You can wrap the input and the button in a div and also put it in the absolute position.
Here is a demo
HTML
<div ng-app="">
<div ng-controller='anim' >
<div ng-repeat="item in lst" ng-animate=" 'wave' ">
{{item}}
</div>
<div class="wrapperInput">
<input ng-model="cmt">
<button ng-click="clk()"> Slide </button>
</div>
</div>
</div>
CSS
</style> <!-- Ugly Hack due to jsFiddle issue: http://goo.gl/BUfGZ -->
<script src="http://code.angularjs.org/1.1.4/angular.min.js"></script>
<style>
/**/
.wrapperInput{position:absolute;top:30px;}
/**/
.wave-enter-setup, .wave-leave-setup {
-webkit-transition:all cubic-bezier(0.250, 0.460, 0.450, 0.940) .5s;
-moz-transition:all cubic-bezier(0.250, 0.460, 0.450, 0.940) 0.5s;
-o-transition:all cubic-bezier(0.250, 0.460, 0.450, 0.940) 0.5s;
transition:all cubic-bezier(0.250, 0.460, 0.450, 0.940) .5s;
line-height:100%;
}
.wave-enter-setup {
position:relative;
left:100%;
line-height:100%;
}
.wave-enter-start {
left:0;
line-height:100%;
}
.wave-leave-setup {
position:absolute;
left:0;
line-height: 100%;
}
.wave-leave-start {
left:-100%;
line-height: 10%;
}
JS
function anim($scope,$timeout){
$scope.lst = [];
$scope.master = ['[1] John who is 25 years old.','[2] Jessie who is 30 years old.','[3] Johanna who is 28 years old.','[4] Joy who is 15 years old.','[5] Mary who is 28 years old.','[6] Peter who is 95 years old.','[7] Sebastian who is 50 years old.','[8] Erika who is 27 years old.','[9] Patrick who is 40 years old.','[10] Samantha who is 60 years old.'];
$scope.lst.unshift($scope.master[Math.floor((Math.random()*10)+1)]);
$scope.clk = function() { clik();}
function clik() {
//alert('here');
$scope.lst.unshift($scope.master[Math.floor((Math.random()*10)+1)]);
$scope.lst.pop();
$timeout(function(){ clik();},2000);
}
clik();
};