简单的汇率转换工具---初试AJAX

本文介绍了一款基于AJAX技术的简易汇率转换工具。通过选择不同货币并点击按钮即可实时获取转换结果。该工具利用PHP进行后台处理,并调用API获取最新汇率。

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简单的汇率转换工具—初试AJAX

今天自己折腾了一个简单的汇率转换工具,顺便简单的学习了一下AJAX技术,在这里做个记录,以便自己以后查询。废话不多说,直接上代码:
convert.php文件内容:

 <!DOCTYPE html>    
<html>    
<head>    
<meta charset="utf-8">    
<title>汇率转换</title>    
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=0">     
</head>    
<body ontouchstart="">    
<div class="wxapi_container">    
<div class="wxapi_index_container">    
<table>
<tr>
<td>从:</td>
<td>
<select id="select1">
  <option value="USD" selected = "selected">美元</option>
  <option value="EUR">欧元</option>
  <option value="GBP">英镑</option>
  <option value="AUD">澳元</option>
  <option value="CAD">加元</option>
  <option value="HKD">港元</option>
  <option value="CNY">人民币</option>
</select>
</td> 
</tr>
<tr>
<td>到:</td>
<td>
<select id="select2">
  <option value="USD">美元</option>
  <option value="EUR">欧元</option>
  <option value="GBP">英镑</option>
  <option value="AUD">澳元</option>
  <option value="CAD">加元</option>
  <option value="HKD">港元</option>
  <option value="CNY" selected = "selected">人民币</option>
</select>
</td> 
</tr>
<tr>
<td></td>
<td><input type="button" value="转换" onclick="convert()"></td> 
</tr>
 <tr>
<td>结果:</td>
<td><input type="text" id="result" value="0" readonly="true"></td>
</tr>
</table>
</div>     
</div>    
</body>    
<script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>   
<script>    
/** 
* 普通Ajax的完整访问过程 
*/ 
var xmlHttp 

function convert()//登录转换点击后执行这个方法 
{ 
    var select1=document.getElementById("select1").value; 
    var select2=document.getElementById("select2").value; 
    if (select1 == select2 )//不能从人民币转换为人民币
    { 
        document.getElementById("result").value="请选择不同的货币单位";
        return 
    } 
    xmlHttp=GetXmlHttpObject() 
    if (xmlHttp==null) 
    { 
        alert ("Browser does not support HTTP Request") 
        return 
    } 
    var url="change.php"//设置要提交action到后台的那个处理请求的文件名 
    url=url+"?scur="+select1+"&tcur="+select2//为这个路径加上参数
    url=url+"&sid="+Math.random()//为这个路径加上一个随机数 
    xmlHttp.onreadystatechange=stateChanged//每当 readyState 改变时,就会触发 onreadystatechange 事件,readyState 属性存有 XMLHttpRequest 的状态信息 
    xmlHttp.open("GET",url,true)//定义请求的参数 
    xmlHttp.send(null)//发送请求 
} 

function stateChanged() 
{ 
    if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
    //0: 请求未初始化 
    //1: 服务器连接已建立 
    //2: 请求已接收 
    //3: 请求处理中 
    //4: 请求已完成,且响应已就绪 
    { 
        var a= xmlHttp.responseText;//把相应数据赋值给a 
        var resultinput=document.getElementById("result"); 
        resultinput.value = a;
    } 
} 

function GetXmlHttpObject() 
{ 
    var xmlHttp=null; 
    try 
    { 
        // Firefox, Opera 8.0+, Safari 
        xmlHttp=new XMLHttpRequest(); 
    } 
    catch (e) 
    { 
        // Internet Explorer 
        try 
        { 
            xmlHttp=new ActiveXObject("Msxml2.XMLHTTP"); 
        } 
        catch (e) 
        { 
            xmlHttp=new ActiveXObject("Microsoft.XMLHTTP"); 
        } 
    } 
    return xmlHttp; 
}    
</script>     
</html>

change.php文件内容如下:

<?php  

//header("Content-Type:text/html;charset=UTF-8");  
function nowapi_call($a_parm){  
    if(!is_array($a_parm)){  
        return false;  
    }  
    //combinations  
    $a_parm['format']=empty($a_parm['format'])?'json':$a_parm['format'];  
    $apiurl=empty($a_parm['apiurl'])?'http://api.k780.com:88/?':$a_parm['apiurl'].'/?';  
    unset($a_parm['apiurl']);  
    foreach($a_parm as $k=>$v){  
        $apiurl.=$k.'='.$v.'&';  
    }  
    $apiurl=substr($apiurl,0,-1);  
    if(!$callapi=file_get_contents($apiurl)){  
        return false;  
    }  
    //format  
    if($a_parm['format']=='base64'){  
        $a_cdata=unserialize(base64_decode($callapi));  
    }elseif($a_parm['format']=='json'){  
        if(!$a_cdata=json_decode($callapi,true)){  
            return false;  
        }  
    }else{  
        return false;  
    }  
    //array  
    if($a_cdata['success']!='1'){  
        echo $a_cdata['msgid'].' '.$a_cdata['msg'];  
        return false;  
    }  
    return $a_cdata['result'];  
}  

//$nowapi_parm['app']='finance.rate';  
//$nowapi_parm['scur']='GBP';  
//$nowapi_parm['tcur']='CNY';  
///$nowapi_parm['appkey']='10003';  
//$nowapi_parm['sign']='b59bc3ef6191eb9f747dd4e83c99f2a4';  
//$nowapi_parm['format']='json';  
//if(!$result=nowapi_call($nowapi_parm)){  
//    die('fail');  
//}  
//var_dump($result);  
//print_r($result);  
//echo "   scur : ".$result['scur']."<br>";  
//echo "   tcur : ".$result['tcur']."<br>";  
//echo " ratenm : ".$result['ratenm']."<br>";  
//echo "   rate : ".$result['rate']."<br>";  
//echo " update : ".$result['update']."<br>";  




function convert($scur,$tcur){
    $nowapi_parm['app']='finance.rate';  
    $nowapi_parm['scur']= $scur;  
    $nowapi_parm['tcur']= $tcur;  
    $nowapi_parm['appkey']='10003';  
    $nowapi_parm['sign']='b59bc3ef6191eb9f747dd4e83c99f2a4';  
    $nowapi_parm['format']='json';
    if(!$result=nowapi_call($nowapi_parm)){  
        return "转换失败!";
    }
    else{
        return $result['rate'];
    }  
}

$scur=$_GET["scur"]; 
$tcur=$_GET["tcur"]; 
//file_put_contents("./test.txt", "scur = " . $scur . "\n", FILE_APPEND);
//file_put_contents("./test.txt", "tcur = " . $tcur . "\n", FILE_APPEND);
//file_put_contents("./test.txt", "result = " . convert($scur,$tcur) . "\n", FILE_APPEND);
echo convert($scur,$tcur);

?>  

简单的效果图如下:

这里写图片描述

<option value="AED">United Arab Emirates Dirham (AED)</option> <option value="ANG">Netherlands Antillean Guilder (ANG)</option> <option value="ARS">Argentine Peso (ARS)</option> <option value="AUD">Australian Dollar (AUD)</option> <option value="BDT">Bangladeshi Taka (BDT)</option> <option value="BGN">Bulgarian Lev (BGN)</option> <option value="BHD">Bahraini Dinar (BHD)</option> <option value="BND">Brunei Dollar (BND)</option> <option value="BOB">Bolivian Boliviano (BOB)</option> <option value="BRL">Brazilian Real (BRL)</option> <option value="BWP">Botswanan Pula (BWP)</option> <option value="CAD">Canadian Dollar (CAD)</option> <option value="CHF">Swiss Franc (CHF)</option> <option value="CLP">Chilean Peso (CLP)</option> <option value="CNY">Chinese Yuan (CNY)</option> <option value="COP">Colombian Peso (COP)</option> <option value="CRC">Costa Rican Colón (CRC)</option> <option value="CZK">Czech Republic Koruna (CZK)</option> <option value="DKK">Danish Krone (DKK)</option> <option value="DOP">Dominican Peso (DOP)</option> <option value="DZD">Algerian Dinar (DZD)</option> <option value="EEK">Estonian Kroon (EEK)</option> <option value="EGP">Egyptian Pound (EGP)</option> <option value="EUR">Euro (EUR)</option> <option value="FJD">Fijian Dollar (FJD)</option> <option value="GBP">British Pound Sterling (GBP)</option> <option value="HKD">Hong Kong Dollar (HKD)</option> <option value="HNL">Honduran Lempira (HNL)</option> <option value="HRK">Croatian Kuna (HRK)</option> <option value="HUF">Hungarian Forint (HUF)</option> <option value="IDR">Indonesian Rupiah (IDR)</option> <option value="ILS">Israeli New Sheqel (ILS)</option> <option value="INR">Indian Rupee (INR)</option> <option value="JMD">Jamaican Dollar (JMD)</option> <option value="JOD">Jordanian Dinar (JOD)</option> <option value="JPY">Japanese Yen (JPY)</option> <option value="KES">Kenyan Shilling (KES)</option> <option value="KRW">South Korean Won (KRW)</option> <option value="KWD">Kuwaiti Dinar (KWD)</option> <option value="KYD">Cayman Islands Dollar (KYD)</option> <option value="KZT">Kazakhstani Tenge (KZT)</option> <option value="LBP">Lebanese Pound (LBP)</option> <option value="LKR">Sri Lankan Rupee (LKR)</option> <option value="LTL">Lithuanian Litas (LTL)</option> <option value="LVL">Latvian Lats (LVL)</option> <option value="MAD">Moroccan Dirham (MAD)</option> <option value="MDL">Moldovan Leu (MDL)</option> <option value="MKD">Macedonian Denar (MKD)</option> <option value="MUR">Mauritian Rupee (MUR)</option> <option value="MVR">Maldivian Rufiyaa (MVR)</option> <option value="MXN">Mexican Peso (MXN)</option> <option value="MYR">Malaysian Ringgit (MYR)</option> <option value="NAD">Namibian Dollar (NAD)</option> <option value="NGN">Nigerian Naira (NGN)</option> <option value="NIO">Nicaraguan Córdoba (NIO)</option> <option value="NOK">Norwegian Krone (NOK)</option> <option value="NPR">Nepalese Rupee (NPR)</option> <option value="NZD">New Zealand Dollar (NZD)</option> <option value="OMR">Omani Rial (OMR)</option> <option value="PEN">Peruvian Nuevo Sol (PEN)</option> <option value="PGK">Papua New Guinean Kina (PGK)</option> <option value="PHP">Philippine Peso (PHP)</option> <option value="PKR">Pakistani Rupee (PKR)</option> <option value="PLN">Polish Zloty (PLN)</option> <option value="PYG">Paraguayan Guarani (PYG)</option> <option value="QAR">Qatari Rial (QAR)</option> <option value="RON">Romanian Leu (RON)</option> <option value="RSD">Serbian Dinar (RSD)</option> <option value="RUB">Russian Ruble (RUB)</option> <option value="SAR">Saudi Riyal (SAR)</option> <option value="SCR">Seychellois Rupee (SCR)</option> <option value="SEK">Swedish Krona (SEK)</option> <option value="SGD">Singapore Dollar (SGD)</option> <option value="SKK">Slovak Koruna (SKK)</option> <option value="SLL">Sierra Leonean Leone (SLL)</option>
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