Description
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
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');
});