Angular JS form running only first time

1. You are loading Angular more than once.

   

2. Your resetForm function doesn't reset the form at all. It just calls $setValidity on two of the form elements.
   It looks like it does try and reset the form in another part of your code with

   document.getElementById("searchCriteriaTags").innerHTML = "";
   document.getElementById("searchCriteriaIds").innerHTML = "";
   document.getElementById("images").innerHTML = "";
   

   which means you are modifying the DOM directly, about which see point 4.

3. You can add a simple check as to whether $scope.form.tags === '' and so the same for the other fields in your form.

4. Having addressed your 3 points, I'm afraid to say your code has bigger problems. You are modifying the DOM directly all over the place and you have a lot of duplicate code, plus lots of very complex conditionals.

EDIT 1 in response to OP's comment:

1. The Angular way of clearing form fields would be to simply clear the scope objects that the form fields are bound to. In other words it is as simple as doing something like:

   $scope.tags = [] // for arrays
   $scope.name = '' // for strings
   

   Because the form fields are bound to these scope variables through the ng-model directive, changing the variables will also change the form fields.

2. Setting an error message when two fields are empty you can do like this:

   $scope.checkFields = function(field1, field2) {
       var oneEmpty = field1 === '';
       var twoEmpty = field2 === '';
       if (oneEmpty && twoEmpty) {
           // call the failure message here
       }
   }
   

EDIT 2 in response comments:

1. Firstly good to see that your code is looking a lot cleaner. Secondly, the reason it fails is because in your search function you set the search fields to null, eg searchCriteria.tags = null;. You should set them to empty strings instead: searchCriteria.tags = '';.

2. I don't know what the purpose of checkFields is so I don't know where you want to place it. If you want to show an error message if the fields are empty then I'd say have checkFields() return a boolean and use ng-show to display the error div if checkFields() === false.

   HTML:

   <div ng-show="checkFields() === false">Fields can't be empty</div>
   

   JS:

   $scope.checkFields = function(field1, field2) {
       var oneEmpty = field1 === '';
       var twoEmpty = field2 === '';
       return (oneEmpty || twoEmpty);
   }