Disable ui-sref based on a condition - angularjs

Question

Can you tell me a way to disable the submit button, which changes to a new state by:
<a ui-sref="state">Submit</a>
The button should be enabled only when the form is valid.
ng-disabled with ui-sref does not work:
<form name="tickets">
<button ng-disabled="!canSave()"><a ui-sref="view">Submit</a></button>
</form>
canSave function inside app.js being:
$scope.canSave = function(){
return $scope.tickets.$dirty && $scope.tickets.$valid;
};

Answer 1

You could simply pair it with ng-click so that ng-disabled will work.
.controller('myCtrl', function($scope, $state) {
// so that you can call `$state.go()` from your ng-click
$scope.go = $state.go.bind($state);
})
<!-- call `go()` and pass the state you want to go to -->
<button ng-disabled="!canSave()" ng-click="go('view')>Submit</button>
Here's a more fancy way using a custom directive:
angular.module('myApp', ['ui.router'])
.config(function($stateProvider) {
$stateProvider.state('home', {
url: '/'
});
})
.controller('myCtrl', function() {
})
.directive('uiSrefIf', function($compile) {
return {
scope: {
val: '#uiSrefVal',
if: '=uiSrefIf'
},
link: function($scope, $element, $attrs) {
$element.removeAttr('ui-sref-if');
$compile($element)($scope);
$scope.$watch('if', function(bool) {
if (bool) {
$element.attr('ui-sref', $scope.val);
} else {
$element.removeAttr('ui-sref');
$element.removeAttr('href');
}
$compile($element)($scope);
});
}
};
})
;
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular-ui-router/0.2.13/angular-ui-router.min.js"></script>
<div ng-app="myApp" ng-controller="myCtrl">
<form name="form">
<input ng-model="foo" ng-required="true">
<button ng-disabled="form.$invalid">
<a ui-sref-if="!form.$invalid" ui-sref-val="home">test</a>
</button>
</form>
</div>

Answer 2

There is a pure CSS solution for the problem.
Just set the pointer-events on your a tag to none:
button[disabled] > a {
pointer-events: none;
}
Of course you should set a more accurate CSS selector to target just the buttons you want.

Answer 3

My take on the directive provided by #m59 (without introducing an isolated scope):
.directive('uiSrefIf', function($compile) {
return {
link: function($scope, $element, $attrs) {
var uiSrefVal = $attrs.uiSrefVal,
uiSrefIf = $attrs.uiSrefIf;
$element.removeAttr('ui-sref-if');
$element.removeAttr('ui-sref-val');
$scope.$watch(
function(){
return $scope.$eval(uiSrefIf);
},
function(bool) {
if (bool) {
$element.attr('ui-sref', uiSrefVal);
} else {
$element.removeAttr('ui-sref');
$element.removeAttr('href');
}
$compile($element)($scope);
}
);
}
};
})

Answer 4

The easiest way that I found to do it conditionally in the template
When your condition is met, i point it to the current state which doesn't activate the transition else I transition to the state needed.
<a ui-sref="{{ 1==1 ? '.': 'state({param:here})'}}">Disabled Link</a>

Answer 5

I had problems with the isolate scope and using other directives inside anchors, so here's my take, replacing the iscolate scope with regular attributes.
angular.module('app').directive('uiSrefIf', ['$compile', function($compile) {
var directive = {
restrict: 'A',
link: linker
};
return directive;
function linker(scope, elem, attrs) {
elem.removeAttr('ui-sref-if');
$compile(elem)(scope);
scope.$watch(attrs.condition, function(bool) {
if (bool) {
elem.attr('ui-sref', attrs.value);
} else {
elem.removeAttr('ui-sref');
elem.removeAttr('href');
}
$compile(elem)(scope);
});
}
}]);
Html Looks like this.
<a ui-sref-if condition="enableLink()" value="init.main">
<cover class="card-image" card="card"></cover>
</a>

Answer 6

ui-router v1.0.18 introduced support for ng-disabled on anchor tags.

Answer 7

in ui-sref you can try and hide url based on codition for example i have this code and it works in urls
<a ui-sref="category-edit({pk:category.id})" ng-show="canEdit(category.owner)" class="btn btn-primary"><i class="glyphicon glyphicon-pencil"></i></a>
and in my controller
$scope.canEdit = function(category){
return category == AuthUser.username ;
}
Authuser is a factory in my main page
<script>
// Configure the current user
var app = angular.module('myApp'); // Not including a list of dependent modules (2nd parameter to `module`) "re-opens" the module for
app.factory('AuthUser', function() {
return {
username: "{{ user.username|default:''|escapejs }}"
}
});
</script>