javascript - Angular1: How to reflect ng-model errors on another element? -

i have directive following template

<div>     <span class="label">my label</span>     <input ng-model="name" required> </div> 

i want label painted red when input field invalid.

how can that?

currently have directive sync errors ngmodelctrl wrapping div

 <div add-all-errors>    ...   </div> 

and directive's link function this:

const ngmodel = $element.find('[ng-model]').controller('ngmodel'); $scope.$watch(()=>ngmodel.$error, addallclasses, true);  

where addallclasses makes sure correct classes appear on element..

i tried adding same ng-model

  <div ng-model="name">   ...   </div> 

but did not see classes there..

any better way this?

this why use angularjs form... i'm not sure why people against using handy feature.

i've made plunker you. https://plnkr.co/edit/bgocqjwzlrq2atyzuynm?p=preview

<form name="form">     <span ng-class="{red: form.name.$invalid}">name:</span>     <input name="name" ng-model="name" required> </form> 

a little more insight of what's going on. form added scope auto magically angularjs it's name. in case, named form, can name.

now form ngform object , adds input field name attributes. way can form.name object similar ngform object. can use $invalid or $valid properties ng-class.

ngform pretty powerful , loaded many cool properties , methods. call console.log(scope.form); need put in method , add ng-change see updates.