I have a group of arrays on my Angular2 app that I use to build a grouped list with *ngFor in my view:
[
{
category: 1,
items: [{ id: 1, name: "helloworld1" }, { id: 2, name: "helloworld2" }]
},
{
category: 2,
items: [{ id: 3, name: "helloworld3" }, { id: 4 }]
},
{
category: 3,
items:[{ id: 5 }, { id: 6 }]
}
]
I also have a boolean that when it's true should filter only the items that have the name property. If a group does not have any item that matches this condition it should not pass. So the result would be the following if the boolean is true:
[
{
category: 1,
items: [{ id: 1, name: "helloworld1" }, { id: 2, name: "helloworld2" }]
},
{
category: 2,
items: [{ id: 3, name: "helloworld3" }]
}
]
How can I implement a pipe to achieve this kind of result?
http://plnkr.co/edit/je2RioK9pfKxiZg7ljVg?p=preview
@Pipe({name: 'filterName'})
export class FilterNamePipe implements PipeTransform {
transform(items: any[], checkName: boolean): number {
if(items === null) return [];
let ret = [];
items.forEach(function (item) {
let ret1 = item.items.filter(function (e) {
return !checkName || (checkName && (e.name !== undefined));
});
if(ret1.length > 0) {
item.items = ret1;
ret.push(item);
}
});
return ret;
}
}
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