arcgis api for javascript 學習（三）調用發佈地圖信息，並將地圖屬性信息輸出到Excel表中

時間 2019-12-13

標籤 arcgis api javascript 學習調用發佈地圖信息屬性輸出 excel 表中欄目 JavaScript 简体版

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吐血推薦：網上搜了好久關於webgis地圖屬性表輸出到Excel表，並沒能找到相關有價值的信息，在小白麪前，這就是一臉懵x啊！網上要麼是關於前端如何在頁面上直接導出excel，和webgis半毛錢關係沒有，要麼查看arcgis api for javascript 的幫助文檔，裏面有的實例是顯示屬性表信息，如何同時顯示並能輸出excel表的文章介紹，沒找到。。那隻能經過看代碼，進行改進來實現上面的兩種功能，終於終於。。。。找到了他們之間的聯繫，實現出來了！！javascript

一、首先我已經發布過地圖並找到URL，瞭解直接要發佈地圖的屬性表信息css

二、我實現的代碼功能是經過查詢一個區域的名稱，找到該區域的經緯值，並輸出到excel中：html

三、將相關信息查詢出來，顯示頁面中，實現的結果以下：前端

四、最關鍵一步，將這些信息輸出到excel中去！點擊按鍵，如圖java

五、代碼部分：web

<!DOCTYPE html>
<html>


<head>
    <title>圖層屬性查詢</title>
    <meta http-equiv="content-type" content="text/html;charset=utf-8">
    <meta http-equiv="Access-Control-Allow-Origin" content="*">
    <link rel="stylesheet" href="https://js.arcgis.com/3.23/esri/css/esri.css">
    <script src="https://js.arcgis.com/3.23/"></script>
    <style>
        #map{
            position:relative;
            height:500px;
            width:100%;
        }
    </style>
</head>

<body>
<div>
    輸入省份或省會名稱:
    <input type="text" id="searchText" size="40" value="烏魯木齊" />
    <input type="button" value="查詢" id="find"/>
    <div style="width:200px;margin:auto;text-align:center;">
        <button onclick="ok()">導出查詢地區經緯度excel文件</button>
    </div>
    <div id="tbl"> </div>

</div>

<div id='map'>

</div>
<script>
    require([
                "esri/map",
                "esri/tasks/FindTask",
                "esri/tasks/FindParameters",
                "dojo/_base/array",
                "esri/layers/ArcGISDynamicMapServiceLayer"],
            function (
                    Map,
                    FindTask,
                    FindParameters,
                    Array,
                    ArcGISDynamicMapServiceLayer) {
                var map = new Map("map", {
                    center: [116.403119,39.915599],
                    zoom:3,
                    basemap: "topo"
                });


                //調用地圖服務
                DyLayer=new ArcGISDynamicMapServiceLayer('http://localhost:6080/arcgis/rest/services/dtchina/MapServer');
                map.addLayer(DyLayer);
                var find = new FindTask("http://localhost:6080/arcgis/rest/services/dtchina/MapServer");
                var params = new FindParameters();
                // layerIds、seachFields、searchText
                params.layerIds = [1];  //對layerid=0和1的圖層查詢
                params.searchFields = ["FID", "name","id","lon","lat"];//查該圖層的哪些字段
                document.getElementById("find").onclick = doFind;



                function doFind() {
                    params.searchText = document.getElementById("searchText").value;
                    find.execute(params, showResults); //執行查詢
                }

                function showResults(results) {
                    console.log("results", results);
                    let result, attribs;
                    let s = ["<table border=\"2\"> " +
                    "<thead>" +
                    "<tr style=\" background-color:#98a9cc;\">" +
                    "<td>Name</td> <td>FID</td> <td>ID</td> <td>lon</td> <td>lat</td> </tr> " +
                    "</thead> " +
                    "<tbody id=\"state\">"];



                    Array.forEach(results, function (result) {
                        attribs = result.feature.attributes;
                        s.push("<tr>  <td>" + attribs.name + "</td>  <td>" + attribs.FID + "</td>  <td>" +attribs.id+ "</td>  <td>" + attribs.lon + "</td>  <td>" + attribs.lat + "</td> </tr>" );
                    });

                    s.push("</tbody>  </table>");
                    console.log('arr',s);
                    document.getElementById("tbl").innerHTML = s.join("");//string.split('');
                }
            });
    var ok = (function () {
        var uri = 'data:application/vnd.ms-excel;base64,',
                template = '<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" ' +
                        'xmlns="https://www.w3.org/TR/2018/SPSD-html401-20180327/">' +
                        '<head><!--[if gte mso 9]><xml><x:ExcelWorkbook>' +
                        '<x:ExcelWorksheets><x:ExcelWorksheet><x:Name>{worksheet}</x:Name>' +
                        '<x:WorksheetOptions><x:DisplayGridlines/></x:WorksheetOptions></x:ExcelWorksheet>' +
                        '</x:ExcelWorksheets></x:ExcelWorkbook></xml><![endif]--></head><body><table>{table}</table></body></html>',
                base64 = function (s) { return window.btoa(unescape(encodeURIComponent(s))) },
                format = function (s, c) { return s.replace(/{(\w+)}/g, function (m, p) { return c[p]; }) }
        return function (table, name) {
            var tables = document.getElementById('state');
            var ctx = { worksheet: name || 'Worksheet', table: tables.innerHTML }
            window.location.href = uri + base64(format(template, ctx));
        }
    })();
    function ExportSupplierMonthlyData() {
        try {
            tableToExcel();
        } catch (err) {
            bootbox.alert('沒有數據，導出失敗');
        }
    }
</script>
</body>

</html>