In previous article, we discussed how to sort
nested data in Angular 8. One of reader need help to filter nested data.
Just Copy this code and paste in your constructor.
Here is the code to filter nested data. Which is general code to filter whole table with nested data.
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constructor() { this.dataCompanySource.filterPredicate = (data,
filter:string)=> {
const accumulator = (currentTerm, key) => {
return this.nestedFilterCheck(currentTerm, data, key);
};
const dataStr = Object.keys(data).reduce(accumulator, '').toLowerCase();
// Transform the filter by
converting it to lowercase and removing whitespace.
const transformedFilter = filter.trim().toLowerCase();
return
dataStr.indexOf(transformedFilter) !== -1;
};
}
nestedFilterCheck(search, data, key) {
if (typeof data[key] === 'object') {
for (const k in data[key]) {
if (data[key][k] !== null) {
search = this.nestedFilterCheck(search,
data[key], k);
}
}
} else {
search += data[key];
}
return search; }
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