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General Tech Bugs & Fixes 2 years ago
Posted on 16 Aug 2022, this text provides information on Bugs & Fixes related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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Is it possible to have one controller use another?
For example:
This HTML document simply prints a message delivered by the MessageCtrl controller in the messageCtrl.js file.
MessageCtrl
messageCtrl.js
xmlns:ng="http://angularjs.org/"> charset="utf-8" /> </span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline; box-sizing: inherit; color: #303336;">Inter Controller Communication</span><span class="tag" style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline; box-sizing: inherit; color: #7d2727;"> <body> ng:controller="MessageCtrl"> {{message}}
The controller file contains the following code:
function MessageCtrl() { this.message = function() { return "The current date is: " + new Date().toString(); }; }
Which simply prints the current date;
If I were to add another controller, DateCtrl which handed the date in a specific format back to MessageCtrl, how would one go about doing this? The DI framework seems to be concerned with XmlHttpRequests and accessing services.
DateCtrl
XmlHttpRequests
There are multiple ways how to communicate between controllers.
The best one is probably sharing a service:
function FirstController(someDataService) { // use the data service, bind to template... // or call methods on someDataService to send a request to server } function SecondController(someDataService) { // has a reference to the same instance of the service // so if the service updates state for example, this controller knows about it }
Another way is emitting an event on scope:
function FirstController($scope) { $scope.$on('someEvent', function(event, args) {}); // another controller or even directive } function SecondController($scope) { $scope.$emit('someEvent', args); }
In both cases, you can communicate with any directive as well.
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