jQuery訪問json文件中數據的方法示例

2019-11-19 12:12:14

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本文實例講述了jQuery訪問json文件中數據的方法。分享給大家供大家參考，具體如下：

有時候我們可能需要用到json文件存儲數據，然后通過前臺語言直接進行訪問。

首先是json文件：

{ "管道": [  {  "ElementId": "標識號",  "GISID": "GISID",  "Label": "編號",  "StartNodeID":"起始節點ID",  "EndNodeID":"終止節點ID",  "StartNodeLabel":"起始節點編號",  "EndNodeLabel":"終止節點編號",  "Physical_PipeDiameter":"管徑",  "Physical_PipeMaterialID":"管材",  "Physical_HazenWilliamsC":"海曾威廉C值",  "Physical_Length":"管長",  "Physical_MinorLossCoefficient":"局部阻力系數",  "Physical_InstallationYear":"鋪設年代",  "Physical_Address":"地址",  "District":"營銷公司",  "DMA":"計量區",  "Zone":"行政區",  "flow":"當前流量",  "velocity":"當前流速",  "headloss":"當前水頭損失"  }], "節點": [{  "ElementId": "標識號",  "GISID": "GISID",  "Label": "編號",  "Physical_Elevation":"地面高程",  "Physical_Depth":"埋深",  "Physical_Address":"地址",  "District":"營銷公司",  "DMA":"計量區",  "Zone":"行政區",  "hydraulicGrade":"水壓標高",  "pressure":"自由水壓",  "demand":"節點流量",  "cl":"余氯濃度",  "age":"水齡",  "source":"供水水源" }], "閥門": [{  "ElementId": "標識號",  "GISID": "GISID",  "Label": "編號",  "Physical_Elevation":"地面高程",  "Physical_Depth":"埋深",  "Physical_Diameter":"口徑",  "Physical_Status":"閥門狀態",  "Physical_Address":"地址",  "District":"營銷公司",  "DMA":"計量區",  "Zone":"行政區",  "Physical_InstallationYear":"安裝年代" }], "水表": [{  "DIAMETER":"口徑",  "CALIBER": "表徑",  "MATERIAL": "材質",  "DEPTH":"埋深",  "HEIGHT":"地面高程",  "ADDR":"地址",  "WATREGID": "表號",  "USERNAME":"用戶名",  "JUNCTION":"接口類型",  "DISTRICT":"行政區",  "MEASUREIN":"營銷公司",  "FINISHDATE":"安裝日期" }], "消火栓": [{  "ElementId": "標識號",  "GISID": "GISID",  "Label": "編號",  "Physical_Elevation":"地面高程",  "Physical_Depth":"埋深",  "Physical_Address":"地址",  "District":"營銷公司",  "DMA":"計量區",  "Zone":"行政區",  "Physical_Diameter":"口徑",  "Physical_Type":"樣式" }]}

創建CriteriaQuery.json文件，文件內容如上。

前臺代碼：

<html><head>  <meta charset="GBK"/>  <title>jQuery訪問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="獲取數據" id="btn"/>  </div>  <div id="jsonTip">  </div></div></body></html>

我這里的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文件與html放在同一個目錄下。

運行代碼，點擊獲取數據按鈕，就能夠在頁面上看到遍歷json文件所得到的“管道”的所有信息。當然，也可以通過key來獲取到json文件的value，即