When it comes to creating a chat window that scrolls, would you recommend using an iframe or a scrollable div? What advantages and disadvantages do each technique offer? Ultimately, which option would you choose and what is your reasoning behind it? Thank you
You have the ability to develop a script that can integrate a chat feature into a third-party website using either <div> or <iframe> elements.
iframe
DIV
Ultimately, the choice between <div> and <iframe> depends on your specific requirements.
Witness this technique in action
HTML:
<div class="chat">
<div class="messages">
<div>Old message</div>
</div>
<textarea></textarea>
<button>Post</button>
</div>
BASIC CSS (additional styles available in demo):
.chat{
position:relative;
margin:0 auto;
width:300px;
overflow:hidden;
}
.chat .messages{
width:100%;
height:300px;
overflow:hidden;
}
.chat .messages:hover{
overflow-y:scroll;
}
.chat .messages > div{
padding:15px;
border-bottom:1px dashed #999;
}
jQuery:
var $chat = $('.chat'),
$printer = $('.messages', $chat),
$textArea = $('textarea', $chat),
$postBtn = $('button', $chat),
printerH = $printer.innerHeight(),
preventNewScroll = false;
// SCROLL TO BOTTOM FUNCTION
function scrollBottom(){
if(!preventNewScroll){
$printer.stop().animate( {scrollTop: $printer[0].scrollHeight - printerH }, 600);
}
}
scrollBottom();
function postMessage(e){
if(e.type=='click' || (e.which==13 && !e.shiftKey)){
e.preventDefault();
var msg = $textArea.val();
if($.trim(msg)){
$printer.append('<div>'+ msg.replace(/\n/g,'<br>') +'</div>');
$textArea[0].value='';
scrollBottom();
// AJAX call to post the message
}
}
}
// PREVENT AUTO-SCROLL WHILE READING OLD MESSAGES
$printer.hover(function(e) {
preventNewScroll = e.type=='mouseenter' ? true : false ;
if(!preventNewScroll){ scrollBottom(); }
});
$postBtn.click(postMessage);
$textArea.keyup(postMessage);
// TEST ONLY - SIMULATE NEW MESSAGES
var i = 0;
intv = setInterval(function() {
$printer.append("<div>Message ... "+ (++i) +"</div>");
scrollBottom();
},2000);
When it comes to a chat application, my preference is always for using a div over an iframe.
One key advantage of using a div is the ability to handle events that cannot be handled within an iframe. Try experimenting with events like click and mouseover inside an iframe - you'll find that they are unresponsive.
$('div').click(function () {
alert('Div was clicked!');
}
Unlike iframes, a div allows access to events on its child elements, providing more flexibility for handling and coding as needed. Iframes require event handling within the iframe itself, making it more cumbersome.
$('iframe').click(function () {
// code..this will execute when click is on iframe, not for a child
}
Furthermore, manipulating elements within a div is simpler as compared to iframes. A chat app benefits greatly from being able to manage all element events effectively.
<div>
Some text
</div>
In a div, updating content through ajax requests and scrolling using jQuery API can be seamlessly implemented, regardless of page size.
$('div').load('chat_page.php'); // load a page in the div
On the other hand, iframes are best suited for sharing functionality without exposing code, such as embedding a chat application in a third-party site.
Regarding scrolling techniques, utilizing the scrollTo function on a div can achieve the desired effect.
$('div').scrollTo(10); // scroll 10px down..
As for browser support, both jQuery and HTML have excellent cross-browser compatibility.
http://jquery.com/browser-support/ For more information on browser support.
Personally, I find using div elements to be advantageous due to the ease of managing them and their ability to be refreshed without consuming excessive server data. This is just my personal preference.
The benefits of using divs include minimal data usage, flexibility in placement, and the versatility to repurpose data for various tasks on a webpage.
On the other hand, iframes are easier to set up and code, offering standalone functionality. However, accessing data within iframes can be challenging and may require additional coding compared to div elements.
The drawbacks of iframes lie in the complexity of accessing data within them, while divs necessitate careful styling of css and code to ensure proper flow across parent and child elements.
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