When your textarea exceeds 15 characters, result becomes undefined — that's just how the ng-min/maxlength directives work. I think you'll have to write your own directive. Here is a directive that will block input after 15 characters:
<textarea my-maxlength="15" ng-model="result"></textarea>
app.directive('myMaxlength', function() {
return {
require: 'ngModel',
link: function (scope, element, attrs, ngModelCtrl) {
var maxlength = Number(attrs.myMaxlength);
function fromUser(text) {
if (text.length > maxlength) {
var transformedInput = text.substring(0, maxlength);
ngModelCtrl.$setViewValue(transformedInput);
ngModelCtrl.$render();
return transformedInput;
}
return text;
}
ngModelCtrl.$parsers.push(fromUser);
}
};
});
fiddle
Update: to allow more than 15 characters, but disable the submit button when the count exceeds 15:
link: function (scope, element, attrs, ngModelCtrl) {
var maxlength = Number(attrs.myMaxlength);
function fromUser(text) {
ngModelCtrl.$setValidity('unique', text.length <= maxlength);
return text;
}
ngModelCtrl.$parsers.push(fromUser);
}
fiddle
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