Narek Mamikonyan Narek Mamikonyan - 1 year ago 63
AngularJS Question

How to control form validity from other directives

My form is:

<form name="regForm" novalidate>

<div class="form-group has-feedback" form-validation>
<label class="control-label">Username</label>
<div ensure-unique="{{user.username}}">
<input type="text" class="form-control" name="username"
ng-minlength="3" />

In ensure-unique directive I'm checking if the username taken or not, and in that case if username used I want to set my username field to invalid.
How can I do that, if I don't want to apply ensure-unique directive to
element? Because I want to isolate scope of this directive and use
. When I'm applying on input element the
doesn't work.

Answer Source

You could require a parent form controller, then get the corresponding ngModel controller by input's name like formCtrl['username']:

return {
  restrict: 'A',
  scope: {
    isPending: '=',
  require: '^form',
  link: function (scope, element, attrs, formCtrl) {
    var modelCtrl = formCtrl[attrs.ensureUnique];

    if (!modelCtrl) { return; }

    var counter = 0;
    scope.isPending = false;

    var validator = function (value) {
      modelCtrl.$setValidity('unique', false);
      scope.isPending = true;

      var currentCount = ++counter;

      checkUnique(value).then(function (isUnique) {
        if (currentCount !== counter) { return; }

        modelCtrl.$setValidity('unique', isUnique);
        scope.isPending = false;

      return value;



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