用AJAX，PHP和MySQL繪制圖表線

Question

我正在使用Flot插件來獲取一條帶有兩條線（銷售和購買）的圖表線（例如本示例），但是數據在mysql數據庫中並通過AJAX接收。 所以我有這個：

HTML：

<div id="graph" class="demo-placeholder"></div>

PHP：

sales.php

<?php 
  $sql = "SELECT * from sales where YEAR(date)='2013'";
  $res = mysql_query($sql);
  $return = [];

while($row = mysql_fetch_array($res)){
    $return[] = [$row['date'],$row['amount']];
}
echo json_encode(array("label"=>"Sales","data"=>$return));
?>

purchases.php

<?php 
  $sql = "SELECT * from purchases where YEAR(date)='2013'";
  $res = mysql_query($sql);
  $return = [];

while($row = mysql_fetch_array($res)){
    $return[] = [$row['date'],$row['amount']];
}
echo json_encode(array("label"=>"Purchases","data"=>$return));
?>

因此，在我的JS代碼中，我通過AJAX獲得了這些數據，並將其放入啟用了工具提示的Flot圖表線中：

var purchases,sales;

    $.ajax({url: "purchases.php",
        type: "GET",
        dataType: "json",
        success: function(resp)
        {
            purchases = resp.data; //Showing result:[["2013-02-01","52"],["2013-03-01","40"],["2013-03-28","200"]]          
        }
    });

    $.ajax({
        url: "sales.php",
        type: "GET",
        dataType: "json",
        success: function(resp)
        {
            sales = resp.data; //Showing result: [["2013-02-05","502"],["2013-03-16","240"],["2013-03-21","260"]]       
        }
    });

var dataset = [
        {
            label: "Purchases",
            data: purchases,
        },
        {
            label: "Sales",
            data: sales,
        }
    ];

var chart_plot_01_settings = {
      series: {
        lines: {
          show: true,
          fill: true
        },
        splines: {
          show: false,
          tension: 0.4,
          lineWidth: 1,
          fill: 0.4
        },
        points: {
          radius: 3,
          show: true 
        },
        shadowSize: 2 
      },
      grid: { 
        verticalLines: true,
        hoverable: true,
        clickable: true,
        tickColor: "#d5d5d5",
        borderWidth: 1,
        color: '#717171'
      },
      colors: ["rgba(38, 185, 154, 0.38)", "rgba(3, 88, 106, 0.38)"],
      xaxis: {
        tickColor: "rgba(51, 51, 51, 0.06)",
        mode: "time",
        tickSize: [1, "month"],
        axisLabel: "Date",
        axisLabelUseCanvas: true,
        axisLabelFontSizePixels: 12,
        axisLabelFontFamily: 'Verdana, Arial',
        axisLabelPadding: 10
      },
      yaxis: {
        ticks: 8,
        axisLabel: "Amount",
        tickColor: "rgba(51, 51, 51, 0.06)",
      },
      tooltip: true, 
    }

if ($("#graph").length){
        $.plot( $("#graph"), dataset,  chart_plot_01_settings );

        $("<div id='tooltip'></div>").css({
            position: "absolute",
            display: "none",
            border: "1px solid #fdd",
            padding: "2px",
            "background-color": "#fee",
            opacity: 0.80
        }).appendTo("body");

        $("#graph").bind("plothover", function (event, pos, item) {

            if (item) {
                var x = item.datapoint[0],
                    y = item.datapoint[1];

                var date = new Date(x);                 

                $("#tooltip").html("Date: " +x + " Amount: "+y).css({top: item.pageY+5, left: item.pageX+5}).fadeIn(200);

            } else {
                $("#tooltip").hide();
            }

        });
    }

問題是圖表線不顯示任何數據，而是空白。 我在if ($("#graph").length){行之后添加了console.log(sales)行，它在控制台中顯示未定義 ，但是如果我將結果放入成功AJAX函數中的控制台中，它將顯示數據。

我該如何解決？ 我需要一些幫助。

UPDATE

我修改了PHP代碼行：

$return[] = [strtotime($row['date'])*1000,$row['amount']];

我修改了JS代碼，添加了show_chart函數：

function show_chart(labell,dataa) { 
    var dataset = [{label: labell,data: dataa}];

    var chart_plot_01_settings = {
      series: {
        lines: {
          show: true,
          fill: true
        },
        splines: {
          show: false,
          tension: 0.4,
          lineWidth: 1,
          fill: 0.4
        },
        points: {
          radius: 3,
          show: true 
        },
        shadowSize: 2 
      },
      grid: { 
        verticalLines: true,
        hoverable: true,
        clickable: true,
        tickColor: "#d5d5d5",
        borderWidth: 1,
        color: '#717171'
      },
      colors: ["rgba(38, 185, 154, 0.38)", "rgba(3, 88, 106, 0.38)"],
      xaxis: {
        tickColor: "rgba(51, 51, 51, 0.06)",
        mode: "time",
        tickSize: [1, "month"],
        //tickLength: 10,
        axisLabel: "Date",
        axisLabelUseCanvas: true,
        axisLabelFontSizePixels: 12,
        axisLabelFontFamily: 'Verdana, Arial',
        axisLabelPadding: 10
      },
      yaxis: {
        ticks: 8,
        axisLabel: "Amount",
        tickColor: "rgba(51, 51, 51, 0.06)",
      },
      tooltip: true,
    }

    $(document).ready(function () {
        $.plot($("#graph"), dataset, chart_plot_01_settings);

        //Tooltip
        $("<div id='tooltip'></div>").css({
            position: "absolute",
            display: "none",
            border: "1px solid #fdd",
            padding: "2px",
            "background-color": "#fee",
            opacity: 0.80
        }).appendTo("body");

        $("#graph").bind("plothover", function (event, pos, item) {

            if (item) {
                var x = item.datapoint[0],
                    y = item.datapoint[1];

                var date = new Date(x);

                $("#tooltip").html("Date: " + ('0' + (date.getMonth()+1)).slice(-2) + '/'+ date.getFullYear()+ " | Amount: "+y).css({top: item.pageY+5, left: item.pageX+5}).fadeIn(200);

            } else {
                $("#tooltip").hide();
            }

        });
    });

} //show chart

var purchases,sales;

    $.ajax({url: "purchases.php",
        type: "GET",
        dataType: "json",
        success: function(resp)
        {
            purchases = resp.data;
            var label1 = resp.label;
            show_chart(label1,purchases);       
        }
    });

    $.ajax({
        url: "sales.php",
        type: "GET",
        dataType: "json",
        success: function(resp)
        {
            sales = resp.data;
            var label2 = resp.label;
            show_chart(label2,sales);
        }
    });

但問題是，它僅顯示“ 銷售”或“ 購買”圖表線，而我想像此示例一樣顯示兩個圖表線（“ 銷售”和“購買” ）。

我該如何解決？

Answer 1

您的時間數據格式錯誤，Flot需要JavaScript時間戳。 代替

[["2013-02-01","52"],["2013-03-01","40"],["2013-03-28","200"]]          

你需要

[[1359676800000,"52"],[1362096000000,"40"],[1364428800000,"200"]]          

采用

strtotime("2013-02-01 UTC") * 1000

在您的PHP代碼中生成時間戳（請參閱此處 ）。

Answer 2

最后，我可以解決它，將我的2個php文件合並為一個，並放置一個最終數組：

echo json_encode(array($return,$returnn));

在AJAX成功中：

success: function(resp)
{
    var result1 = resp[0];//purchases
    var result2 = resp[1];//sales
    show_chart(result1,result2);
}

並在show_cart函數中：

function show_chart(data1,data2) {
    var dataset = [{label: "Purchases",data: data1},{label: "Sales",data: data2}];
    //and continues...
}