Php+xml combined with Ajax to achieve a complete example of point-praise function _php Skills

The example of this article describes the method of Php+xml combining Ajax to realize the point-praise function. Share to everyone for your reference. Specifically as follows:

Use XML, PHP, and Ajax to implement the point-and-click functionality without the need to link the database, use PHP to modify the content of the XML, and use Ajax to directly or possibly XML content.

One, ready xml:

<?xml version= "1.0"?> 
<goodtree> 
  <goodnode> 
    <id>0</id> 
    <count >17</count> 
  </goodnode> 
  <goodnode> 
    <id>1</id> 
    <count>37 </count> 
  </goodnode> 
  <goodnode> 
    <id>2</id> 
    <count>67 </count> 
  </goodnode>   
</goodtree>

Where the ID is only used to see the clear sort, there is no actual invocation effect.

Second, prepare the HTML.

<div id= "Goodcount" >
  <span>0</span><button onclick= "goodplus (0);" >good+1</button>
  <span>0</span><button onclick= "Goodplus (1);" >good+1</button>
  <span>0</span><button onclick= "Goodplus (2);" >good+1</button>
  <span>0</span><button onclick= "Goodplus (3);" >good+1</button>
</div>

Third, JAVASCRIPT includes Ajax, but also added the ability to judge cookies

var span = document.getElementsByTagName (' span '); 
var num; 

var flag = 0;   
for (var i = 1; i < span.length + 1; i++) {senddata (i); 
    function Goodplus (gindex) {flag = 1; 
    num = parseint (Span.item (gindex). InnerHTML); 
      if (Checkcookie (gindex) = = true) {num = num + 1; 
    SendData (Gindex); }else{alert ("You've been lit!") 
    ')} function SendData (aindex) {var xmlhttp; 
    var txt; if (window. 
    XMLHttpRequest) {xmlhttp=new XMLHttpRequest (); 
    }else{xmlhttp=new ActiveXObject ("Microsoft.XMLHTTP"); 
        } xmlhttp.onreadystatechange=function () {if (xmlhttp.readystate = = 4 && xmlhttp.status = 200) { 
          if (flag = = 0) {xmldoc = Xmlhttp.responsexml; 
          var count = xmldoc.getelementsbytagname (' count '); 
          var span2 = document.getelementsbytagname (' span '); for (var j = 0; J < Count.length J + +) {Span2.item (j). InnerHTML = Count[j].childnodes[0].nodevaLue 
          }}else if (flag = = 1) {xmldoc2 = Xmlhttp.responsetext; 
          var span3 = document.getelementsbytagname (' span '); 
        Span3.item (aindex). InnerHTML = XMLDOC2; 
    }} if (flag = 0) {xmlhttp.open ("get", "/ajax/foodmap/index.xml");   
    }else{Xmlhttp.open ("Get", "/ajax/foodmap/index.php?num=" + num + "&aindex=" + aindex,true); 
} xmlhttp.send (); 
    //Determine if there is already a cookie function Checkcookie (gindex) {var Thiscookie = ' sdcity_foodmap_goodplus ' + gindex; 
    var Mapcookie = GetCookie (Thiscookie) if (mapcookie!=null && mapcookie!= "") {return false; 
      }else {Setcookie (thiscookie,thiscookie,365); 
    return true; 
    }//Get Cookie function GetCookie (c_name) {//Get cookie, parameter is name. 
      if (Document.cookie.length > 0) {//When the cookie is not empty, start looking for the name C_start = document.cookie.indexOf (c_name + "="); if (C_start!=-1) {//If the starting position is not-1 is to find, find and then determine the end of the bitPlacing C_start = C_start + c_name.length + 1; 
        The value of the cookie exists after the name and the equal sign, so the start position of the content should be plus length and 1 c_end = Document.cookie.indexOf (";", C_start); 
        if (c_end = = 1) {c_end = Document.cookie.length;
Return unescape (document.cookie.substring (C_start, c_end)); 
      Returns the content, decodes. 
} return ""; //Set Cookie function Setcookie (c_name,value,expiredays) {//Deposit name, value, validity period. Expiration event is today + valid days. 
    Then store cookies, var exdate=new Date (); Exdate.setdate (exdate.getdate () + expiredays) Document.cookie = c_name + "=" + Escape (value) + ((expiredays==null) ? "" : "; 

 Expires= "+ exdate.togmtstring ())}

Four, through PHP to modify the XML data, a start to call the XML data when the PHP file does not need.

<?php 
$num = $_get[' num ']; 
echo $_get[' num ']; 
$aindex = $_get[' Aindex ']; 
$dom =new DOMDocument (' 1.0 '); 
$dom->load (' index.xml '); 
$goodnode = $dom->getelementsbytagname (' Goodnode '); 
$goodnode = $goodnode->item ($aindex); 
$items = $goodnode->getelementsbytagname (' count '); 
foreach ($items as $a) { 
  $a->nodevalue = $_get[' num ']; 
} 
$dom->save (' index.xml '); 
? >

Complete.

I hope this article will help you with your PHP program design.