I've written a directive with an isolate scope.
app.directive('myDirective', function() {
return {
restrict: 'E',
scope {
attr1: '#',
attr2: '#',
noValueAttr: // what to put here?
},
link: function(scope, elem, attrs) {
// how to check here if noValueAttr is present in mark-up?
}
};
});
the html could be
<my-directive attr1='...' attr='...' ... no-value-attr>
or
<my-directive attr1='...' attr='...' >
I am wondering how to use (and have the directive detect if it's there or not) an optional attribute which has no assigned value. Thanks.
Just use attrs.hasOwnProperty('noValueAttr') in the link function to test whether the attribute is present or not.
Don't forget the attribute in markup would be no-value-attr, not noValueAttr like you showed.
link: function(scope, elem, attrs) {
if (attrs.hasOwnProperty('noValueAttr'))
// attribute is present
else
// attribute is not present
}
I know it is an old question, but there is that way to:
link: function(scope, elem, attrs) {
scope.noValueAttr = scope.$eval(attrs.noValueAttr) || 'default value';
}
Related
I have a custom directive:
<custom-directive style='height: {{window.innerHeight + "px"}}'></custom-directive>
myApp.directive('customDirective', function(){
return {
restrict: 'E',
templateUrl: '/views/controls/customTemplate.html'
};
});
So, the expression style='height: {{window.innerWidth + "px"}}' doesn't work. App just ignores it. How to make it work?
Write a link function in directive where you will get directive element as and argument use that to change the css of the element.
Like if you want to change the color of the directive text do like this -
link: function(scope, elem, attr) {
elem.css('color','red');
}
Diective
myApp.directive('customDirective', function(){
return {
restrict: 'E',
templateUrl: '/views/controls/customTemplate.html',
link: function(scope, elem, attr) {
elem.css('color','red');
}
};
});
I can't seem to find a way to update my ng-model in my directive
My directive looks like this
app.directive('DatepickerChanger', function () {
return {
restrict: 'E',
require: 'ngModel',
scope: {
Model: '=',
startDate: '=',
endDate: '=',
},
templateUrl: function(elem,attrs) {
return '/AngularJS/Directives/msDatepickerTpl.html'
},
link: function (scope, element, attrs, ngModel) {
ngModel = new Date();
}
}
});
And i use it like this
<DatepickerChanger ng-model="date" required></DatepickerChanger>
Where date is a other date object
If i console.log the ng-model, i can see that it's change it's value, but can't see it from the place where i call the directive. anyone got a clue to what im doing worng
You are using it wrong. This ngModel is a controller. Your code should look like this:
link: function (scope, element, attrs, ngModel) {
ngModel.$setViewValue(new Date());
}
Also, the directive should be called datepickerChanger and referenced in html as datepicker-changer
EDIT:
You want to update the ngModel after changing the input, for example. One way to do that is use the bind function to capture the events of the input field (I cant see your template, but I imagine that will have one input):
link: function (scope, element, attrs, ngModel) {
element.find('input').bind('change', function() {
// Do something with this.value
ngModel.$setViewValue(newDate);
});
}
Say I have the following directive:
myApp.directive('myDirective', function() {
return {
restrict: 'A',
require: 'ngModel',
scope: {
ngModel: '='
},
link: function(scope, elem, attrs, ngModelCtrl) {
scope.$watch('ngModel', function() {
ngModelCtrl.$modelValue = 'foo';
});
}
}
});
And the following html:
<input ng-model="name" my-directive></input>
Basically, whenever the user changes the input, my-directive would ideally change the internal model value to "foo" while leaving the view value untouched.
But when I print out $scope.name in the corresponding controller, it doesn't log "foo", it logs whatever the user entered in.
It would seem that ngModelCtrl.$modelValue is not what the controller is accessing -- am I approaching this problem incorrectly?
(Also watching the ngModel in the scope feels really wrong, but I'm not sure of any other way. Any suggestions would be much appreciated!)
If you are looking for view change, you should never register a watch. ngModelController's $viewChangeListeners are specifically designed for this purpose and to avoid creating any additional watch on the ngModel. You can also remove 2 way binding set up on the ngModel.
I can think of this way.
.directive('myDirective', function($parse) {
return {
restrict: 'A',
require: 'ngModel',
link: function(scope, elem, attrs, ngModelCtrl) {
/*Register a viewchange listener*/
ngModelCtrl.$viewChangeListeners.push(function(){
/*Set model value differently based on the viewvalue entered*/
$parse(attrs.ngModel).assign(scope, ngModelCtrl.$viewValue.split(','));
});
}
}
});
Demo
While thinking about it the other way around (Credits #Cody) it becomes more concise and appropriate while using a $parser.
ngModelCtrl.$parsers.push(function(val) { return val.split(',') });
I have an attribute directive that I use on an input=text tag like this:
<input type="text" ng-model="helo" my-directive />
On my directive I'm trying to use the ngModelController to save the initial value of my input, in this case the value of the ng-model associated with it.
The directive is like this:
app.directive('myDirective', function () {
return {
restrict: "A",
scope: {
},
require: "ngModel",
link: function (scope, elm, attr, ngModel) {
console.log("hi");
console.log(ngModel.$modelValue);
console.log(ngModel.$viewValue);
console.log(elm.val());
}
}
});
The problem is that ngModel.$modelValue is empty maybe because at the time the directive is initialized the ngModel wasn't yet updated with the correct value. So, how can I store on my directive the first value that is set on my input field?
How to correctly access ngModel.$modelValue so that it has the correct value?
I'll also appreciate an explanation on why this isn't working as I'm not clearly understanding this from reading the docs.
Plunkr full example: http://plnkr.co/edit/QgRieF
Use $watch in myDirective
app.directive('myDirective', function () {
return {
restrict: "A",
scope: {
},
require: "ngModel",
link: function (scope, elm, attr, ngModel) {
var unwatch = scope.$watch(function(){
return ngModel.$viewValue;
}, function(value){
if(value){
console.log("hi");
console.log(ngModel.$modelValue);
console.log(ngModel.$viewValue);
console.log(elm.val());
unwatch();
}
});
}
}
});
For Demo See This Link
I'm hoping this isn't a duplicate - plenty of similar questions about but I can't find an answer that works.
I have an Angular directive, thus:
app.directive('emailInput', function(){
return {
restrict: 'E',
templateUrl: 'template.html',
link: function(scope, elem, attrs, ctrl){
elem.bind('keyup', function(){
// TODO - what?
})
}
}
}
and in the template html:
<input type="email" required ng-model="emailAddress" />
Without knowing the name of the form, inside the link function, I want to know the value of the emailAddress.$valid property - how can I get this?
You can require the formController which would give you access to all of the inputs registered to the form
app.directive('emailInput', function(){
return {
require: '^form', // We look for it on a parent, since it will be defined somewhere higher on the DOM.
restrict: 'E',
templateUrl: 'template.html',
link: function(scope, elem, attrs, ctrl){
elem.bind('keyup', function(){
ctrl.emailAddress.$valid //check validity
})
}
}
}
Remember that Angular keeps track of input elements by name. So you have to give your input a name attribute
<input type="email" required ng-model="emailAddress" name="emailAddress" />
I would also recommend possibly just passing all of this through a directive attribute. You probably don't want to hard code the field names. So you could just have an attribute that takes the validity
inputIsValid='formName.emailAddress.$valid'
And evaluate (or $watch it) in your directive.
We can check validity more easily without knowing the name of input elements.
app.directive('emailInput', function(){
return {
require: '^form', // We look for it on a parent, since it will be defined somewhere higher on the DOM.
restrict: 'E',
templateUrl: 'template.html',
link: function(scope, elem, attrs, ctrl){
elem.bind('keyup', function(){
ctrl.$valid //check validity here
})
}
}
}
This is an old post but for the people who get here by googling, this is the cleanest way to check validity of an input in your directive without knowing its name, so you can use your directive on any input element.
You just need to require the ngModelcontroller:
app.directive('emailInput', function(){
return {
require: 'ngModel'
restrict: 'E',
templateUrl: 'template.html',
link: function(scope, elem, attrs, ngModelCtrl){
elem.bind('keyup', function(){
ngModelCtrl.$valid //check validity
})
}
}
}
See the AngularJS document for ngModel.NgModelController, $valid under the Properties section:
https://docs.angularjs.org/api/ng/type/ngModel.NgModelController
Know it's an old thread but if someone runs into this problem this is how I solved it:
app.directive('emailInput', function(){
return {
restrict: 'E',
templateUrl: 'template.html',
controller:function($scope){
$scope.isInvalid = function(){
return $scope.myelem.data().$ngModelController.$invalid;
}
},
link: function(scope, elem, attrs){
$scope.myelem = $(elem).find("input");
}
}
}
Here is a directive that will set dirty to true even if nothing has been typed in.
By default $dirty is set if something is typed in and wouldn't show a required error message until the user submits. With this
function() {
return function (scope, element, attrs) {
$(element).blur(function () {
scope.$apply(function() {
var field = scope.$eval(attrs.makeDirty);
field.$dirty = true;
});
});
};
HTML:
<label class="fieldLabel" for="confirmEmail">Confirm Email*</label>
<input type="text" id="confirmEmail" name="confirmEmail" ng-model="confirmEmail" ng-pattern="{{Ctrl.Model.Email.EmailAddress}}" required make-dirty="form.confirmEmail">
<span class="error" ng-show="form.confirmEmail.$error.pattern && form.confirmEmail.$dirty">Emails must match</span>
<span class="error" ng-show="form.confirmEmail.$error.required && (form.$submitted || form.confirmEmail.$dirty)">Confirm your email</span>
That allows me to give feedback as the user is filling out or tabbing on the form.
Let me give you another way to do it, it can be useful in some cases
link: function (scope, element, attrs, formCtrl) {
scope.fileSizeError=false;
scope.$watch(function () {
return formCtrl.fileP.$error.maxSize;
},function(newValue) {
scope.fileSizeError=newValue;
});
}
In my case I was inside a directive that is used to upload a file so I needed to know the state of the var $error.maxSize in the template so I did in that way.