ajax 的學習
這幾天都在研究 ajax 的用法,AJAX全稱為「Asynchronous JavaScript and XML」（非同步JavaScript和XML），是指一種創建交互式網頁應用的網頁開發技術,最好的地方是向server提出需求,只要更新部分網頁內容,不用全部更新,並且server在處理時,client也可以動作,server處理完,自動更新,client不用等待,所以叫非同步,它必需有 dom,javascript,xml的基礎,對我來講有點難,看了幾篇教學,只大約有個概念,等那天故意用它寫個網頁程式試試...
下面好像是從 ibm 網站看來的例題,再加上自己的一點備註
<script language="javascript" type="text/javascript">
var request = false;
try
{ request = new XMLHttpRequest(); }
catch(trymicrosoft)
{
try
{ request = new ActiveXObject("Msxml2.XMLHTTP"); }
catch(othermicrosoft)
{
try
{ request = new ActiveXObject("Microsoft.XMLHTTP"); }
catch(failed)
{ request = false; }
}
}
if(!request)
alert("Error initializing XMLHttpRequest!");
function getCustomerInfo()
{
// Get 方式
var phone = document.getElementById("phone").value;
var url = "lookupCustomer.php?phone=" + escape(phone);
request.open("GET",url,true);
request.onreadystatechange = updatePage;
request.send(null);
/* Post 方式
var phone = document.getElementById("phone").value;
var url = "lookupCustomer.php";
request.onreadystatechange = updatePage;
request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
request.send("phone="+phone+"&item="+itemCode);
*/
}
function updatePage()
{
if(request.readyState == 4)
{
if(request.status == 200)
{
var response = request.responseText.split("|"); //server必須送回 "字串 | 字串 | ..."格式 ,如果是 php 用 echo 送回
document.getElementById("order").value = response[0];
document.getElementById("address").innerHTML = response[1].replace(/\n/g,"");
}
else
{ alert("Error: status code is " + request.status); }
}
}
</script>
<body>
<p><img src="breakneck-logo_4c.gif" alt="Break Neck Pizza" /></p>
<form action="POST">
<p>Enter your phone number:
<input type="text" size="14" name="phone" id="phone"
onChange="getCustomerInfo();" />
</p>
<p>Your order will be delivered to:</p>
<div id="address" ></div>
<p>Type your order in here:</p>
<p><textarea name="order" rows="6" cols="50" id="order"></textarea></p>
<p><input type="submit" value="Order Pizza" id="submit" /></p>
</form>
</body>
迴響
ajax 的學習 | 豬窩
Fortunately in the present society it is currently acceptable that folks will likely change careers and jobs
two or three times before they obtain something that they revel in, something that they are
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The three basic colors used by reproduction are cyan, magenta and yellow.
It was foreseen that this amount of 3D printers in homes and business establishments raises rapidly.
ajax 的學習 | 豬窩
Job hunters could also setup their very own account, upload their resume, and setup notifications.
Make any final announcements (for example, the subsequent webinar
in a very series). It was foreseen that the number of 3D printers in homes and business establishments increases rapidly.
ajax 的學習 | 豬窩
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A jealous spouse accocunts for various situations, develops them and
lives by them. Most of stay at home moms to
fulfill the challenge of starting a social network
website.
ajax 的學習 | 豬窩
This device also governs the flow of power through the photovoltaic
array on the grid and vice-versa. The three basic colors useful for reproduction are cyan, magenta and yellow.
Roughly equal amounts of the three primary colors give rise towards the perception of
white.
ajax 的學習 | 豬窩
This device also governs the flow of power from your photovoltaic array on the grid and vice-versa.
One other thing which you are required to take into account
is limiting access to the network, notably if you
take part in any sort of secure printing or if you've areas of the network which might be for secure files.
But Apple possesses his own idea about the way to
watch video, and possesses nothing to do with standards that anybody
else creates.