added an example showing bidirectional binding between python/react for complex objects #9
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…or complex objects
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Nice example!
I am wondering:
When I use the first example and type
w.simple_dict["foo"] = 3000
into the next cell, it does not directly update the table, only after pressing the button the next time the value 3000 occurs.
However, when I type
w.simple_dict = {'foo':99, 'bar':99, 'baz':99}
in the next cell, all values are updated immediately without pressing the button again.
Why is that not the case?
| "\n", | ||
| " @observe('count')\n", | ||
| " def _observe_count(self, change):\n", | ||
| " new_val = self.count\n", |
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| " new_val = self.count\n", |
unused variable
| "\n", | ||
| " @observe('count')\n", | ||
| " def _observe_count(self, change):\n", | ||
| " new_val = self.count\n", |
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| " new_val = self.count\n", |
|
and one more observation: bar does not update to 3000 as well when I press the |
|
Note that trailets doesn’t detect mutations of objects, only assignment.
This reflect the Python language. Not something we can change I think.
On Fri, 28 Apr 2023 at 12:01, Jan-Hendrik Müller ***@***.***> wrote:
and one more observation:
when I change the parameter bar in the second example
z = UpdateDictFromReactWidget()
z.simple_dict["bar"] = 3000
bar does not update to 3000 as well when I press the increment bar button.
bar only gets the new value after pressing the times confetti button.
As before,
z.simple_dict = {'foo':2, 'bar':2, 'baz':2} updates everything
immediately.
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|
Co-authored-by: Jan-Hendrik Müller <[email protected]>
Co-authored-by: Jan-Hendrik Müller <[email protected]>
| "outputs": [], | ||
| "source": [ | ||
| "class UpdateDictFromPythonWidget(ipyreact.ReactWidget):\n", | ||
| " #note that when we add these traitlets, they will automatically be made available to the react component\n", |
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| " #note that when we add these traitlets, they will automatically be made available to the react component\n", | |
| " #note that when we add these traits with sync=True, they will automatically be made available to the react component\n", |
| " @observe('count')\n", | ||
| " def _observe_count(self, change):\n", | ||
| " new_val = self.count\n", | ||
| " sd = self.simple_dict.copy()\n", |
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Maybe add a note saying that traitlets cannot detect mutations to a dict, and therefore we need to make a copy.
| " export const DictUpdate = ({fullDict, set_fullDict}) => {\n", | ||
| " return (<button onClick={() => {\n", | ||
| " console.log('dict update')\n", | ||
| " const newVal = {...fullDict};\n", |
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Also could use a comment here that we do a (shallow) copy so we don't mutate the original object, otherwise changes detection would go unnoticed.
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bi-directional binding between jupyter and python works... as long as you replace the entire object from both sides. As is react best practice.