better custom validation for angular form - angularjs

Question

I searched, I know 'the directive way' to do custom validation, but it looks like a overkill to me, I hope there is a simpler way, so I tried somwthing like this.
it works, but really not sure it is the right way(or angular way).
.controller('vali', ['$scope', function vali($scope) {
var th = this
th.formData = {}
// watch password repeat
$scope.$watch(function() {
return th.password1
}, function(newPass) {
if(!customValidate(newPass)) th.form.pass2.$setValidity('custom', false)
else th.form.pass2.$setValidity('custom', true)
})
//custom validate: password repeat must equal to password
function customValidate(v) {
if(v === th.formData.password) return true
else return false
}
this.submit = function(form) {
if(!th.form.$invalid) th.postToServer(th.formData)
}
this.postToServer = function(data) {
//do post to server
console.log(data)
}
}])
html:
<div ng-controller='vali as v'>
<form name='v.form' ng-submit='v.submit'>
<input type='password' name='pass1' ng-model='v.formData.password' minlength='6' />
<input type='password' name='pass2' ng-model='v.password1' />
<div ng-messages='v.form.pass2.$error' ng-if='v.form.pass2.$dirty'>
<div ng-message='required'>required</div>
<div ng-message='custom'> not equal</div>
</div>
<button type='submit'>submit</button>
</form>
</div>

Answer 1

You don't need to create your own directive for this. There is already a built-in directive for the password validation.
You can use that like this :
<input name="password" required ng-model="password">
<input name="confirm_password"
ui-validate=" '$value==password' "
ui-validate-watch=" 'password' ">
The input will be valid when the expression in ui-validate is true, so you can have any validation you want by changing the expression.