将滚动保持在底部，除非用户更改滚动的位置 [英] Keep the scroll at the bottom unless user changes the position of the scroll
问题描述
几天前，我问我如何在新数据进入时将滚动条保持在底部。我得到了这个答案，对我来说工作完全正常。但现在我有一个新的要求。我想滚动条停留在我拿它的地方。例如，当页面加载时，如果我不触摸滚动条，则滚动条应保持在底部。但如果我触摸它，并采取它，那么它应该留在那里，不会自动下来。
A few days ago I asked how can I keep my scroll bar at the bottom when new data comes in. I got this answer which worked perfectly fine for me. But now I have a new requirement. I want the scroll bar to stay where I take it. For example, when the page loads and if I don't touch the scroll bar, then the scroll bar should remain at the bottom. But if I touch it and take it up, then it should stay there and not come down automatically.
这是我有的代码：
<style>
#conversationDiv {
height: 900px;
overflow: auto;
}
</style>
<script>
$(function () {
setInterval(function() {
var element = document.getElementById("conversationDiv");
element.scrollTop = element.scrollHeight;
}, 0);
});
</script>
<div id="conversationDiv">
编辑：我发布了下面的完整代码，显示邮件来自哪里，获得附加到什么div。
I am posting the full code below which shows where the messages are coming from and where they are getting appended to what div.
<!DOCTYPE html>
<html>
<head>
<title>Hello WebSocket</title>
<script
src="https://cdnjs.cloudflare.com/ajax/libs/sockjs-client/1.1.0/sockjs.js"> </script>
<script
src="https://cdnjs.cloudflare.com/ajax/libs/stomp.js/2.3.3/stomp.js"></script>
<script src="https://code.jquery.com/jquery-2.1.4.js"></script>
<style>
#conversationDiv {
height: 900px;
}
</style>
<script>
$(function () {
setInterval(function() {
var element = document.getElementById("conversationDiv");
element.scrollTop = element.scrollHeight;
}, 0);
});
</script>
<script type="text/javascript">
var stompClient = null;
function setConnected(connected) {
document.getElementById('connect').disabled = connected;
document.getElementById('disconnect').disabled = !connected;
document.getElementById('conversationDiv').style.visibility = connected ? 'visible' : 'hidden';
document.getElementById('response').innerHTML = '';
}
function connect() {
var socket = new SockJS("http://twitchbot-farazdurrani.rhcloud.com:8000/hello/");
stompClient = Stomp.over(socket);
stompClient.connect({}, function(frame) {
setConnected(true);
console.log('Connected: ' + frame);
stompClient.subscribe("/topic/greetings", function(greeting){
showGreeting(greeting.body);
});
});
}
function disconnect() {
if (stompClient != null) {
stompClient.disconnect();
}
setConnected(false);
console.log("Disconnected");
}
function sendName() { //I am not sending anything so remove this..
var name = document.getElementById('name').value;
stompClient.send("/app/hello", {}, JSON.stringify({ 'name': name }));
}
function showGreeting(message) {
var response = document.getElementById('response');
var p = document.createElement('p');
p.style.wordWrap = 'break-word';
p.appendChild(document.createTextNode(message));
response.appendChild(p);
}
</script>
</head>
<body onload="connect()">
<div>
<div>
<button id="connect" onclick="connect();">Connect</button>
<button id="disconnect" disabled="disabled" onclick="disconnect();">Disconnect</button>
</div>
<div id="conversationDiv" style="overflow:auto">
<p id="response"></p>
</div>
</div>
有关发生了什么的信息：这是单向聊天系统（使用WebSockets），其中只有一方发送邮件。这是服务器端。所有的魔法发生在 function showGreeting（message）{..} 它正在创建元素和追加孩子，等等。我希望这可能没有什么帮助。
感谢
A little info on what's going on: It is a one way chat system (Using WebSockets) where only one side send messages. That is server side. All the magic is happening in function showGreeting(message) {..} where it is creating elements and appending child, etc. I hope this could be of little help. Thanks
推荐答案
你可以知道你是否像这样滚动到底部
You can figure out if you are scrolled to the bottom like this
var isScrolled = (element.scrollHeight - element.scrollTop === element.clientHeight);
那么：
if (isScrolled) {
//code here to move scrollbar down
}
b $ b
https://developer.mozilla.org / en-US / docs / Web / API / Element / scrollHeight
这篇关于将滚动保持在底部，除非用户更改滚动的位置的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
