Develop Reference

AngularJS custom directive doesn't load

I'm using angular 1.4.x.
I'm making a custom directive that checks weather a field is unique on the server (the field is called "jmbg"). I have the following code:
(function() {
angular
.module('app')
.directive('uniqueJmbg', uniqueJmbg);
uniqueJmbg.$inject = ['$q', '$http'];
function uniqueJmbg($q, $http) {
restrict: 'A',
require: 'ngModel',
link: function(scope, elem, attrs, ngModelCtrl) {
ngModelCtrl.$asyncValidators.uniqueJmbg = function(modelValue, viewValue) {
var value = modelValue || viewValue;
return $http.get('/server/users/' + value)
.then(function resolved() {
return $q.reject('exists');
}, function rejected() {
return true;
});
};
}
}
})();
I am using the directive in HTML in the following way:
<input class="form-control" type="text" id="jmbg" name="jmbg" ng-model="rad.radnik.jmbg" ng-model-options="{ updateOn: 'default blur', debounce: {'default':400, 'blur':0 } }" unique-jmbg/>
In case it matters, I'm using my controllers with the controllerAs syntax.
Now, what happens is that the file containing my uniqueJmbg definition never loads (I can't see it in the browser debugger). If I move my code to a component which does load the app stops working (and there are no errors in the console), so there is no way for me to debug this.
Any idea what might be so wrong I can't even access the code in the browser?

Add dependencies to the module
angular
.module('app', [])
.directive(...
And you need to return an object from the module, so the correction would be:
function uniqueJmbg($q, $http) {
return {
restrict: 'A',
require: 'ngModel',
link: function(scope, elem, attrs, ngModelCtrl) {
...
}
};
}

ng-select options are doubled when used with a custom directive

I am trying to implement dynamically configurable fields. I will get validation rules ng-required, ng-hidden, ng-disabled etc attributes as json from the server and set them dynamically through a directive.
I have the following directive code. It displays select values doubled JsBin link is http://jsbin.com/jiququtibo/1/edit
var app = angular.module('myapp', []);
app.directive('inputConfig', function( $compile) {
return {
require: 'ngModel',
restrict: 'A',
scope: '=',
compile: function(tElem, tAttrs){
console.log("compile 2");
tElem.removeAttr('data-input-config');
tElem.removeAttr('input-config');
tElem.attr('ng-required',true);
return {
pre: function (scope, iElement, iAttrs){
console.log('pre');
},
post: function(scope, iElement, iAttrs){
console.log("post");
$compile(tElem)(scope);
}
}
}
};
});
How can I solve this issue? I should be able to add directive dynamically.

To solve your problem you need to remove the following line from your post function:
$compile(tElem)(scope);
It's not clear to me why you are compiling here so I'm not sure if there will be any unintended side effects from this.

I found a solution following code is working.You should first clone, remove directive, prepare dom and compile
app.directive('inputConfig', function( $compile) {
return {
require: '?ngModel',
restrict: 'A',
compile:function (t, tAttrs, transclude){
var tElement = t.clone() ;
tElement.removeAttr('input-config');
tElement.attr('ng-required',true);
t.attr('ng-required',true);
return function(scope){
// first prepare dom
t.replaceWith(tElement);
// than compile
$compile(tElement)(scope);
};
}
}
});

How to check form validation inside directive applied to itself?

With AngularJS, I'm trying to check validity of a form within a custom directive.
In the template:
<form name="formName" custom-directive="someController.function()">
...
</form>
In JavaScript:
angular.module("myApp")
.directive("customDirective", function () {
return {
restrict: 'A',
link: function (scope, element, attrs) {
var callbackFn = attrs.customDirective;
// Check form validation, then call callbackFn
scope.$eval(callbackFn);
}
};
}
);
Usually, we can see form validation with scope.formName.$valid, but the form's name can be different, so I need a generic way to access it.

You need to add require: 'form' directive:
.directive("customDirective", function () {
return {
require: 'form',
restrict: 'A',
link: function (scope, element, attrs, formController) {
var callbackFn = attrs.customDirective;
// Check form validation, then call callbackFn
if (formController.$valid) {
scope.$eval(callbackFn);
}
}
};
}
After that form controller will be injected as fourth argument into link function, and you would be able to check form validity with formController.$valid property.

AngularJS; Send a function from the parent into directive scope

I'm creating a reusable component/widget as a directive using a template and isolated scope. I'd like to be able to also send a callback into the directive and call it in the widget. Is this possible?
Something like...
mainView template:
<my-widget callback="someFunction"></my-widget>
directive:
return {
restrict: 'E',
scope: {
callback: '='
},
templateUrl: '/partials/widget.html',
}
And the template:
<input type="text" ng-change="callback()" />
So when the widget value is changed, it triggers the callback function that was passed in the main view

What you're looking for is &. Quoting the old angular docs: "& or &attr - provides a way to execute an expression in the context of the parent scope".
Try this as your directive code:
return {
restrict: 'E',
scope: {
callback: '&'
},
templateUrl: '/partials/widget.html',
}

You can also $watch for it in the link or controller.
.directive('myDirective', function() {
return {
restrict: 'E',
link: function(scope, element, attrs) { {
scope.$watch(attrs.myDirective, function(value){ ... });
}
...

Turns out I needed to do as suggested and use an & rather than an =, but also this still wouldn't work until I added ng-model as well to my input:
<input type="text" ng-model="myValue" ng-change="callback()" />

How to create a custom input type?

I would like to create a custom input type similar to the way AngularJS implements "email", for example.
<input type="email" ng-model="user.email" />
What I would like to create is an input type like this:
<input type="path" ng-model="page.path" />
Any ideas on how this can be accomplished? So far, I've only been able to figure out how to implement custom directives where 'path' is the name of the tag, attribute or class.
For example, I can get this to work but it is inconsistent with the other form fields and I'd really like them to look the same.
<input type="text" ng-model="page.path" path />
app.directive('path', function() {
return {
require: 'ngModel',
link: function(scope, elm, attrs, ctrl) { ... }
};
});

You can create your own input type="path" by creating an input directive with custom logic if the type attribute is set to "path".
I've created a simple example that simply replaces \ with /. The directive looks like this:
module.directive('input', function() {
return {
restrict: 'E',
require: 'ngModel',
link: function (scope, element, attr, ngModel) {
if (attr.type !== 'path') return;
// Override the input event and add custom 'path' logic
element.unbind('input');
element.bind('input', function () {
var path = this.value.replace(/\\/g, '/');
scope.$apply(function () {
ngModel.$setViewValue(path);
});
});
}
};
});
Example
Update: Changed on, off to bind, unbind to remove jQuery dependency. Example updated.

An alternative solution can be achieved by using the $parsers property of the ngModelController. This property represents a chain of parsers that are applied to the value of the input component before passing them to validation (and eventually assigning them to the model). With this, the solution can be written as:
module.directive('input', function() {
return {
restrict: 'E',
require: 'ngModel',
link: function (scope, element, attr, ngModel) {
if (attr.type !== 'path') return;
ngModel.$parsers.push(function(v) {
return v.replace(/\\/g, '/');
});
}
};
});
Note that there is another property $formatters which is a pipeline of formatters that transform a model value into the value displayed in the input.
See here for the plunker.

Considering compile function is the first in line, would it not be better with:
module.directive('input', function() {
return {
restrict: 'E',
require: 'ngModel',
compile: function Compile(tElement, tAttrs) {
if (tAttrs.type !== 'path') return;
return function PostLink(scope, element, attr, ngModel) {
// Override the input event and add custom 'path' logic
element.unbind('input');
element.bind('input', function () {
var path = this.value.replace(/\\/g, '/');
scope.$apply(function () {
ngModel.$setViewValue(path);
});
});
}
}
};
});