the problem was occurring when the web page had missing images. The src was missing a Url. This was happening on an MVC 5 Web Controller. To fix the issue, I included transparent images when no real image is available.
<img alt="" class="logo" src="">
I figured out mine is getting called twice is because i was calling the method twice from my html.
`<form class="form-horizontal" name="x" ng-submit="findX() novalidate >
<input type="text"....>
<input type="text"....>
<input type="text"....>
<button type="submit" class="btn btn-sm btn-primary" ng-click="findX()"
</form>`
The highlighted section was causing findX() to be called twice. Hope it helps someone.