In this case we are declaring a string parameter:. Note that all the documentation for an attribute needs to go next to the attribute definition, even when you need special documentation about how set performs for that widget. For example:. Actually, most of the time, the mapping happens automatically. Standard DOMNode attributes like tabindex, alt, aria-labelledby, etc.
Set and get will automatically detect and call these custom setters. Custom setters are quite common. Note in the above example the use of this. The custom setters specified above both functions and mappings to DOMNodes are applied at widget creation time for every attribute either specified to the widget constructor, or with a non-null non-blank non-zero default value. Note that the application happens after buildRendering but before postCreate , so you need to make sure that none of that code is dependent on something that happens in postCreate , or later.
Had the multiplier member been defined in postCreate , the initial automated value setting done by set would fail. Often a widget declared in markup will have contents, i. The attach point where that input is copied is called containerNode.
In other words, if you check myButton. Having said all that, now we define the widget, referencing this template via the templateString attribute. Note that often the template is stored in a file, and in that case templateString should reference the file via the dojo.
What you want is for the programmer using the widget to be able to either change what happens, or have something happen in addition, without having to edit your widget. Note that we need to distinguish between DOM events, which happen on DOM elements; and widget events, which fire when things happen in the widget. The onclick refers to the DOM event on this div. Now it is time to create our Worker widget. For now, this widget will only render static content. We will use its properties to allow the application to customize what is rendered.
Our goal is to end up with something that looks like this:. The first step is to create the worker widget. We will put the implementation in Worker. As with the App widget that we created earlier, we need to add some initial dependencies and the class declaration to Worker. This is nearly identical to the App widget with one exception: we are not importing the w function as the Worker widget will not contain any child widgets.
To accomplish this, we are going to need two children. We have succeeded in rendering the widget, but there seem to be some styling issues. In Dojo, this is done by creating an interface to pass configuration information into the widget.
This is done via a destructuring assignment. We can now update the generated virtual DOM with those values by updating the returned value from the render method with those property values. You should already see the new values. To use the functionality of the new Worker widget we will update the render method in the App class to pass in some properties.
Dojo leverages CSS Modules to provide all of the flexibility of CSS, but with the additional benefit of localized styling rules to help prevent inadvertent rule collisions. To allow our Worker widget to be styled, we need to modify the class. Also, we will apply a theme mixin to the Worker widget. A mixin is not intended to be used on its own, but instead works with a class to add useful functionality. You may notice that we are calling this.
To learn more about theming, review the Theming an Application tutorial. The dojo build command uses CSS Modules to obfuscate class names when it compiles the project to ensure that CSS selectors are localized to a given widget. To learn more about those, take a look at the Theming an Application tutorial. We could certainly add additional Worker widgets to our application, but they would all be siblings of the Banner widget and could be difficult to style properly.
The WorkerContainer manages the layout of our Worker widgets and makes it easier to style these widgets. The WorkerContainer has many of the same responsibilities as the App widget. It will be responsible for generating both virtual DOM nodes directly as well as rendering widgets.
Similar to the Worker widget, we will apply some styling to it. Notice that we have added a key property to each child. This is needed so that we can differentiate between the children. Introduction Dojo encourages writing simple, modular components known as widgets which implement single responsibilities out of the wider requirements of an application.
Feature Description Reactive by design Dojo widgets are designed around core reactive principles to ensure predictable, consistent behavior as state changes propagate through an application. Encapsulated widgets Create independent, encapsulated widgets that can be wired together in a variety of configurations to create complex and beautiful user interfaces.
DOM abstractions The framework provides suitable reactive abstractions that mean Dojo applications do not need to interact directly with an imperative DOM. Efficient rendering Dojo's rendering system can detect state changes within specific subtrees of a widget hierarchy, allowing efficient re-rendering of only the affected portions of an application when an update occurs.
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