Json_encode返回字符串而不是对象

时间:2016-06-07 05:51:00

标签: javascript php jquery json ajax

我有一个php文件,对数据进行一些操作,然后以json格式发送数据(据说)。

然后我使用ajax在js文件中接收数据。这是一个跨域操作,然后我需要使用jsonp。

问题是我收到了错误

  

对象{readyState:4,状态:200,statusText:“成功”}   parsererror - 错误:jQuery1123030211047915085665_1465277732410原为   没有叫(...)

我认为这是因为我没有收到数据作为json对象,而是作为一个简单的字符串(当我将数据类型从jsonp更改为文本时,它转到.done块)。

如何将数据作为json对象接收,而不是简单的字符串?

代码:

PHP:

if ( $moeda ==='SEK' ){

 foreach($result as $r){ //$result is an array with the result of a sql query

//here I do some verifications, that depending on the circunstance, calculate and replace 
//the value of the $r['price'] field.

    if($r['currency'] === "SEK"){
        $valor = $r['tprice'];
        $r['tprice'] = number_format($valor,2,'.','');

    }else if ($r['currency'] === "BRL"){
        $dat = $r['emissao'];
        $valor = $r['tprice'];  
        $r['tprice'] = number_format( ( converteBRL_SEK($dat,$valor) ) ,2,'.','');


    }else if ($r['currency'] === "USD"){
        $dat = $r['emissao'];
        $valor = $r['tprice'];
        $r['tprice'] = number_format(( converteUSD_SEK($dat,$valor) ),2,'.','');     

    }else if ($r['currency'] === "EUR"){
        $dat = $r['emissao'];
        $valor = $r['tprice'];
            $r['tprice'] = number_format(( converteEUR_SEK($dat,$valor) ),2,'.','');    

    }
    else{
        echo 'error';
    }
$retorno['dados'] = $r;   
// using the GET callback because I'm using jsonp.
echo $_GET['callback'] . '('.json_encode($retorno,JSON_PRETTY_PRINT).')'; 


}

修改 我忘了发布javascript代码,这里是:

代码:

function buildTableDetail(p_sts,p_ar){  
    $('#tb_detail').empty();
    return $.ajax({
       type:'GET',
       crossDomain:true,
       url:'http://localhost/files/montar_detail_local.php?callback=?',// I use a real url, localhost just for the example
       dataType:'jsonp',
       data: {area:p_ar,
              st:p_sts},
       beforeSend: function(){
       $('#t_detail').css('opacity','1.0');  
           console.log(p_ar);
        console.log(p_sts);
       }    


    }).done(function(data){
        //after I get the data, I build a table, and format some values here...
         $('#tb_detail').empty();

         console.log("AREA:"+p_ar);
         for (i = 0; i < data.dados.length; i++) { 
             $('#tb_detail').append('<tr> <td>'+data.dados[i].proposal+
                                    '</td><td class="h_detail old_no" >'+data.dados[i].old_no+
                                    '</td><td class="h_detail emissao" style="white-space: nowrap;">'+data.dados[i].emissao+
                                    '</td><td class="h_detail area">'+data.dados[i].area+
                                    '</td><td class="h_detail country">'+data.dados[i].country+
                                    '</td><td class="h_detail ec_name">'+data.dados[i].ec_name+
                                    '</td><td class="h_detail distributo">'+data.dados[i].distributo+
                                    '</td><td class="h_detail project">'+data.dados[i].project+
                                    '</td><td>'+float2moeda(data.dados[i].tprice)+
                                    '</td><td class="h_detail gm">'+data.dados[i].gm+
                                    '</td><td >'+data.dados[i].prob+
                                    '</td><td class="h_detail st">'+(data.dados[i].st).substr(0,1)+'</td></tr>');


                console.log(data.dados[i].proposal);
                console.log(data.dados[i].distributo);
            }
})
.fail(function(data, textStatus, errorThrown){
        alert("Erro na operação.");
        console.log(data);
        console.log(textStatus);
        console.log(errorThrown);
     })

}

EDIT2:

刚刚更新了这一行:

echo $_GET['callback'] . '('.json_encode($retorno,JSON_PRETTY_PRINT).')'; 

到这个

echo $_GET['callback'] . '('.json_encode($retorno,JSON_PRETTY_PRINT).');'; 

并且错误不再显示。但是,它没有进入for循环,也没有显示任何数据。我使用了console.log(data.dados.lenght)并且它向我返回'undefined',所以我无法循环。

有什么想法吗?

3 个答案:

答案 0 :(得分:2)

JSON只不过是一个字符串。如果您使用jQuery将json字符串转换为对象,请在javascript中使用$ .parseJSON。

答案 1 :(得分:1)

尝试以下方法:

  if ( $moeda ==='SEK' ){

 foreach($result as $r){ //$result is an array with the result of a sql query

//here I do some verifications, that depending on the circunstance, calculate and replace 
//the value of the $r['price'] field.

    if($r['currency'] === "SEK"){
        $valor = $r['tprice'];
        $r['tprice'] = number_format($valor,2,'.','');

    }else if ($r['currency'] === "BRL"){
        $dat = $r['emissao'];
        $valor = $r['tprice'];  
        $r['tprice'] = number_format( ( converteBRL_SEK($dat,$valor) ) ,2,'.','');


    }else if ($r['currency'] === "USD"){
        $dat = $r['emissao'];
        $valor = $r['tprice'];
        $r['tprice'] = number_format(( converteUSD_SEK($dat,$valor) ),2,'.','');     

    }else if ($r['currency'] === "EUR"){
        $dat = $r['emissao'];
        $valor = $r['tprice'];
            $r['tprice'] = number_format(( converteEUR_SEK($dat,$valor) ),2,'.','');    

    }
    else{
        echo 'error';
    }
$retorno['dados'][] = $r;   //append to the array

}
   // using the GET callback because I'm using jsonp.
echo $_GET['callback'] . '('.json_encode($retorno,JSON_PRETTY_PRINT).');'; //echo the valid call of the callback 

答案 2 :(得分:0)

尝试使用JSON_FORCE_OBJECT代替JSON_PRETTY_PRINT

像这样的东西。

echo $_GET['callback'] . '('.json_encode($retorno,JSON_FORCE_OBJECT).')';