how to arrange multiple api response in single array with in fixed format

Question

we need to arrange item in fixed format (by category) that are comming from multiple API's response ex: first to need to display all laptops, second display all PC's and so on..

    //fixed order
    this.itemList = [{
        id: '1', 
        name: 'Apple', 
        category: 'LAPTOP'
      }, {
        id: '2', 
        name: 'HP', 
        category: 'LAPTOP'
      }, {
        id: '3', 
        name: 'DELL', 
        category: 'PC'
      }, {
        id: '4', 
        name: 'SAMSUNG', 
        category: 'MOBILE'
      }, {
        id: '5', 
        name: 'LENOVO', 
        category: 'MOBILE'
      }];

here we don't want to call parallel api because of response delay, we need to show items according to api response but on ui the format fixed once all api response completed. Here is method for calling api:

loadItems() {
    this.itemList = [];
    this.itemService.getItems('LAPTOP').then((items) => {
      this.itemList = this.itemList.concat(items);
    });
    this.itemService.getItems('PC').then((items) => {
      this.itemList = this.itemList.concat(items);
    });
    this.itemService.getItems('TABLET').then((items) => {
      this.itemList = this.itemList.concat(items);
    });
    this.itemService.getItems('MOBILE').then((items) => {
      this.itemList = this.itemList.concat(items);
    });
}

So, if mobile api's response comes first, ui will display mobile items, after that if laptop api's response comes, it will show laptop first with maintain above format. thanks

you can use orderBy in your repeat but that will have a particular order and not like whichever comes first — tanmay
– tanmay, Commented Apr 10, 2017 at 10:07

Fefux · Accepted Answer · 2017-04-10 09:31:39Z

2

If you use Promise, Promise.all return responses in order:

loadItems() {
    this.itemList = [];
    Promise.all([
         this.itemService.getItems('LAPTOP'),
         this.itemService.getItems('PC'),
         this.itemService.getItems('TABLET'),
         this.itemService.getItems('MOBILE')
    ]).then((values) => {
         this.itemList = [].concat(values[0], values[1], values[2], values[3]);
    }).catch((err) => console.log('don\'t forget to handle error'));
}

answered Apr 10, 2017 at 9:31

Fefux

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2 Comments

tanmay Over a year ago

or, using $q of Angular, $q.all gets the same result

Chandra Kant Paliwal Over a year ago

actully i don't want to call api in such a way(parallel) as i wrote above, because i need to display lazy load.

Fefux · Accepted Answer · 2017-04-10 11:31:26Z

1

Ok, in this case, you could do something like this:

loadItems() {
    this.itemList = [ [], [], [], [] ];
    this.itemService.getItems('LAPTOP').then((items) => {
      this.itemList[0] = items;
      render(this.itemList);
    });
    this.itemService.getItems('PC').then((items) => {
      this.itemList[1] = items;
      render(this.itemList);
    });
    this.itemService.getItems('TABLET').then((items) => {
      this.itemList[2] = items;
      render(this.itemList);
    });
    this.itemService.getItems('MOBILE').then((items) => {
      this.itemList[3] = items;
      render(this.itemList);
    });
}

Where render is the function that will going to update your page with your new data :

function render(items) {
    var flatItems = [].concat.apply([], items);
    // do page update...
    ...
}

answered Apr 10, 2017 at 11:31

Fefux

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1 Comment

Chandra Kant Paliwal Over a year ago

@Fexfux this is good option too but we implemented throgh angular filter, thanks for your effort, this is result actually want.

xkeshav · Accepted Answer · 2017-04-10 09:36:32Z

0

you can use promise .

suppose you have 4 methods

getLaptop();
getPc() ;
getTablet();
getMobile();

and use in chained methods like

 var dataList = [];
 $q.all({'laptop': getLaptop,'pc': getPc, 'tablet':getTablet, 'mobile':getMobile}).then(function(data) {
  angular.extend(dataList, data.laptop, data.pc, data.tablet, data.mobile);
}).catch(function(err) {
console.error('Error:', err);
});

answered Apr 10, 2017 at 9:36

xkeshav

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