jQuery访问json文件中数据的方法示例

2019-11-19 12:12:14

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本文实例讲述了jQuery访问json文件中数据的方法。分享给大家供大家参考，具体如下：

有时候我们可能需要用到json文件存储数据，然后通过前台语言直接进行访问。

首先是json文件：

{ "管道": [  {  "ElementId": "标识号",  "GISID": "GISID",  "Label": "编号",  "StartNodeID":"起始节点ID",  "EndNodeID":"终止节点ID",  "StartNodeLabel":"起始节点编号",  "EndNodeLabel":"终止节点编号",  "Physical_PipeDiameter":"管径",  "Physical_PipeMaterialID":"管材",  "Physical_HazenWilliamsC":"海曾威廉C值",  "Physical_Length":"管长",  "Physical_MinorLossCoefficient":"局部阻力系数",  "Physical_InstallationYear":"铺设年代",  "Physical_Address":"地址",  "District":"营销公司",  "DMA":"计量区",  "Zone":"行政区",  "flow":"当前流量",  "velocity":"当前流速",  "headloss":"当前水头损失"  }], "节点": [{  "ElementId": "标识号",  "GISID": "GISID",  "Label": "编号",  "Physical_Elevation":"地面高程",  "Physical_Depth":"埋深",  "Physical_Address":"地址",  "District":"营销公司",  "DMA":"计量区",  "Zone":"行政区",  "hydraulicGrade":"水压标高",  "pressure":"自由水压",  "demand":"节点流量",  "cl":"余氯浓度",  "age":"水龄",  "source":"供水水源" }], "阀门": [{  "ElementId": "标识号",  "GISID": "GISID",  "Label": "编号",  "Physical_Elevation":"地面高程",  "Physical_Depth":"埋深",  "Physical_Diameter":"口径",  "Physical_Status":"阀门状态",  "Physical_Address":"地址",  "District":"营销公司",  "DMA":"计量区",  "Zone":"行政区",  "Physical_InstallationYear":"安装年代" }], "水表": [{  "DIAMETER":"口径",  "CALIBER": "表径",  "MATERIAL": "材质",  "DEPTH":"埋深",  "HEIGHT":"地面高程",  "ADDR":"地址",  "WATREGID": "表号",  "USERNAME":"用户名",  "JUNCTION":"接口类型",  "DISTRICT":"行政区",  "MEASUREIN":"营销公司",  "FINISHDATE":"安装日期" }], "消火栓": [{  "ElementId": "标识号",  "GISID": "GISID",  "Label": "编号",  "Physical_Elevation":"地面高程",  "Physical_Depth":"埋深",  "Physical_Address":"地址",  "District":"营销公司",  "DMA":"计量区",  "Zone":"行政区",  "Physical_Diameter":"口径",  "Physical_Type":"样式" }]}

创建CriteriaQuery.json文件，文件内容如上。

前台代码：

<html><head>  <meta charset="GBK"/>  <title>jQuery访问json</title>  <script type="text/javascript" src="https://libs.baidu.com/jquery/1.4.0/jquery.min.js"></script>  <script type="text/javascript">    $(function (){      $("#btn").click(function(){        $.getJSON("CriteriaQuery.json",function(data){          var $jsontip = $("#jsonTip");          var strHtml = "";          $jsontip.empty();          $.each(data.管道,function(infoIndex,info){            for(var o in info){              strHtml +=info[o];            }            //strHtml +=info["ElementId"];          });          $jsontip.html(strHtml);        })      })    })  </script></head><body><div id="divframe">  <div class="loadTitle">    <input type="button" value="获取数据" id="btn"/>  </div>  <div id="jsonTip">  </div></div></body></html>

我这里的jquery用的1.4.0版本的js文件，即https://libs.baidu.com/jquery/1.4.0/jquery.min.js

json文件与html放在同一个目录下。

运行代码，点击获取数据按钮，就能够在页面上看到遍历json文件所得到的“管道”的所有信息。当然，也可以通过key来获取到json文件的value，即