checkbox validation is not working as expected - html

Question

I want to validate the form when user click the submit button using bootstrap and angularjs.If any of the field in the form is blank i want to dislay the error message below the blank elements.
Demo : https://plnkr.co/edit/55lFImusbCznYjLXypDu?p=preview
html code:
<form name="myForm" ng-controller="ExampleController">
<div>Select Color : </div>
<label name="team" ng-repeat="color in colorNames" class="checkbox-inline">
<input type="checkbox" name="color" value="{{color}}" ng-checked="selectedColor.indexOf(color) > -1" ng-click="userSelection(color)"> {{color}}
<br> </label><br>
<div ng-show="myForm.$submitted || myForm.color.$touched">
<p class="error-mesg" ng-show="headerForm.color.$error.required">Select the color</p>
</div>
<div class="">
<div style="color: black;">Username : </div>
<input type="text" name="user" value="" required>
<div ng-show="myForm.$submitted || myForm.user.$touched">
<p class="error-mesg" ng-show="myForm.user.$error.required">The Username is required</p>
</div>
</div>
<button type="submit" class="btn btn-primary" ng-click="submitForm(myForm)">Submit</button>
</form>
My above code is failing to show error message below the checkboxes when not selected.I want to show an error message "Please Select the color" below the checkboxes when user click on submit button without selecting atleast one checkbox.And when user click on any of the check box the error message should disappear.

Answer 1

You can add dynamically required for checkbox input: ng-required="selectedColor.length === 0"
if you do not select color, checkboxs will be required, when color is selected, then is it unrequired.
<input ng-required="selectedColor.length === 0" oninvalid="this.setCustomValidity('Please select the color')" type="checkbox" name="color" value="{{color}}" ng-checked="selectedColor.indexOf(color) > -1" ng-click="userSelection(color)">