Use EVAL to process jqchart jquery line chart return data invalid solution

Use EVAL to process jqchart jquery line chart return data invalid solution_jquery

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Release： 2016-05-16 15:29:40

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The eval function can parse some processed program code to reach a state that can be executed. I checked many posts. When the jqchart plug-in makes a line chart, all the returned data are eval when processing it, but I can't figure it out. Later I found out:

1. There is no need for eval processing at all, just intercept the string directly (the return value must be spliced);

2. When the processed string is put into the data of the series, [];

Here is the code:

Only one

;

<script>里面
<script type="text/javascript" src="jquery.1.8.2.js"></script>
<script type="text/javascript" src="jquery-jqChart-min.js"></script>
<script type="text/javascript">
$(function () {
 $.get("tgajax.php",function(data){
  var dom = data.substring(0,data.length-1);//主要是对返回数据的处理，后面很明显多了一个","
  //var dom = eval('(' + dom + ')'); 
  //alert( dom);
 $('#jqChart').jqChart({
  title: { text: '线形图示例' },
  axes: [
   {
    location: 'left',
    minimum: 1,
    maximum: 10,
    interval: 1,
   }
  ],
   series: [
   {
    type: 'line',
    title:'上海',
    markers: null,//拐点不用圆点标示 
    strokeStyle: 'blue' , 
    data: [['json', 1], ['per', 9], ['perter', 3]]
   },
   {
    type: 'line',//line,Column
    title:'北京',
    strokeStyle: 'red' , 
    data:[dom]
   },
   ]
  }); 
});
});
</script>

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I used simple php to create the background processing page, and I don’t know how to do anything else

<&#63;php
include ("configaz.php"); //数据库连接在另一个文件内，这里就不弄了
 $sql="select sid,sname,sprice,count(sprice) as pricenum from shangpin group by sname";
 $query=mysql_query($sql);
 $row=mysql_fetch_array($query);
 while($row=mysql_fetch_array($query)){
 $pricenum=$row['pricenum'];
 $sname=$row['sname'];
 } 
 echo $str .= "['".$sname."',".$pricenum."],";//拼接字符串，按照jqChart要求的字符串格式，当然用数组更好，可惜不怎么会

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There must be a better way, but I just started learning and slowly exploring it

I believe there are more solutions than the above. There must be better solutions. We welcome everyone to learn and make progress together.

ps: ajax reads data and uses jqchart to display charts

In recent projects, chart effects need to be displayed, and the chart plug-ins collected have finally come into use.

But compared with jqchart, there are still many differences.

Realization effect:

I rewrote jqchart.

The first thing to solve is not displaying the x-axis and y-axis:

//各DIV作成 
     // 取消标题显示 
     /* 
     this.titleBox//Title 
      =this.mkBoxElement('T', 
       this.op.titleLeft,this.op.titleTop 
      ).appendTo(this.jQcanvasBox) 
      .css('width',this.op.width-this.op.titleLeft)//fix for safari3 2007.12.4 
      .get(0); 
     */ 
     // 取消y轴数字显示 
     /* 
     this.scaleYBox//Y軸スケール 
      =this.mkBoxElement('Y', 
       this.op.scaleYLeft,this.op.scaleYTop 
      ).appendTo(this.jQcanvasBox).get(0); 
     */ 
     // 取消x轴分类显示 
     /* 
     this.scaleXBox//X軸スケール 
      =this.mkBoxElement('X', 
       this.op.scaleXLeft,this.op.scaleXTop 
     ).appendTo(this.jQcanvasBox).get(0); 
     */

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Secondly, for the text at the inflection point, the original display was the corresponding data value, but now the corresponding x-axis name needs to be displayed:

if( x <= op.width){ 
       var dx=x-op.paddingL,dy=y-op.paddingT; 
       var dxx = i<=0 &#63; (dx+op.labelDataOffsetX - 5 + 'px'):( dx+op.labelDataOffsetX - 20 + 'px'); //坐标点x轴偏移 
       var dyy = i%2 &#63; (dy+op.labelDataOffsetY - 25 + 'px'):(dy+op.labelDataOffsetY - 5 + 'px'); //坐标点y轴偏移 
       it.wrtText( 
        //dx+op.labelDataOffsetX - 20 + 'px', 
        dxx, 
        //dy+op.labelDataOffsetY - 10 + 'px', 
        dyy, 
        //op.rows[i],  // pre: 坐标点data值 
        op.txtpointers[i], // cychai:坐标点文字 
        op, 
        "#jQchart-data-D-"+op.id 
       ).css('color',(op.data.length==1)&#63;'#333':strokeStyle) 
       .css({"width":"100px","font-size":"12px"});  // cychai:样式控制

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The default data can be displayed. The next step is to collaborate with development.

I hope to use ajax to asynchronously obtain data and then display it in the foreground.

Here, I used a sample page chartdata.html, which is the required data page

[{labelX : ["Design","Portability","Easy to use","Battery standby","Camera function","Zoom"],data:[[5,7,2,3 ,9,4]]}]

In the foreground, I request the page through ajax, process the returned json data, and pass it to chartSetting:

$(function(){ 
 $.ajax({ 
  url: "chartdata.html", 
  type: "GET", 
  success: function(cdata){ 
   showDDChart(cdata); 
  } 
 }); 
 function showDDChart(cdata){ 
  var dd_chart = eval(cdata)[0]; 
  var chartSetting={ 
   config : {  
    title : "",  
    titleLeft: 70,  
    labelX :dd_chart.labelX,  
    //labelX :["外观设计","便携性","易用性","电池待机","摄像功能","变焦"], 
    scaleY : {min: 0,max:10,gap:2}, 
    width: 300+25,  
    height: 125+50,  
    paddingL : 10,  
    paddingT : 10  
   },  
   //data: [[5,3,1,8,4,9]] 
   data :dd_chart.data 
  };  
  $('#canvasMyID').jQchart(chartSetting); 
 } 
});

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Full html page:

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OK, you’re done! I will put the complete example in my resources.

I haven’t used jquery ajax for a long time, and I’m a bit unfamiliar with spelling out json data. I still like to develop this kind of logical work....