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Llo! Ajax!

Source: Internet
Author: User
Tags html page window
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Ajax to write your first AJAX program, use the asynchronous way to get text files to the server, and to display, first please prepare an HTML Web page:
    • Helloajaxex-1.html
<! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >
  <meta content= "text/html; Charset=big5 "http-equiv=" Content-type ">
  <title>hello! Ajax! Examples...</title>
  <script type= "Text/javascript" src= "Helloajaxex-1.js" ></script>
<body>

<center><input value= "Ajax Please"  type= "button" ></center>

</body>

This HTML page will get the JavaScript file, and then press the button to perform the Startrequest () function, as the JavaScript file looks like this:
    • Helloajaxex-1.html
var xmlHttp;

function Createxmlhttprequest () {
    if (window. XMLHttpRequest) {
        XmlHttp = new XMLHttpRequest ();
    }
    else if (window. ActiveXObject) {
        XmlHttp = new ActiveXObject ("Microsoft.XMLHTTP");
    }
}

function Startrequest () {
    Createxmlhttprequest ();
    Xmlhttp.onreadystatechange = Handlestatechange;
    Xmlhttp.open ("Get", "helloajaxex-1.txt");
    Xmlhttp.send (NULL);
}

function Handlestatechange () {
    if (xmlhttp.readystate = = 4) {
        if (Xmlhttp.status = = 200) {
            Alert ("Servo-response:" + Xmlhttp.responsetext);
        }
    }
}

In Startrequest () a xmlhttprequest is established, And out of sync please get helloajaxex-1.txt, which is simply a text message, and note that if you want to write Chinese, the text file must be stored as UTF8, and the HelloAjaxEx1.txt is written as follows:
    • HelloAjaxEx1.txt
This is a sync request response text

You can click on the link to see the results.

You can combine the DOM to display the response text you have obtained without using the conversation cube or the Refresh page, such as setting up a <div&gt in the Web:
    • Helloajaxex-2.html
<! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >
  <meta content= "text/html; Charset=big5 "http-equiv=" Content-type ">
  <title>hello! Ajax! Examples...</title>

  <script type= "Text/javascript" src= "Helloajaxex-2.js" ></script>
<body>

<center>
<input value= "Ajax Please"  type= "button" >
<br>
<div id= "Response" ></div>
</center>
</body>


And helloajaxex-2.js can be changed as follows:



 
    
 
  
       
   
    • Helloajaxex-2.js
      •  
  
    

 


var xmlHttp;

function Createxmlhttprequest () {
    if (window. XMLHttpRequest) {
        XmlHttp = new XMLHttpRequest ();
    }
    else if (window. ActiveXObject) {
        XmlHttp = new ActiveXObject ("Microsoft.XMLHTTP");
    }
}

function Startrequest () {
    Createxmlhttprequest ();
    Xmlhttp.onreadystatechange = Handlestatechange;
    Xmlhttp.open ("Get", "helloajaxex-2.txt");
    Xmlhttp.send (NULL);
}

function Handlestatechange () {
    if (xmlhttp.readystate = = 4) {
        if (Xmlhttp.status = = 200) {
            document.getElementById ("Response"). InnerHTML =
                Xmlhttp.responsetext;
        }
    }
}


Here's a simple example of using the innerHTML of a DOM object, and you can see the results by the link.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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