javascript - How to disable or enable button according to if text boxes empty or not? -


i work on angularjs projerct.

i have button in template , 2 input text elements.

the button have enabled when 2 input boxes has string.

here html code:

    <form id="loginform" class="form-horizontal" role="form">         <div style="margin-bottom: 25px" class="input-group">             <span class="input-group-addon"><i class="glyphicon glyphicon-user"></i></span>             <input id="login-username" type="text" class="form-control" ng-model="username" placeholder="username">         </div>         <div style="margin-bottom: 25px" class="input-group">             <span class="input-group-addon"><i class="glyphicon glyphicon-lock"></i></span>             <input id="login-password" type="text" class="form-control" ng-model="password" placeholder="password">         </div>          <div style="margin-top:10px" class="form-group pull-left">             <div class="col-sm-12 controls">                 <input type="button"                         class="btn btn-success"                         value="enter"                         ng-click="inspectorarea.verify(username,password)"                         ng-disabled="(username == null || password == null)">             </div>         </div>     </form>

and here working plunker.

using row ng-disabled="(username == null || password == null) in input button element disable or enable button.

but not working properly, can see plunker-example, button enabled when text boxes has string first time, if remove string 1 of texts box elements button enable while want them disalbled.

any idea how can disable button if @ least 1 of text boxes empty?

initially username , password null. work. when type , delete, become empty , that's why didn't work.

i have modified check truthiness.

<input type="button"                         class="btn btn-success"                         value="enter"                         ng-click="inspectorarea.verify(username,password)"                         ng-disabled="(!username || !password)">

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