Using ng-repeat on multiple arrays

Question

I'm making a weather application but I'm stuck on what should be a simple task but I can't wrap my head around how this works since I'm new to Angular. Basically what I need is to iterate over two arrays at once and set some values from this array.

In theory this is what I wanna accomplish:

<div ng-repeat="city in cities" ng-repeat="temp in temperatures" id={{city.id}}>
    <span>{{temp}}</span>
</div>

But obviously you can't put multiple repeaters like this. If I put an ng-repeat on the span I get 12 spans but I only need 1 and I need this 1 to contain the current value of the iteration in the temperatures.

The arrays looks like this after being created dynamically using an API:

Cities: [object, object, object, object, object, object, object, object, object, object, object, object]

Temperatures: [-2.3, -0.2, -1.2, -25.4, 2.9, -4.8, -2.2, -12.1, 0.3, -5.9, -7.7, -0.1]

How would I do this?

Why so You have The date in different objects. Combine your data into one json object. This saves You a lot of hassel. — msohns
– msohns, Commented Jan 22, 2015 at 16:59

ltalhouarne · Accepted Answer · 2015-01-22 16:59:37Z

3

Use an index (assuming temperatures is the array of temperatures defined in the same controller):

<div ng-repeat="city in cities">
    <span>City: {{city}} - Temperature: {{temperatures[$index]}}</span>
</div>

answered Jan 22, 2015 at 16:59

ltalhouarne

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1 Comment

Chrillewoodz Over a year ago

It should be temperatures[$index] actually but that did it, thanks :) what exactly is the $index? Is that the current iteration value (1, 2, 3 etc) from cities loop?

Kalhan · Accepted Answer · 2015-01-22 17:15:20Z

3

you cant use two ng-repeat in one div.

you need a alternative way of doing this, please try this suggestion

<div ng-repeat="city in cities" id={{city.id}}>
    <span>{{temperatures[$index]}}</span>
</div>

---- for the best practice

don't use $index its a bad practice but you can achieve what u want in this case.

you can do something like this,

<div ng-repeat="city in cities">
    <span>City: {{city}} - Temperature: {{ getTemprature(city) }}</span>
</div>

in controller,

$scope.getTemprature = function(city) {
    var index = cities.indexOf(city);
    return temperatures[index];
}

because if you use orderBy with the ng-repeat $index will not behave like u assume, $index will get the ordered array $index not the actual array $index.

edited Jan 22, 2015 at 17:15

answered Jan 22, 2015 at 16:58

Kalhan

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Comments

Nate Barbettini · Accepted Answer · 2015-01-22 17:11:11Z

1

You can accomplish this with lodash's zip function. Try this:

Controller

$scope.combinedData = _.zip(cities, temperatures);

View

<div ng-repeat="row in combinedData" id="{{row[0].id}}">
    <span><b>{{row[0].name}}</b> {{row[1]}}</span>
</div>

Working fiddle: http://jsfiddle.net/hojrhLx5/1/

edited Jan 22, 2015 at 17:11

answered Jan 22, 2015 at 17:03

Nate Barbettini

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