Question

我正在使用Codeigniter和Jquery和AJAX方法从我的数据库中的两个表中查询数据，并使用表cat中的select group with select join。

这是表格描述

表1： cat

======c_id======fk_group_id====cat_name===
======1========1==============cat1=======
======2========1==============cat2=======
======3========1==============cat3=======
======4========1==============cat4=======

表2： cat_group 。

======gid=======gname====gstat============
======1========1=========1==============
======2========1=========1==============
======3========1=========1==============
======4========1=========1==============

这是我的型号：

此函数将从表cat_group连接与gid = cat.fk_group_id上的表Cat联系。

public function cat(){

    $this->db->select('cat_group.*, cat.*');
    $this->db->from('cat_group');
    $this->db->join('cat', 'cat.fk_group_id = cat_group.gid','all')->where('cat_group.gstatus = 1');
    return $this->db->get()->result();
}

我的功能在控制器： 我从Model调用方法cat并将数据作为Json_encode回显到客户端浏览器

public function select_cat_by_group(){
    $this->load->model("main/slide_cat_m");
    $val = $this->slide_cat_m->cat();
    if(!$val){
        return false;
    }else{
       echo json_encode($val);
    }
}

Jquery Ajax

 $.ajax({
     method: "GET",
     url: '<?PHP echo base_url('main/select_cat_by_group');?>',
     dataType: "Json",
     success: function (data) {
           $.each(data, function (i, val) {
              if(val.fk_group_id = gid){
                    //I want to select all the rows in table cat where  fk_groupd_id = gid of table cat_group but I can't 
              }
           });
     }
 })

我的Json

[{"gid":"1","gtype":"1","g_name":"a","gstatus":"1","gad_stat":"1","gsrc":"asset\/img\/cat\/","gimg":"cat_ads.jpg","c_id":"1","fk_group_id":"1","cat_name":"fuck1","c_status":"1","type_for_group":"1","img":"9.jpg","src":"asset\/img\/main"},{"gid":"5","gtype":"2","g_name":"a","gstatus":"1","gad_stat":"0","gsrc":"asset\/img\/cat\/","gimg":"cat_ads.jpg","c_id":"5","fk_group_id":"5","cat_name":"cat_name","c_status":"1","type_for_group":"2","img":"9.jpg","src":"asset\/img\/main"},{"gid":"5","gtype":"2","g_name":"a","gstatus":"1","gad_stat":"0","gsrc":"asset\/img\/cat\/","gimg":"cat_ads.jpg","c_id":"6","fk_group_id":"5","cat_name":"cat_name","c_status":"1","type_for_group":"1","img":"9.jpg","src":"asset\/img\/main"},{"gid":"5","gtype":"2","g_name":"a","gstatus":"1","gad_stat":"0","gsrc":"asset\/img\/cat\/","gimg":"cat_ads.jpg","c_id":"7","fk_group_id":"5","cat_name":"cat_name","c_status":"1","type_for_group":"1","img":"9.jpg","src":"asset\/img\/main"},{"gid":"5","gtype":"2","g_name":"a","gstatus":"1","gad_stat":"0","gsrc":"asset\/img\/cat\/","gimg":"cat_ads.jpg","c_id":"8","fk_group_id":"5","cat_name":"cat_name","c_status":"1","type_for_group":"1","img":"9.jpg","src":"asset\/img\/main"},{"gid":"6","gtype":"1","g_name":"a","gstatus":"1","gad_stat":"1","gsrc":"asset\/img\/cat\/","gimg":"cat_ads.jpg","c_id":"9","fk_group_id":"6","cat_name":"cat_name","c_status":"1","type_for_group":"1","img":"9.jpg","src":"asset\/img\/main"},{"gid":"6","gtype":"1","g_name":"a","gstatus":"1","gad_stat":"1","gsrc":"asset\/img\/cat\/","gimg":"cat_ads.jpg","c_id":"10","fk_group_id":"6","cat_name":"cat_name","c_status":"1","type_for_group":"1","img":"9.jpg","src":"asset\/img\/main"},{"gid":"6","gtype":"1","g_name":"a","gstatus":"1","gad_stat":"1","gsrc":"asset\/img\/cat\/","gimg":"cat_ads.jpg","c_id":"15","fk_group_id":"6","cat_name":"cat_name","c_status":"1","type_for_group":"1","img":"9.jpg","src":"asset\/img\/main"},{"gid":"6","gtype":"1","g_name":"a","gstatus":"1","gad_stat":"1","gsrc":"asset\/img\/cat\/","gimg":"cat_ads.jpg","c_id":"16","fk_group_id":"6","cat_name":"cat_name","c_status":"1","type_for_group":"1","img":"9.jpg","src":"asset\/img\/main"},{"gid":"6","gtype":"1","g_name":"a","gstatus":"1","gad_stat":"1","gsrc":"asset\/img\/cat\/","gimg":"cat_ads.jpg","c_id":"17","fk_group_id":"6","cat_name":"cat_name","c_status":"1","type_for_group":"1","img":"9.jpg","src":"asset\/img\/main"},{"gid":"6","gtype":"1","g_name":"a","gstatus":"1","gad_stat":"1","gsrc":"asset\/img\/cat\/","gimg":"cat_ads.jpg","c_id":"18","fk_group_id":"6","cat_name":"cat_name","c_status":"1","type_for_group":"1","img":"9.jpg","src":"asset\/img\/main"},{"gid":"6","gtype":"1","g_name":"a","gstatus":"1","gad_stat":"1","gsrc":"asset\/img\/cat\/","gimg":"cat_ads.jpg","c_id":"19","fk_group_id":"6","cat_name":"cat_name","c_status":"1","type_for_group":"1","img":"9.jpg","src":"asset\/img\/main"},{"gid":"7","gtype":"1","g_name":"a","gstatus":"1","gad_stat":"0","gsrc":"asset\/img\/cat\/","gimg":"cat_ads.jpg","c_id":"20","fk_group_id":"7","cat_name":"cat_name","c_status":"1","type_for_group":"1","img":"9.jpg","src":"asset\/img\/main"},{"gid":"7","gtype":"1","g_name":"a","gstatus":"1","gad_stat":"0","gsrc":"asset\/img\/cat\/","gimg":"cat_ads.jpg","c_id":"21","fk_group_id":"7","cat_name":"cat_name","c_status":"1","type_for_group":"1","img":"9.jpg","src":"asset\/img\/main"},{"gid":"7","gtype":"1","g_name":"a","gstatus":"1","gad_stat":"0","gsrc":"asset\/img\/cat\/","gimg":"cat_ads.jpg","c_id":"22","fk_group_id":"7","cat_name":"cat_name","c_status":"1","type_for_group":"1","img":"9.jpg","src":"asset\/img\/main"},{"gid":"7","gtype":"1","g_name":"a","gstatus":"1","gad_stat":"0","gsrc":"asset\/img\/cat\/","gimg":"cat_ads.jpg","c_id":"23","fk_group_id":"7","cat_name":"cat_name","c_status":"1","type_for_group":"1","img":"9.jpg","src":"asset\/img\/main"},{"gid":"7","gtype":"1","g_name":"a","gstatus":"1","gad_stat":"0","gsrc":"asset\/img\/cat\/","gimg":"cat_ads.jpg","c_id":"24","fk_group_id":"7","cat_name":"cat_name","c_status":"1","type_for_group":"1","img":"9.jpg","src":"asset\/img\/main"},{"gid":"7","gtype":"1","g_name":"a","gstatus":"1","gad_stat":"0","gsrc":"asset\/img\/cat\/","gimg":"cat_ads.jpg","c_id":"25","fk_group_id":"7","cat_name":"cat_name","c_status":"1","type_for_group":"1","img":"9.jpg","src":"asset\/img\/main"},{"gid":"7","gtype":"1","g_name":"a","gstatus":"1","gad_stat":"0","gsrc":"asset\/img\/cat\/","gimg":"cat_ads.jpg","c_id":"26","fk_group_id":"7","cat_name":"cat_name","c_status":"1","type_for_group":"1","img":"9.jpg","src":"asset\/img\/main"}]

Answer 1

你在模特中犯了小错误。但它应该是：

$this->db->select('cat_group.*, cat.*');
    $this->db->from('cat');
    $this->db->join('cat_group', 'cat.fk_group_id = cat_group.gid','all')->where('cat_group.gstatus = 1');
    return $this->db->get()->result();

必须返回cat where fk_groupd_id = gid的所有行。现在你应该解析json结果。

<强>更新

$.ajax({
   type: "POST",
   url: 'YOUR_URL',
   dataType:'JSON',
   success: function(data) {

           $.each(data, function(index, element) {
           //console.log(index);
           //alert(element.c_id);               
           console.log(element.c_id);
           console.log(element.cat_name); // here console.log() is used to debug the data.
        });

      }
})

现在由您决定如何以HTML格式显示数据。您可以检查此示例，了解如何解析json对象并将其显示到DOM中：how to parse json data with jquery / javascript?

如何在Jquery中找到其父项的所有子项？

1 个答案: