我正在製作一個應用程序,根據用戶查詢在單個頁面上顯示數千個項目。 我在這裏上傳了一個類似的代碼片段:YUI,Javascript:我如何優化此代碼片段以更快運行?
http://adiinviter.com/forums/stack/current.php
代碼段的文件是:
<html>
<head>
<style type="text/css">
.table_head_outer {
background-color: #7192a8;
padding: 0px;
width:100%;
font-weight:bold;
color:#ffffff;
clear:both;
border: 1px solid #5a7f97;
-moz-border-radius-topright: 5px;
-moz-border-radius-topleft: 5px;
-webkit-border-top-right-radius: 5px;
-webkit-border-top-left-radius: 5px;
}
.table_head_body {
padding: 3px 0px 3px 0px;
background: transparent;
text-align:left;
margin-left: 13px;
margin-right: 3px;
}
.table_body_outer {
border-top: 1px solid rgb(255, 255, 255);
background-color: rgb(255, 255, 255);
width:100%;
display:block;
border-bottom: 1px solid #c4c4c4;
border-left: 1px solid #c4c4c4;
border-right: 1px solid #c4c4c4;
}
.table_body {
padding: 5px;
background: transparent;
}
.overlayDiv {
position: absolute; width: 100%; height: 100%; left: 0px;
background-color: rgba(10, 10, 10, 0.3);
font-family: Verdana; z-index: 2000;
}
.popup_box {
position: relative; opacity: 1;
background-color: transparent;
border-width: 0px; border-style: solid; border-color: #C1B4B4;
border-radius: 5px; -moz-border-radius: 5px; -webkit-border-radius: 5px;
width: auto; height: auto; text-align: center;
}
#optContain { width: 890px; }
#contentBox {
text-align: center; vertical-align: middle;
}
#sectionHeader { text-align: left; padding: 5px; }
#sectionHeaderRight { padding:5px; text-align: right; }
.sectionFooter { padding: 5px 15px; text-align: right;}
.product_disp, .product_disp_clicked, .product_disp_hover {
padding: 6px; width: 250px; height: 50px;
margin: 5px; float: left; overflow: auto; cursor: pointer;
border-width: 1px; border-style: solid;
border-radius: 5px; -moz-border-radius: 5px; -webkit-border-radius: 5px;
}
.product_disp_clicked {
border-color: #700;
background-color: #e00;
}
.product_disp_hover {
border-color: #aaa;
}
.div_trail_img {
position: absolute; z-index: 2030; visibility: hidden;
border-width: 1px; border-style: solid; border-color: #ccc;
padding: 5px; background-color: #fff;
border-radius: 5px;-moz-border-radius: 5px;-webkit-border-radius: 5px;
}
.prodcuts_img { float:left;
margin-right: 5px;
height:50px; width:auto;
}
</style>
<script type="text/javascript">
function adi_onArrive(obj)
{
setTimeout(function() {
if(obj['data'] != null)
document.getElementById(obj['id']).innerHTML += obj['data'];
}, 0);
}
function putDimensions()
{
document.myForm.sHeight.value = window.screen.height;
document.myForm.sWidth.value = window.screen.width;
}
</script>
</head>
<body>
<div id="trail_img_div" class="div_trail_img" style="">
<img id="trail_img" src=""/>
</div>
<?php
if($_GET['num_products'] == "" && $_GET['get_products'] == "")
{
?>
<center>
<form action="" method="" onSubmit="return putDimensions();" name="myForm">
No. of Items : <input type="textbox" name="num_products" > <br /><br />
<input type="hidden" name="sHeight" value="">
<input type="hidden" name="sWidth" value="">
<input type="submit" name="get_products" value=" Get Products ">
</form>
</center>
<?php
}
else
{
?>
<script type="text/javascript">
//trail_img_div
//trail_img
function click_effect(myObj,event) // onclick
{
if(myObj.className == "product_disp_clicked")
{
myObj.className = "product_disp";
}
else if(myObj.className == "product_disp_hover")
{
myObj.className = "product_disp_clicked";
}
return true;
}
function show_img_trail(img_url,myObj) //on mousemove to div
{
if(myObj.className == 'product_disp') myObj.className = 'product_disp_hover';
document.getElementById('trail_img').src = img_url;
document.getElementById('trail_img_div').style.visibility = 'visible';
document.getElementById('trail_name').innerHTML = 'Name : '+myObj.getAttribute('tip');
}
function hide_img_trail(myObj) //onmouseout
{
trail_img_div = document.getElementById('trail_img_div');
trail_img_div.style.visibility = 'hidden';
//trail_img_div.setStyle('visibility','hidden');
if(myObj.className == 'product_disp_hover') myObj.className = 'product_disp';
}
function m_move(myObj)
{
if(myObj.className == 'product_disp') myObj.className = 'product_disp_hover';
}
function m_out(myObj)
{
if(myObj.className == 'product_disp_hover') myObj.className = 'product_disp';
}
function update_co_ords(event) // onmousemove to td
{
trail_img_div = document.getElementById('trail_img_div');
if(event.pageX != undefined){
trail_img_div.style.left = (event.pageX + 10)+ 'px';
trail_img_div.style.top = (event.pageY + 10)+ 'px';
}
else{
trail_img_div.style.left = (event.clientX + 10)+ 'px';
trail_img_div.style.top = (event.clientY + 10)+ 'px';
}
}
function toggle_all(event)
{
conts_container = document.getElementById('conts_contain');
divArr = conts_container.querySelectorAll('div.product_disp');
if(divArr.length == 0) //uncheck all
{
divArr = conts_container.querySelectorAll('div.product_disp_clicked');
for(i=0; i<divArr.length ; i++)
{
divArr[i].className = 'product_disp';
}
}
else // check all
{
for(i=0; i<divArr.length ; i++)
{
divArr[i].className = 'product_disp_clicked';
}
}
return false;
}
</script>
<table class="overlayDiv" id="popupBox">
<tr>
<td align="center" align="center" valign="middle" style="text-align:center;vertical-align:middle;padding: 10px;">
<center>
<div class="popup_box" align="center">
<center>
<table style="width: 870px; border: 1px solid #333;" class="" id="optContain">
<tr class="">
<td align="left">
<div class="table_head_outer" style="position:relative;">
<div class="table_head_body" id="sectionHeader"> Product Details </div>
</div>
</td>
</tr>
<tr>
<td align="center" class="table_body_outer" style="font-size: 10pt;text-align: center; vertical-align: middle; height: 500px;" id="contentBox">
<div style="padding: 10px;"> <a href="" onclick="return toggle_all(event);"> Select All </a> </div>
<div style="height: 500px;overflow: auto;" id="conts_contain" onmousemove="return update_co_ords(event);">
</div>
</td>
</tr>
<tr>
<td id="sectionFooter" align="right" style="background-color:#fff;">
<div align="center" style="margin: 5px 15px;">
<input type="button" class="button" name="struct_close" id="close_popup" value=" Add Now ">
</div>
</td>
</tr>
</table>
</center>
</div></center>
</td></tr>
</table>
<?php
// Code to caculate height and width
$width = $_GET['sWidth'];
$height = $_GET['sHeight'];
$sss = intval(($width - 130)/260);
$sss = $sss * 260;
echo '<script type="text/javascript">
conts_container = document.getElementById("conts_contain");
conts_container.style.width = "'.($sss + 120).'px";
document.getElementById("contentBox").style.width = "'.($sss + 150).'px";
conts_container.style.maxHeight = "'.($height - 150).'px";
</script>
';
flush();
// Code to Add items in contentBox
$arr = array('name' => 'Product_', 'id' => 10);
$status = 'Available';
for($i = 1; $i <= $_GET['num_products'] ; $i++)
{
$someVar .= '<div class="product_disp"
onclick="return click_effect(this,event);"
onmousemove="return show_img_trail(\'pic.jpg\',this);"
onmouseout="return hide_img_trail(this);" align="left" > <img src="pic.jpg" class="prodcuts_img"/>
<span style="overflow:hidden;" align="left"> <b> product_'.$i.' </b> <br/>
id : '.rand(0,10000).' <br /></span>
<span style="padding:0px;width: 100%;" align="right">'.$status.' </span>
</div>';
if($i % 100 == 0)
{
$output = array('id' => 'conts_contain', 'data' => $someVar);
echo '<script type="text/javascript"> adi_onArrive('.json_encode($output).'); </script>';
$someVar = '';
}
}
if($someVar != '')
{
$output = array('id' => 'conts_contain', 'data' => $someVar);
echo '<script type="text/javascript"> adi_onArrive('.json_encode($output).'); </script>';
$someVar = '';
}
}
?>
</body>
</html>
流量: 的PHP文件中首先顯示空結構,並釋放輸出緩衝區。這將在客戶端瀏覽器中快速顯示沒有任何項目的結構 。然後,PHP文件發送一些 javascript funciton調用來添加框中的項目(每次300個)。
請考慮在代碼中的任何優化或變化,這將有助於使其運行速度更快 和解決以下問題
代碼慢滾動:當數以千計的物品裝入箱中,變得非常緩慢地滾動 頁面。我想知道是否有任何優化/代碼更改或任何其他並行方法到 克服這個問題。
彈出容器窗口的自動調整大小,通過在所有邊上留下某些填充 以最好地適應可變屏幕大小。我希望能在YUI中做到最好。下面是我正在計算和調整窗口 目前
$width = $_GET['sWidth']; $height = $_GET['sHeight']; $sss = intval(($width - 130)/260); // 260 is the width of one item including paddings $sss = $sss * 260; echo '<script type="text/javascript"> conts_container = document.getElementById("conts_contain"); conts_container.style.width = "'.($sss + 120).'px"; document.getElementById("contentBox").style.width = "'.($sss + 150).'px"; conts_container.style.maxHeight = "'.($height - 150).'px"; </script>';
選擇全部作品相當。有沒有其他更好的方法來加速使用YUI?這裏是它的 如何目前的工作:
function toggle_all(event) { conts_container = document.getElementById('conts_contain'); divArr = conts_container.querySelectorAll('div.product_disp'); if(divArr.length == 0) //uncheck all { divArr = conts_container.querySelectorAll('div.product_disp_clicked'); for(i=0; i<divArr.length ; i++) { divArr[i].className = 'product_disp'; } } else // check all { for(i=0; i<divArr.length ; i++) { divArr[i].className = 'product_disp_clicked'; } } return false; }
我也用Facebook的喜歡那個頁面管線數據上bigPipe的概念,但我不知道如果 我在做它的儀式。我的意思是我在該頁面上加載了數千個項目數據,所以我認爲它可以被分解爲更多結構化的東西。我真的很想知道我怎樣才能讓它變得更快更快,並且高度優化以提高性能。