Håkon Nordli
Jan 8, 2016
  4687
(0 votes)

Dojo - How to keep the widget's scope

When binding an event in JavaScript the scope outside the binding is not the same as inside. Which means that "this" is not the same outside as inside the binding.

Below there is a JavaScript example, which console.logs two different "this". The first console.log prints the object Foo, the second console.log prints the button object.

 

image

 

However, sometimes we want to keep the scope. This is often solved by putting "this" in a variable, like the example below. This way both console.logs prints the Foo object.

 

image

 

In Dojo there is a built-in function, hitch, which can keep the scope. This can come in handy when developing Dijit widgets.

In the example below hitch forces the on method to retain the original scope. In this way we keep "this" inside the callback, and we do not need to create a variable for "this" like we did above.

 

image

Jan 08, 2016

Comments

Please login to comment.
Latest blogs
Translating Optimizely CMS 12 UI components

Optimizely CMS 12 have been out for a while now, but still some elements haven't been properly translated resulting in a GUI defaulting to english....

Eric Herlitz | Jan 26, 2023 | Syndicated blog

Image preview in Optimizely CMS12 all properties view

With these simple steps, you can now see an Image and its Metadata, including size and dimensions, when editing an Image property in Optimizely...

Tomas Hensrud Gulla | Jan 26, 2023 | Syndicated blog

Setting up the ImageEditor in Optimizely CMS 12

Setting up certain configurations on Opimizely CMS 12 differs quite a bit from prior versions of (Episerver CMS 11 and older). Here's a small guide...

Eric Herlitz | Jan 25, 2023 | Syndicated blog

Happy Hour Returning in February

Hi everyone! It's been a while and we're excited to resume our Happy Hour in February for more learning, sharing, connecting, relaxing, and just to...

Patrick Lam | Jan 24, 2023

Planned breaking change for Locale parameter in Content Graph

Content Graph, a new service which makes it possible to query content using GraphQL, will have a breaking change soon. The service is currently in...

Jonas Bergqvist | Jan 23, 2023

Optimizely Advanced ContentArea Render is Back!

If you have used EPiBootstrapArea package - then back in those days we had an opportunity to render Episerver ContentArea items with different...

valdis | Jan 23, 2023 | Syndicated blog