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* Initial widget tutorials extracted from https://btheado.github.io/tw-widget-tutorial/ * Fixes for refresh behavior change
19 lines
1.2 KiB
Plaintext
19 lines
1.2 KiB
Plaintext
created: 20190201232200698
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modified: 20190216175629825
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tags:
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title: Hello World widget tutorial
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type: text/vnd.tiddlywiki
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Now let's create a widget which actually has output.
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When tiddlywiki encounters a widget definition like `<$hello>` it will create an object which is an instance of the class which is exported by the widget code.
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In addition to creating an instance of the class, tiddlywiki will call the render method of the resulting object. The render method is expected to create a dom node which will be display in place of the widget.
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In the `donothing` example the core widget was exported. The core widget class doesn't have a render method which creates a dom node and that's why there is no output. Getting output requires writing a widget class which inherits from the core `Widget` class. Code in the render method of this class will display the hello world message.
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The [[hello.js]] tiddler has code which accomplishes that:
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{{hello.js}}
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The code for importing the core widget class remains, but now we also have code to create our own class which inherits from it. In addition an implementation of the `render` method is included. Here is the result:
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{{Hello World demo}}
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