Question

我有一个json文件：

{"markers":[
    { "latitude":11.58655, "longitude":122.755402, "type":"A"},
    { "latitude":11.00698, "longitude":124.612801, "type":"B"},
    { "latitude":10.30723, "longitude":123.898399, "type":"A"},
    { "latitude":11.24775, "longitude":125.003502, "type":"C"},
    { "latitude":11.03693, "longitude":125.719498, "type":"Z"}
]}

和ajax请求：

$.ajax({        
       type: "POST",
       url: 'data.txt',
       dataType: 'json',
       success: function(data){  locations.length = 0;        
        for (p = 0; p < data.markers.length; p++) {  
locations.push(Array(data.markers[p].latitude,data.markers[p].longitude));               
var marker = new google.maps.Marker({                
position: new   

google.maps.LatLng(data.markers[p].latitude,data.markers[p].longitude),
map: map,  title:"marker "+p  });  }  }, 
error: function (xhr,status,errorStr) { 
alert("status="+status+", error="+errorStr)
 }     
});

这对我来说很好，但我需要根据他们的 TYPE 获取数据。如果我有办法可以根据“ A “所以我只获得 TYPE = A

的数据

Answer 1

您可以使用jQuery.grep()

像这样

var filteredData = $.grep( data, function( d, i ) {
  return d.TYPE == 'A';
});

并循环变量filteredData

检查文档http://api.jquery.com/jQuery.grep/

Answer 2

for (p = 0; p < data.markers.length; p++) { // this is your code
 if(data.markers[p].type == 'A'){
    //do stuff with type : A only
    }
}

Answer 3

最简单的方法是检查循环内部

$.ajax({        
   type: "POST",
   url: 'data.txt',
   dataType: 'json',
   success: function(data){  locations.length = 0;        
    for (p = 0; p < data.markers.length; p++) {  
        if(data.markers[p].type === 'A'){
             locations.push(Array(data.markers[p].latitude,data.markers[p].longitude));               
             var marker = new google.maps.Marker({                
                  position: new google.maps.LatLng(data.markers[p].latitude,data.markers[p].longitude), map: map,  title:"marker "+p  
             });  
       } 

    } 
}, 
error: function (xhr,status,errorStr) { 
   alert("status="+status+", error="+errorStr)
 }     
});

如何在Ajax请求中查询JSON数据

3 个答案: