This function calculates the sum of all numbers in array. If the expressions is supplied,
it is evaluated once for each element in array and then the sum of these values is returned.
Note: this function is used to augment the Array type in angular expressions. See
angular.Array for more info.
Usage
angular.Array.sum(array, expression);
Parameters
array –
{Array}
– The source array.
expression –
{(string|function())=}
– Angular expression or a function to be evaluated for each
element in array. The array element becomes the this during the evaluation.
Returns
{number} Sum of items in the array.
Example
<table ng:init="invoice= {items:[{qty:10, description:'gadget', cost:9.95}]}">
<tr><th>Qty</th><th>Description</th><th>Cost</th><th>Total</th><th></th></tr>
<tr ng:repeat="item in invoice.items">
<td><input name="item.qty" value="1" size="4" ng:required ng:validate="integer"></td>
<td><input name="item.description"></td>
<td><input name="item.cost" value="0.00" ng:required ng:validate="number" size="6"></td>
<td>{{item.qty * item.cost | currency}}</td>
<td>[<a href ng:click="invoice.items.$remove(item)">X</a>]</td>
</tr>
<tr>
<td><a href ng:click="invoice.items.$add()">add item</a></td>
<td></td>
<td>Total:</td>
<td>{{invoice.items.$sum('qty*cost') | currency}}</td>
</tr>
</table>
//TODO: these specs are lame because I had to work around issues #164 and #167
it('should initialize and calculate the totals', function() {
expect(repeater('.doc-example-live table tr', 'item in invoice.items').count()).toBe(3);
expect(repeater('.doc-example-live table tr', 'item in invoice.items').row(1)).
toEqual(['$99.50']);
expect(binding("invoice.items.$sum('qty*cost')")).toBe('$99.50');
expect(binding("invoice.items.$sum('qty*cost')")).toBe('$99.50');
});
it('should add an entry and recalculate', function() {
element('.doc-example a:contains("add item")').click();
using('.doc-example-live tr:nth-child(3)').input('item.qty').enter('20');
using('.doc-example-live tr:nth-child(3)').input('item.cost').enter('100');
expect(repeater('.doc-example-live table tr', 'item in invoice.items').row(2)).
toEqual(['$2,000.00']);
expect(binding("invoice.items.$sum('qty*cost')")).toBe('$2,099.50');
});