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PHP Instance-AJAX poll

Source: Internet
Author: User
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PHP Instance-AJAX Polls AJAX Polls

In the following example, we will demonstrate a voting program through which the poll results are displayed without refreshing the page.

Do you like PHP and AJAX? Example explanation-HTML page

When the user selects an option above, a function named "Getvote ()" is executed. This function is triggered by an "onclick" event.

The poll.html file code is as follows:

<HTML><Head><MetaCharSet= "Utf-8"><title>Beginner's Tutorial (runoob.com)</title><Script>functionGetvote (int) {  if(window. XMLHttpRequest) {//ie7+, Firefox, Chrome, Opera, Safari code executionXMLHTTP=NewXMLHttpRequest (); } Else {    //IE6, IE5 code executionXMLHTTP=NewActiveXObject ("Microsoft.XMLHTTP"); } Xmlhttp.onreadystatechange=function() {  if(Xmlhttp.readystate==4 &&Xmlhttp.status== $) {document.getElementById ("Poll"). InnerHTML=Xmlhttp.responsetext; }} xmlhttp.open ("GET","poll_vote.php?vote="+int,true); Xmlhttp.send ();}</Script></Head><Body><DivID= "Poll"><H3>Do you like PHP and AJAX?</H3><form>are:<inputtype= "Radio"name= "vote"value= "0"onclick= "Getvote (this.value)"><BR>No:<inputtype= "Radio"name= "vote"value= "1"onclick= "Getvote (this.value)"></form></Div></Body></HTML>

The Getvote () function performs the following steps:

    • Create a XMLHttpRequest Object
    • Create a function that executes when the server responds ready
    • Send a request to a file on the server
    • Note the parameter (q) added to the end of the URL (contains the contents of the drop-down list)
PHP file

The above server page that is called by JavaScript is a php file named "poll_vote.php":

<?PHP$vote=Htmlspecialchars($_request[' Vote ']);//get the data stored in the file$filename= "Poll_result.txt";$content=file($filename);//splitting data into arrays$array=Explode("||",$content[0]);$yes=$array[0];$no=$array[1];if($vote= = 0){  $yes=$yes+ 1;}if($vote= = 1){  $no=$no+ 1;}//Insert poll Data$insertvote=$yes."||".$no;$fp=fopen($filename, "W");fputs($fp,$insertvote);fclose($fp);?>Display:inline-block; background-color:green; width:<?php Echo (100*round ($yes/($no+$yes), 2);?>px; height:20px;"></span> <?phpEcho(100*round($yes/($no+$yes), 2); >% </td> </tr> <tr> <td> no:</td> <td> <span style= "Display:inline-block; background-color:red; width:<?php Echo (100*round ($no/($no+$yes), 2);?>px; height:20px;"></span> <?phpEcho(100*round($no/($no+$yes), 2); >% </td> </tr></table>

When the selected value is sent from JavaScript to a PHP file, it occurs:

    1. Get the contents of the "Poll_result.txt" file
    2. Put the contents of the file into a variable and add 1 to the selected variable
    3. Write the results to the "poll_result.txt" file
    4. Output a graphical poll result
Text file

The data from the voting program is stored in a text file (poll_result.txt).

The data it stores is as follows:

3| | 4

The first number indicates the number of votes for "Yes", and the second number indicates the number of votes for "No".

Note: Please remember to only allow your Web server to edit the text file. do not let other people gain access, except Web server (PHP).

PHP Instance-AJAX poll

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.

Related Keywords:
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