I have a json as follows:
[{
"_id": "58a58ea23744cd46918914ef",
"entityId": "ce7200c1-3430-47ce-ab81-7d0622cb8cae",
"name": "Portugal",
"description": "Portugal",
"type": "country",
"category": "common",
"subcategory": "common",
"parent": {
"_id": "58a8486ca4890027348a8966"
},
"image": {
"_id": "58a8486ca4890027348a8965"
},
"metadata": {
"primary": "pt",
"taxRate": 20,
"exchangeRate": 0.7,
"language": "PT",
"currency": "EUR",
"_id": "58a8486ca4890027348a8964"
}
}, {
"_id": "58a58ea23744cd46918914f1",
"entityId": "815b9e90-e36f-4488-ad50-6a259b6d034d",
"name": "Qatar",
"description": "Qatar",
"type": "country",
"category": "common",
"subcategory": "common",
"parent": {
"_id": "58a8486ca4890027348a8969"
},
"image": {
"_id": "58a8486ca4890027348a8968"
},
"metadata": {
"primary": "qa",
"taxRate": 20,
"exchangeRate": 0.7,
"language": "RO",
"currency": "RO",
"_id": "58a8486ca4890027348a8967"
}
}, {
"_id": "58a58ea23744cd46918914f2",
"entityId": "e12ea227-c05c-42cf-b746-6bc537812a02",
"name": "Romania",
"description": "Romania",
"type": "country",
"category": "common",
"subcategory": "common",
"parent": {
"_id": "58a8486ca4890027348a896c"
},
"image": {
"_id": "58a8486ca4890027348a896b"
},
"metadata": {
"primary": "ro",
"taxRate": 20,
"exchangeRate": 0.7,
"language": "RO",
"currency": "RON",
"_id": "58a8486ca4890027348a896a"
}
}, {
"_id": "58a58ea23744cd46918914f4",
"entityId": "8c22ccaf-f7b7-4009-9642-54580ad5ad4e",
"name": "Russia",
"description": "Russia",
"type": "country",
"category": "common",
"subcategory": "common",
"parent": {
"_id": "58a8486ca4890027348a8972"
},
"image": {
"_id": "58a8486ca4890027348a8971"
},
"metadata": {
"primary": "ru",
"taxRate": 20,
"exchangeRate": 0.7,
"language": "RU",
"currency": "RUB",
"_id": "58a8486ca4890027348a8970"
}
}, {
"_id": "58a58ea23744cd46918914fa",
"entityId": "725b2011-177b-4fc5-8e1f-559b3e4e8958",
"name": "United States",
"description": "United States",
"type": "country",
"category": "common",
"subcategory": "common",
"parent": {
"_id": "58a8486ca4890027348a8984"
},
"image": {
"_id": "58a8486ca4890027348a8983"
},
"metadata": {
"primary": "us",
"taxRate": 20,
"exchangeRate": 0.7,
"language": "EN",
"currency": "USD",
"_id": "58 a8486ca4890027348a8982"
}
}, {
"_id": " 58 a58ea23744cd46918914d8",
"entityId": "af884be9 - 067 d - 4 dd2 - 8646 - 5738 f5bb0efb",
"name": "Germany",
"description": "Germany",
"type": "country",
"category": "common",
"subcategory": "common",
"parent": {
"_id": "58 a8486ca4890027348a89b7 "
},
"image": {
"_id": "58 a8486ca4890027348a89b6 "
},
"metadata": {
"primary": "de",
"taxRate": 20,
"exchangeRate": 0.7,
"language": "DE",
"currency": "EUR",
"_id": "58 a8486ca4890027348a89b5 "
}
}]
And I'm displaying these values in dropdown with the following code:
Template:
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown" aria-haspopup="true">
{{selectedCurrency}}
<span class="caret"></span>
</button>
<ul class="dropdown-menu" aria-labelledby="dropdownMenu1">
<li *ngFor="let currency of currencies">
<a>{{currency.metadata.currency }}</a>
</li>
</ul>
</div>
Right now if you see, metadata has duplicate currency "EUR"
. Is there a pipe with angular2 so that I can display only the unique values of metadata.currency
Is there a unique filter in angular 2?
No, you would have to create your custom pipe to do this.
However, I don't think create a pipe
is really necessary, you can do it in your component.
You can get all the unique currencies
of those items doing the following:
export class AnyComponent {
items: any[];
currencies: string[];
constructor() {
// Populate your items... "items = blabla"
// Get all currencies
const curr = items.map(data => data.metadata.currency);
// Unique currencies
this.currencies = curr.filter((x, i, a) => x && a.indexOf(x) === i);
}
}
Then, in your template:
...
<ul class="dropdown-menu" aria-labelledby="dropdownMenu1">
<li *ngFor="let currency of currencies">
<a>{{currency}}</a>
</li>
</ul>
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