var app = angular.module('plunker', []);

app.directive('autoNgModel', function() {
  return {
    compile: function(element, attrs) {
      function setNgModel(e) {
        if (e.getAttribute('ng-model')) return;
        e.setAttribute('ng-model', (attrs.autoNgModel ? attrs.autoNgModel + '.' : '') + e.name);
      }
      angular.forEach(element.find('input'), setNgModel);
      angular.forEach(element.find('select'), setNgModel);
      angular.forEach(element.find('textarea'), setNgModel);
    }
  };
});
<!DOCTYPE html>
<html ng-app="plunker">

  <head>
    <meta charset="utf-8" />
    <title>AngularJS Plunker</title>
    <script>document.write('<base href="' + document.location + '" />');</script>
    <link rel="stylesheet" href="style.css" />
    <script data-require="angular.js@1.2.x" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.17/angular.min.js" data-semver="1.2.17"></script>
    <script src="app.js"></script>
  </head>

  <body>
    <form name="form1" auto-ng-model>
      <input type="text" name="input1">
      intput1 = {{input1}}
    </form>
    
    <form name="form2" auto-ng-model="data">
      <input type="text" name="input2">
      <select name="select">
        <option value="1">1</option>
        <option value="2">2</option>
        <option value="3">3</option>
      </select>
      <br />
      <textarea name="textarea"></textarea>
      <pre>data = {{data | json}}</pre>
    </form>
  </body>

</html>
/* Put your css in here */