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angularjsangularjs-directive
Steve Holland
Steve Holland

Reputation: 629

AngularJS - Hide/Show directive output based on expression

I'm wanting to output some markup from a custom Directive, but only if the model contains some text.

I'm almost there, but I'm just not quite sure how to turn the template on/off when the model changes, and if this is even the most efficient way of doing it.

Here is the markup:

<div data-ng-controller="test">
<div class="box">
    <input type="text" id="search" maxlength="75" data-ng-model="keywords" />
</div>
<searched data-ng-model="keywords"></searched>
</div>

The JS:

var app = angular.module('myApp', []);

app.directive('searched', function(){
    return {
        restrict: 'E',
        replace: true,
        scope: {
            keywords: '=ngModel'
        },
        template: '<span><span class="field">You searched for:</span> {{ keywords }}</span> ',
        link: function(scope, element, attrs) {
            scope.$watch('keywords', function(newVal, oldVal){
                if(newVal === null) {
                    // Output nothing!
                } else {
                    // Output Template as normal.
                }
            }, true);

        }
    };
});

app.controller("test", ['$scope', function($scope) {
    $scope.keywords = null;
}]);

And an example JSFiddle

Upvotes: 2

Views: 4808

Answers (1)

dnc253
dnc253

Reputation: 40327

If I'm understanding what you want to do, the easiest way would be with an ng-show. Then you don't even need the $watch (or the link function for that matter)

app.directive('searched', function(){
    return {
        restrict: 'E',
        replace: true,
        scope: {
            keywords: '=ngModel'
        },
        template: '<span ng-show="keywords.length > 0"><span class="field">You searched for:</span> {{ keywords }}</span> '
    };
});

Updated fiddle

Upvotes: 8

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