Filtering based on properties of objects within array using $filter

Question

Assuming the following data:

var roster = [
    {
        id: 1,
        attended: true,
        person: {printName: 'Larry'}},
    {
        id: 2,
        attended: false,
        person: {printName: 'Curly'}},
    {
        id: 3,
        attended: true,
        person: {printName: 'Moe'}}];

I am trying to find the count of objects in the array where attended is true. I have tried the following:

rosters.html:

{{ (roster | filter:{attended:true} ).length }}

rosters-controller.js:

checkedInCount: function() {
    return $filter('filter')($scope.roster, attended.true).length;
}

The html filter works as expected, returning 2 in this instance. However, the function version encounters the error ReferenceError: Can't find variable: attended. I assume that there is something trivial that I've missed in the function, but I am not sure what it is.

Please compare attentively both of your versions. If you can't find what's going on, have a look at the expected type of the arguments. — Blackhole
– Blackhole, Commented Oct 17, 2014 at 16:33
Thanks for pointing that out. I had skimmed that page, but I completely misunderstood how to build the expression argument. After seeing @tasseKATT's answer, it totally makes sense now. — The DIMM Reaper
– The DIMM Reaper, Commented Oct 17, 2014 at 16:41
Could the downvoter please explain? My question turned out to have a simple answer, but I didn't think it was poor according to this Meta post. — The DIMM Reaper
– The DIMM Reaper, Commented Oct 23, 2014 at 4:03

tasseKATT · Accepted Answer · 2014-10-17 16:35:31Z

2

Use an object as the expression:

return $filter('filter')($scope.roster, { attended: true }).length;

answered Oct 17, 2014 at 16:35

tasseKATT

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1 Comment

The DIMM Reaper Over a year ago

Thanks so much, I'm kicking myself for not seeing that before.

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