I have to implement virtualization and inifnite scroll with Material-Table, while preserving all its capabilities, such as selection, draggable columns, styling etc.
I was following this example: https://codesandbox.io/s/virtualized-material-table-28umv. However, it seems to fail when selection comes in to play.
Does anybody have any working example for that?
I think you simply forgot to pass the onClick handler to the TableBody onRowClick prop. So creating a handler and then passing it in line #108
onRowClick={onRowClick}
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I have the following issue:
I would like to create a simple choropleth map using react-leaflet's GeoJSON component. I also want to have a tooltip that shows a value on hover over a GeoJSON feature. The problem is performance. A CodePen example can be found here: https://codepen.io/timester-the-typescripter/pen/gOXGKOY
I attach event handlers to each GeoJSON feature and set a state variable in my "main" component that holds the value for the currently hovered area.
const [selected, setSelected] = React.useState(null);
My tooltip relies on that state variable to show its value. Because every mouse hover event causes main component state change, the GeoJSON component gets re-rendered all the time. This is not a huge problem in the CodePen example, but for a full world map it is unfortunately.
I assume that the state change causes this because if I comment out the 2 setSelected lines (line 55, and line 67 in CodePen), the re-renders (calls to createGeoJSON ) stop, and the event handlers run a lot faster as the profiler pictures show below.
Mouseout event with state change:
Mouseout event with state change commented out:
I tried many solutions with no success. For example I think I can't memoize the GeoJSON component because the Tooltip must be its child and that depends on the state of the main component.
In the future I want to add more components depending on the hovered state variable like a legend, etc.. and maybe that variable will be a bit more complex than a simple number too.
What options do I have here? I had another stackowerflow question about this, but then I did not understand the problem completely, so it was not super focused. I'm at the point where I'm thinking about rewriting it in Angular. I found react and react-leaflet very pleasant to work with, until this issue came up.
The problem is that currently you are recreating the map with the appropriate Tooltip on each mouseover via the state. Instead, you should bind all Tooltips at map creation with layer.bindTooltip(). This will allow you to just show/hide them without having to recreate the map again, since they are already created and their creation will not rely on state.
See this github issue for an example with Popups (but the logic for Tooltips should be the same): https://github.com/PaulLeCam/react-leaflet/issues/33
I got help from this reddit comment https://www.reddit.com/r/reactjs/comments/std46f/comment/hx3yq34/?utm_source=share&utm_medium=web2x&context=3
The solution I applied based on this is not to use the Tooltip as a child component, but bind a tooltip to each layer in the onEachFeature method.
const onEachFeature = useCallback((feature, layer) => {
layer.bindTooltip(feature.properties.COUNT, {sticky: true});
...
This way I could also wrap the GeoJSON component in a useMemo() as there were no longer dependencies on the selected state. I also wrapped the style and onEachFeature functions in useCallback().
This combination solved the issue!
Using material-ui/lab 4.0.0-alpha.27 - TreeView Component
I have a treeview with a couple of hundred nodes. I have added a textfield before the treview that the user can use to search/filter the tree. As they type I add/remove classes from the TreeItems to hide and show TreeItems. It works fine BUT we want all of the nodes to be expanded once they enter something into the search/filter textfield.
I have tried feeding the "defaultExpanded" prop a new list that has all of the nodes in it but it doesn't seem to cause the nodes to expand as I had expected. The defaultExpanded prop only seems to be respected when the tree initially draws.
I am currently working around this by looking for collapsed nodes and firing click events for them to force them to open but that is causing issues (the textfield looses focus and the keyboard hides and the treeview jumps around). I need something a bit smoother.
You need to use the expanded prop, instead of defaultExpanded.
I'm trying to figure out how to work around what appears to be greedy-focus issues with react-select.
I'm using custom components in my MenuList component that need the focus to work (rc-slider). Basically, I'd like the select to support an additional value for each option and I'm using a Slider to do that.
The issue with the sliders is that I can click on them to change the value, but can't drag the handles, as the Select seems to take back the focus (and even close the drop-down if menuIsOpen is not controlled).
The select does need to re-render when the values change, but I can't figure out why the focus has to change.
https://codesandbox.io/s/epic-moon-cv33b
I've added ScaleImageLabel to swipe Tabs. I want to calculate amount of time each tab remains in focus. I added focus listener to Tabs/ScaleImageLabel but it's not getting fired. It's working when added to the form. Any suggestions on how to achieve it?
If I understand correctly what you need is a tab selection listener. Focus listener will only work for focusable components and labels are by default non-focusable. I would recommend avoiding it since focus is used for key based navigation. It might produce different results than you would expect.
I've managed to render a react-virtulized List to which I passed an array of react-bootstrap Panels. I've measured each of my rows, and via children callback, each time one of the child panels are clicked, an attribute in the parent state is updated. Said attribute is used inside the react-virtualized List rowHeight() function top check whether that panel is currently expanded. Then, using a ref to my List, i call the recomputeRowHeights(index) and forceUpdateGrid() methods on saidref.
The thing is, while the List component correctly updates both the height and position of my rows, the animation isn't smooth. I mean, the bootstrap expand animation works fine, but the change in height of the expanded row happens instantly after the click event, and then the animation starts, feeling somewhat chopy.
Is there any workaround for this, or is this an upcoming/planned/in the works feature for react-virtualized?
Unfortunately, I have not spent much time working with or optimizing for resize animations within react-virtualized. It doesn't surprise me to hear that the resize/reposition is a bit choppy in the case you mention.
Here's a quick-and-dirty example of one way you may add animation: plnkr.co/edit/VanCAQmSkUejp3hbJUyJ?p=preview. Not meant to be bug free, just an illustration. :D