How to bind DOM property in directive - css

Question

Given this example:
var SomeApp = angular.module('SomeApp', [])
.controller('SomeController', function($scope){
$scope.items = [0,1,2,3]
})
.directive('gridResize', function(){
return {
scope: true,
link: function(scope, elem) {
scope.gridResize = {
width: $(elem).width(),
height: $(elem).height()
};
}
}
})
.parent {
width: 80%;
position: relative;
left: 50%;
transform: translateX(-50%);
border: 1px solid red;
}
.parent > * {
background-color: rgba(0,0,0,.14);
margin-bottom: 1px;
padding: 20px;
box-sizing: border-box;
}
.parent > *:last-child {
margin-bottom: 0;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="SomeApp">
<div class="parent" ng-controller="SomeController" grid-resize>
<div ng-style="{'min-height':($parent.gridResize.width/8) + 'px'}"
ng-repeat="item in items"
>
height: {{$parent.gridResize.height}} | width: {{$parent.gridResize.width}}
</div>
</div>
</div>
Can anyone tell me how I could bind the height and width of the grid-resize directive to the DOM element? I want the angular properties to change when the DOM element changes.

Answer 1

In your directive use the window "resize" event to update the sizes on the scope:
var SomeApp = angular.module('SomeApp', [])
.controller('SomeController', function($scope){
$scope.items = [0,1,2,3]
})
.directive('gridResize', function(){
return {
scope: false,
link: function(scope, elem) {
scope.gridResize = {
width: $(elem).width(),
height: $(elem).height()
};
angular.element(window).on('resize', function(e) {
scope.gridResize = {
width: $(elem).width(),
height: $(elem).height()
};
scope.$apply();
});
}
}
})
Also notice that I changed the directive's scope to 'false'. You already have a scope on that element created by the ng-controller directive.