nitin nitin - 1 month ago 6
AngularJS Question

Angularjs : Scroll to bottom of div

I'm having trouble scrolling to last message.



var app=angular.module('myApp', ['ngMaterial'] );
app.controller('ChatCtrl', function($window, $anchorScroll){
var self = this;
self.messageWindowHeight = parseInt($window.innerHeight - 170) + 'px';
self.messages = [];
for(var i = 1 ; i<=200;i ++){
self.messages.push(i);
}

self.user = { text : ""};
self.send = function(){
self.messages.push(angular.copy(self.user.text));
self.user.text = "";
}
});

app.directive('scrollToBottom', function($timeout, $window) {
return {
scope: {
scrollToBottom: "="
},
restrict: 'A',
link: function(scope, element, attr) {
scope.$watchCollection('scrollToBottom', function(newVal) {
if (newVal) {
$timeout(function() {
element[0].scrollTop = element[0].scrollHeight;
}, 0);
}

});
}
};
});

/* Styles go here */
.chat-box {
padding: 8px;
border-radius: 8px;
}
.message-box {
border-top: 1px solid #E0E0E0;
position: fixed;
right: 0;
bottom: 0;
width: 100%;
height: 120px;
background: white;
}

.message {
overflow: scroll;
margin: 4px;
border: 1px solid #E0E0E0;
-webkit-border-radius: 8px;
-moz-border-radius: 8px;
border-radius: 8px;
height: 110px;
}

<!DOCTYPE html>
<html>

<head>
<link rel="stylesheet" href="style.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/angular-material/1.0.9/angular-material.css">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=RobotoDraft:300,400,500,700,400italic">
</head>

<body ng-app='myApp' layout="column" layout-fill ng-controller="ChatCtrl as ctrl">
<!-- content starts here -->
<md-toolbar class="md-whiteframe-z2">
<div class="md-toolbar-tools">
<h2>
hello
</h2>
</div>
</md-toolbar>
<md-content layout="column" style="background-color: #F5F5F5;" ng-style="{'height':ctrl.messageWindowHeight}">
<div class="chat-box">
<ol class="discussion" scroll-to-bottom="ctrl.messages">
<li ng-repeat="message in ctrl.messages track by $index" id="msg-{{$index}}">
{{message}}
</li>
</ol>
</div>
</md-content>
<form name="userForm" novalidate ng-submit="ctrl.send()" layout="row" layout-padding layout-align="center center" class="message-box">
<div class="message" flex>
<md-input-container class="md-block">
<input type="text" name="text" ng-model="ctrl.user.text" />
</md-input-container>
</div>
<md-button class="md-icon-button" type="submit">
send
</md-button>
</form>

<!-- content ends here -->


<!-- Angular Material Dependencies -->
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.8/angular.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.8/angular-animate.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.8/angular-aria.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular-material/1.0.9/angular-material.js"></script>

<script src="script.js"></script>
</body>

</html>





Here's a plunk of my code.

Answer

Move the scroll-to-bottom directive to the md-content element

 <!-- MOVE directive here -->
 <md-content scroll-to-bottom="ctrl.messages" layout="column" style="background-color: #F5F5F5;" ng-style="{'height':ctrl.messageWindowHeight}">
      <div class="chat-box">
        <!-- NOT HERE
        <ol class="discussion" scroll-to-bottom="ctrl.messages">
        -->
        <ol class="discussion">
          <li ng-repeat="message in ctrl.messages track by $index" id="msg-{{$index}}">
            {{message}}
          </li>
        </ol>
      </div>
  </md-content>

The DEMO on PLNKR

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