Show Hide DIV on DropDownList change in AngularJS

I have the following drop-down list on my angular JS page:

<div class="col-md-4 fieldMargin">
    <div class="dropdownIcon">
        <select name="actions" id="actions"
                ng-init="Data.formStatus.Action=Data.Actions[0]"
                ng-options="option.Value for option in Data.Actions"
                ng-focus="ActionsLabel = true" ng-blur="ActionsLabel = false;"
                ng-model="Data.formStatus.Action">
        </select>
        <label for="actions" class="labelColor"
                ng-class="{'dropdownLabelFloat' : (ActionsLabel || Data.formStatus.Action != null), 'dropdownLabel' : !ActionsLabel && !Data.formStatus.Action  }">
            Action
        </label>
    </div>
</div>

These are the options for the above drop-down:

Test1
Test12
Test14
Test18
Test25
and so on

Based on whatever selection, user makes, in the above drop-down list, I want to change the label text of another control on the same page:

this is another control:

<div class="col-md-12 inputEmailSection">
    <input type="text" name="to" id="to"
        ng-focus="ToLabel = true" ng-blur="ToLabel = false;"
        ng-model="Data.EmailInput.To" />
    <label for="to" class="labelColor"
        ng-class="{'inputLabelFloat' : (ToLabel || Data.EmailInput.To!= null), 'inputLabel' : !ToLabel && !Data.EmailInput.To}">
        To
    </label>
</div>

In the Action drop-down, if the user selects "Test1" then I want the data to be coming from model:

Data.EmailInput.To

but if the user selects "Test18" from the Action drop down then I want the model to be:

Data.EmailInput.ToSpecialCase

<div class="col-md-12 inputEmailSection">
    <input type="text" name="to" id="to"
                                   ng-focus="ToLabel = true" ng-blur="ToLabel = false;"
                                   ng-model="Data.EmailInput.ToSpecialCase" />
    <label for="to" class="labelColor"
        ng-class="{'inputLabelFloat' : (ToLabel || Data.EmailInput.To!= null), 'inputLabel' : !ToLabel && !Data.EmailInput.To}">
        To
    </label>
</div>

Is it possible to do something on angular Js HTML page. I know, I can put if else condition on angular Js html page like this:

<div ng-if="someCondition"></div>
<div ng-else-if="someOtherCondition"></div>

I am not sure how to capture the selected value from the Action drop-down and then make a condition from that selected value. I am very new to angular JS.

Any help on this will be highly appreciated.