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set default value on picker when data has only 1 element #11819

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merged 4 commits into from
Nov 2, 2022
Merged

set default value on picker when data has only 1 element #11819

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be1b787
set default value on picker when data has only 1 element
aimane-chnaif Oct 13, 2022
4602ce2
add comment of setting default value on picker
aimane-chnaif Oct 14, 2022
4b9978a
add comment of setting default value on picker
aimane-chnaif Oct 14, 2022
5029369
update comment on BasePicker
aimane-chnaif Oct 18, 2022
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20 changes: 20 additions & 0 deletions src/components/Picker/BasePicker/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,26 @@ class BasePicker extends React.Component {
this.executeOnCloseAndOnBlur = this.executeOnCloseAndOnBlur.bind(this);
}

componentDidMount() {
this.setDefaultValue();
}

componentDidUpdate(prevProps) {
if (prevProps.items === this.props.items) {
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Is this equality check OK or should it use something a little better like _.isEqual()?

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I don't think we need deep comparison here to improve performance.
Because once value is set, don't set again anymore from this code:
if (this.props.value || !this.props.items || this.props.items.length !== 1 || !this.props.onInputChange) {
return;
}

If we use _.isEqual(), it calculates every time this component is rendered (i.e. when value changed), so it affects performance.

return;
}
this.setDefaultValue();
}

setDefaultValue() {
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@sobitneupane sobitneupane Oct 14, 2022 •
edited
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We only set Default Value if number of items is one. So, can you please add a comment mentioning it?

// When there is only 1 element in the selector, we do the user a favor and automatically select it for them
// so they don't have to spend extra time selecting the only possible value.
if (this.props.value || !this.props.items || this.props.items.length !== 1 || !this.props.onInputChange) {
return;
}
this.props.onInputChange(this.props.items[0].key);
}

executeOnCloseAndOnBlur() {
// Picker's onClose is not executed on Web and Desktop, so props.onClose has to be called with onBlur callback.
this.props.onClose();
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