Given a filter method that returns true if some condition is met, is it possible to invoke its opposite in HTML, e.g. to use:
"item in items | filter:!AllDay" instead of
"item in items | filter:AllDay" ? Or do you have to maintain two separate filter methods (one for false and one for true)?
As noted by ENDOH (this SO question is technically a duplicate), you can negate a filter by prepending '!' to the filter string, like this:
filter:'!'+myFilter Note that the '!' is quoted. The documentation is not terribly clear on this, and an example there would be helpful.
filter:{myPropertyName:'!'+'EverythingOtherThanMe'}
http://jsfiddle.net/U3pVM/33383/ , why last one is not display in list, event last one id is -12 not -1 ??shacker's answer didn't work for angular 1.0.7, so here's another way to do this:
// You can register this in your AppCtrl if you like, otherwise just use $scope. $rootScope.not = function(func) { return function (item) { return !func(item); } }; Then you would do this:
filter:not(myFilterMethod) 
$rootScope.not = _.negate; with benefit being that it works if func has multiple arguments.filter:({day: '!'+AllDay.day}) 
Another option is to create a new negation filter and pipe it:
.filter('not', function() { return function(input) { return !input; } }) "item in items | filter:AllDay | filter:not" 