Getting angular directive attribute value returns 'undefined'
When you use scope: true
a new scope will be created for this directive. Then, to your $watch
works correctly, you should create a new attribute to the current scope, called inputMask, that receives the attrs.inputMask
scope.inputMask = attrs.inputMask;
scope.$watch('inputMask', function (newVal) {
console.log('inputMask', newVal);
});
You can see a simplified Working fiddle here
The other option, is to use the a hash object in directive's scope attribute.
The directive docs writes:
{} (object hash) - a new 'isolate' scope is created. The 'isolate' scope differs from normal scope in that it does not prototypically inherit from the parent scope. This is useful when creating reusable components, which should not accidentally read or modify data in the parent scope.
(...)
@ or @attr - bind a local scope property to the value of a DOM attribute.
That way, you can create your scope binding the DOM attribute:
scope: {
inputMask: "@"
},
link: function (scope, element, attrs) {
scope.$watch('inputMask', function (newVal) {
console.log('inputMask', newVal);
});
/* ... */
}
![Fals](https://i.stack.imgur.com/RiWxd.jpg?s=256&g=1)
Fals
Software Architect, I do love the Web, Patterns, Agile, DevOps and the new Microservice trend
Updated on June 14, 2022Comments
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Fals about 2 years
I'm doing a directive for input mask. But, when I pass a string as value the attribute is undefined. If I pass directly the mask It's working.
.directive('inputMask', function () { return { restrict: 'EAC', scope: true, link: function (scope, element, attrs) { scope.$watch('inputMask', function (newVal) { console.log('inputMask', newVal); }); var maskType = scope.$eval(attrs.inputMask); switch (maskType) { case 'phone': $(element).inputmask("phone", { url: '@Url.Content("~/Scripts/jquery-inputmask/phone-codes/phone-codes.json")', onKeyValidation: function () { //show some metadata in the console console.log($(this).inputmask("getmetadata")["name_en"]); } }); break; case 'money': $(element).inputmask("decimal", { digits: 2 }); break; case 'moneyGrouped': $(element).inputmask("decimal", { radixPoint: ",", autoGroup: true, groupSeparator: ".", groupSize: 3, digits: 2 }); break; case 'email': $(element).inputmask('Regex', { regex: "[a-zA-Z0-9._%-]+@[a-zA-Z0-9-]+\\.[a-zA-Z]{2,4}" }); default: $(element).inputmask(maskType); } $(element).inputmask(scope.$eval(attrs.inputMask)); $(element).on('keypress', function () { scope.$eval(attrs.ngModel + "='" + element.val() + "'"); }); } }; });
Working (will get into default of the switch):
<input type="teste" name="teste" value="" ng-model="form.email" input-mask='{ "mask": "d/m/y", "autoUnmask" : true}'/>
Not working, attrs.inputMask is
undefined
(should enter in case 'money'):<input type="teste" name="teste" value="" ng-model="form.email" input-mask='money'/>
What is wrong?
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Fals over 10 yearsattrs.inputMask still undefined using this.
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Beterraba over 10 yearsDid you check the fiddles? What is your angular version?
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Fals over 10 yearscheck your self, just write the value of inputMask when you set as inputMask='phone' for exemple, is undefined