Input field connected to a selection dropdown

I have set up a dropdown menu that is connected to a text area. When a selection is made from the dropdown, the text area is automatically populated with information from the same model. You can see a working example here: JSFiddle

However, I am now attempting to dynamically change the dropdown menu and have that change reflected in the text area. Even though I can update the dropdown by setting the value, the change is not being passed on to the text area. The ng-change event does not trigger when the dropdown is manually set, and I am unable to directly set the value of the text area since it is dependent on the dropdown model.

Is it possible to achieve what I am trying to do?

<div ng-controller="Ctrl">
            <div class="inputItem sectionArea">
                <label>Sample List:</label>
                <select class="allVars"
                        ng-change="selectAction()"
                        ng-model="allVarsDD"
                        ng-options="allVars.text_short for allVars in allVars"
                        >
                        <option value="">-- Select Option --</option>
                </select>
                <br/>
                <textarea class="frequentInstructions inputLine" type="textarea" name="frequentInstructions"
                          ng-model="allVarsDD.text_long"
                </textarea>
             </div>
<div>
<script>
var app = angular.module('app', []);
function Ctrl($scope) {  
$scope.allVars=[
    {"fid":"1","environment":"0","text_short":"Short text 1","text_long":"text_long_1"},
    {"fid":"1","environment":"0","text_short":"Short text 2","text_long":"text_long_2"},
    {"fid":"1","environment":"0","text_short":"Short text 3","text_long":"text_long_3"}
    ];
}
</script>

Answer №1

After some trial and error, I successfully managed to determine the correct syntax for configuring:

For instance, in order to assign it to item #1: $scope.allVariablesDropDown = $scope.allVariables[1];

I have made the necessary modifications to the fiddle to demonstrate the accurate implementation.

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