Question

在ajax成功方法的position循环中$.each变量下面的代码中，单击btn_search时返回undefined。我要实现的是在checkPosition循环中将position函数的值分配给变量$.each，以便我可以使用变量的值来确定要显示的结果。我该怎么办？

<script type="text/javascript">
   var url = "{{URL::route('find.paid.trade.cat') }}";
   var position = '';

$(function(){

   $('#btn_search').click(function(e){

    $("#results_tbl").empty();
    var category_id = $('#trade_category').val();
   $.ajax({
      method:'POST',
      url: url,
      data : {
          category_id : category_id,
         },
      success:function(response){

        $.each(response.result, function(index, value){ 

           position = checkPosition(response.result[index]['id']);
          console.log(position);
           if(position == 1){
            $('#results_tbl').append('<tr><td>'+response.result[index]['business_name']+
                    '</td><td><button data-id="'+response.result[index]['id']+'" data-cat_id="'+response.result[index]['business_trade_id']+'"'+
                    'data-subscription_id="'+response.result[index]['active_subscription_id']+'" class="btn_make_1st btn-primary btn">1st Positions</button>'+
                    '<button data-id="'+response.result[index]['id']+'" class="btn btn_make_2nd btn-info">Make 2nd</button>'+
                    '<button data-id="'+response.result[index]['id']+'" class="btn btn_make_3rd btn-success">Make 3rd</button></td>'+
                    '<td></td></tr>')
           }
          else
           {
                $('#results_tbl').append('<tr><td>'+response.result[index]['business_name']+
                    '</td><td><button data-id="'+response.result[index]['id']+'" data-cat_id="'+response.result[index]['business_trade_id']+'"'+
                    'data-subscription_id="'+response.result[index]['active_subscription_id']+'" class="btn_make_1st btn-primary btn">Make 1st</button>'+
                    '<button data-id="'+response.result[index]['id']+'" class="btn btn_make_2nd btn-info">Make 2nd</button>'+
                    '<button data-id="'+response.result[index]['id']+'" class="btn btn_make_3rd btn-success">Make 3rd</button></td>'+
                    '<td></td></tr>')
           }

        })
      },
      error:function(){

      }
   })

});



});



});


 })



function checkPosition(trade_id)
{
    var trade_current_position_url = "{{URL::route('find.position') }}";
    var current_position ;
    $.ajax({
      method:'POST',
      url:trade_current_position_url,
      data:{
        trade_id: trade_id
      },
      success:function(response){
         current_position = response.current_pos;
         returnPosition(current_position);
      },
      error:function(){

      }
    });

}



function returnPosition(position)
{
return position;
}

Answer 1

checkPosition函数总是返回undefined，因为它本身不返回任何东西，因此从服务器接收到结果后，其ajax函数的答案也将准备就绪。您必须将作品作为函数传递给它：

function checkPosition(trade_id, doIfOk){
var trade_current_position_url = "{{URL::route('find.position') }}";
var current_position ;
$.ajax({
  method:'POST',
  url:trade_current_position_url,
  data:{
    trade_id: trade_id
  },
  success:function(response){
     current_position = response.current_pos;
     doIfOk(current_position);
  },
  error:function(){

  }
});

现在每个：

checkPosition(response.result[index]['id'], function(position){
      console.log(position);
       if(position == 1){
        $('#results_tbl').append('<tr><td>'+response.result[index]['business_name']+
                '</td><td><button data-id="'+response.result[index]['id']+'" data-cat_id="'+response.result[index]['business_trade_id']+'"'+
                'data-subscription_id="'+response.result[index]['active_subscription_id']+'" class="btn_make_1st btn-primary btn">1st Positions</button>'+
                '<button data-id="'+response.result[index]['id']+'" class="btn btn_make_2nd btn-info">Make 2nd</button>'+
                '<button data-id="'+response.result[index]['id']+'" class="btn btn_make_3rd btn-success">Make 3rd</button></td>'+
                '<td></td></tr>')
       }
      else
       {
            $('#results_tbl').append('<tr><td>'+response.result[index]['business_name']+
                '</td><td><button data-id="'+response.result[index]['id']+'" data-cat_id="'+response.result[index]['business_trade_id']+'"'+
                'data-subscription_id="'+response.result[index]['active_subscription_id']+'" class="btn_make_1st btn-primary btn">Make 1st</button>'+
                '<button data-id="'+response.result[index]['id']+'" class="btn btn_make_2nd btn-info">Make 2nd</button>'+
                '<button data-id="'+response.result[index]['id']+'" class="btn btn_make_3rd btn-success">Make 3rd</button></td>'+
                '<td></td></tr>')
       }
});

jQuery中的函数调用在ajax成功的每个循环中返回未定义的变量

1 个答案: