How to Wait For A Global/Event Outside Of Ember.js?

In some cases, you may need to wait for a global event or external dependency to be resolved before proceeding with your Ember.js application. One approach to handling this situation is to use promises or callbacks to wait for the event to occur.

You can create a promise or callback function that listens for the global event or external dependency to be resolved. This function can then be called within your Ember.js application to wait for the event to complete before continuing with the necessary actions.

Alternatively, you can use the setTimeout function to periodically check for the status of the global event or external dependency. By setting a timeout and repeatedly checking for the event, you can wait for it to be resolved before proceeding with your Ember.js application.

Overall, the key is to implement a mechanism that allows your Ember.js application to wait for the global event or external dependency to be resolved before continuing with the necessary actions. This can be achieved through the use of promises, callbacks, or periodic checks using the setTimeout function.

How to prevent default behavior on events in ember.js?

To prevent the default behavior on events in Ember.js, you can use the event.preventDefault() method in the event handler function. Here is an example of how you can prevent the default behavior of a click event on a button in Ember.js:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11

import Component from '@glimmer/component';
import { action } from '@ember/object';

export default class MyComponent extends Component {
  @action
  handleClick(event) {
    event.preventDefault();
    
    // Your custom logic here
  }
}

In this example, the handleClick action is called when the button is clicked. By calling event.preventDefault(), the default behavior of the click event (such as submitting a form or following a link) is prevented, allowing you to handle the event as needed within your Ember.js application.

What is the recommended approach for handling global events in ember.js?

In Ember.js, the recommended approach for handling global events is to use event handling methods provided by Ember.js itself, such as the Ember.Evented mixin and the send method. This allows you to define global event handlers in your application's routes, controllers, or components and then emit or trigger these events from anywhere in your application.

Here is an example of how you can handle global events in Ember.js using the Ember.Evented mixin:

1. Add the Ember.Evented mixin to any object you want to handle events in, such as a route, controller, or component:

1
2
3
4
5

import Ember from 'ember';

export default Ember.Route.extend(Ember.Evented, {
  // Your route code here
});

1. Define event handlers for the object, such as in the actions property of a route or controller:

1
2
3
4
5
6
7
8
9

import Ember from 'ember';

export default Ember.Route.extend(Ember.Evented, {
  actions: {
    handleGlobalEvent() {
      // Handle the global event here
    }
  }
});

1. Emit or trigger the global event from any other part of your application using the send method:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10

import Ember from 'ember';

export default Ember.Component.extend({
  globalEventEmitter: Ember.inject.service('global-event-emitter'),
  
  // Emit the global event
  triggerGlobalEvent() {
    this.get('globalEventEmitter').trigger('globalEvent');
  }
});

By following this approach, you can easily define and handle global events in your Ember.js application in a clean and organized manner.

How to pass arguments to event handlers in ember.js?

In Ember.js, you can pass arguments to event handlers using the {{action}} helper in your template. Here's how you can do it:

1. Define the action in your template with the {{action}} helper and pass the arguments you want to send to the event handler:

1

<button {{action "handleClick" "arg1" "arg2"}}>Click me</button>

1. Define the event handler in your component or controller:

1
2
3
4
5
6

actions: {
  handleClick(arg1, arg2) {
    // do something with the arguments
    console.log(arg1, arg2);
  }
}

Now when the button is clicked, the handleClick action will be triggered with the arguments "arg1" and "arg2". You can pass as many arguments as needed by adding them to the {{action}} helper in the template and defining them in the event handler in the component or controller.

How to delegate events in ember.js?

In Ember.js, you can delegate events by using the @on modifier in the template or by directly specifying the event handler in the component's JavaScript file.

1. Using the @on modifier in a template:

In your template, you can use the @on modifier to delegate events to a specific event handler in the component. Here's an example of how you can delegate a click event to a handleClick event handler in a component:

1

<button {{on "click" this.handleClick}}>Click me</button>

In this example, when the button is clicked, the handleClick event handler in the component will be called.

1. Directly specifying event handlers in a component's JavaScript file:

You can also directly specify event handlers in the component's JavaScript file. Here's an example of how you can delegate a click event to a handleClick event handler in a component:

1
2
3
4
5
6
7
8
9

import Component from '@glimmer/component';
import { action } from '@ember/object';

export default class MyComponent extends Component {
  @action
  handleClick() {
    console.log('Button clicked!');
  }
}

In this example, the handleClick event handler is defined using the @action decorator. You can then use this event handler in the template by referencing it using the this keyword:

1

<button {{on "click" this.handleClick}}>Click me</button>

By using either of these methods, you can delegate events in Ember.js components and handle them in the specified event handlers.

How to handle click events in ember.js?

In Ember.js, you can handle click events by using the {{action}} helper in your templates or by using the {{on}} modifier.

1. Using the {{action}} helper: You can add the {{action}} helper to an HTML element in your template, passing in the name of the action you want to trigger on the click event. For example:

1

<button {{action "handleClick"}}>Click me</button>

In your corresponding component or controller file, define the handleClick action:

1
2
3
4
5

actions: {
  handleClick() {
    // Handle click event logic here
  }
}

1. Using the {{on}} modifier: You can use the {{on}} modifier to attach event listeners to HTML elements in your templates. For example:

1

<button {{on "click" this.handleClick}}>Click me</button>

In your corresponding component or controller file, define the handleClick action:

1
2
3

handleClick() {
  // Handle click event logic here
}

Both of these methods allow you to handle click events in Ember.js and execute the associated logic when the event is triggered.