May 2005
Beginner
336 pages
10h 14m
English
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Working on the Client Side
The Sum web part performs its calculations on the server, but that's not really necessary or efficient. For high-volume applications, it's a good idea to do as much work on the client side as possible. For example, the following HTML creates an equivalent client-side web part that doesn't require a roundtrip to the server to perform the calculations:
<html>
<head>
<script id="clientEventHandlersJS" language="javascript">
function _btn_onclick() {
var arr = new Array("");
// Use getElementById, direct control refs don't work
var _txt = document.getElementById("_txt");
var _div = document.getElementById("_div");
var total = 0, s = _txt.value;
arr = s.split("\n");
for (var i in arr)
{
total += parseFloat(arr[i]);
}
_div.innerText = "Total: " + total;
return;
}
</script>
</head>
<body>
<form id="_frm">
<div id="_div">Total:
</div>
<TEXTAREA id="_txt" name="_txt" rows="10" cols="35">
</TEXTAREA>
<br>
<INPUT id="_btn" type="button" value="Sum"
onclick="return _btn_onclick()"> </form>
</body>
</html>This code is stored as an HTM file in a resource, then loaded and rendered by the following line:
' See "Creating Web Part Appearance" for GetHtml() code.
output.Write(GetHtml("clientSum.htm")At runtime this web part is visually identical to the server-side web part in Figure 9-8, but the calculation is done on the client computer via JavaScript. The result is much better performance and less network traffic, since the page isn't sent back to the server every time ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.