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HTML

              
                <div class="container">
  <div class="row">
    <section>
      <ul class="nav nav-tabs" role="tablist">
        <li role="presentation" class="nav-item">
          <a href="#step1" class="nav-link active" data-toggle="tab" aria-controls="step1" role="tab" title="Step 1">
                            Load Data
                        </a>
        </li>

        <li role="presentation" class="nav-item">
          <a href="#step2" class="nav-link" data-toggle="tab" aria-controls="step2" role="tab" title="Step 2">
                            Prepare Data
                        </a>
        </li>
        <li role="presentation" class="nav-item">
          <a href="#step3" class="nav-link disable" data-toggle="tab" aria-controls="step3" role="tab" title="Step 3">
                            Present Data
                        </a>
        </li>
      </ul>

      <form role="form">
        <div class="tab-content">
          <div class="tab-pane active" role="tabpanel" id="step1">
            <div class="form-group">
              <label for="exampleFormControlSelect1">Data Source Select</label>
              <select class="form-control" id="dataSourceSelect">
              </select>
            </div>
            <div class="form-group" id="sourceTableContainer">
            </div>
          </div>
          <div class="tab-pane" role="tabpanel" id="step2">
            <p>Transform data with a SQL</p>
            <form>
              <div class="form-group" id="dataQueryContainer"></div>
              <div class="form-group" id="transformTableContainer"></div>
              <div class="form-group" id="dataSummaryContainer"></div>
            </form>
          </div>
          <div class="tab-pane" role="tabpanel" id="step3">
            <p>Visualize your data</p>
            <div class="row">
              <div id="grammarContainer" class="col-4">
                <div id="facetContainer" class="row">
                </div>
                <div id="geomContainer" class="row">
                </div>
                <div id="coordContainer" class="row">
                </div>
                <div id="geomAttrContainer" class="row">
                </div>
              </div>
              <div id="chartContainer" class="col-8">
                <div id="chart"></div>
              </div>
            </div>
          </div>
          <div class="clearfix"></div>
        </div>
      </form>
    </section>
  </div>
</div>

              
            
!

CSS

              
                body {
  background-color: #eee;
  margin-top: 10px;
}

section {
  width: 100%;
}

#dataSourceSelect {
  width: 200px;
}

table.dataTable.compact tbody th, table.dataTable.compact tbody td {
  padding: 2px;
  font-size: 10px;
}

pre, label, p , .dataTables_paginate, .dataTables_info{
  font-size: 10px;
}
              
            
!

JS

              
                class SqlTable {
  constructor(data) {
    this.data = data;
  }

  async query(sql) {
    // following line of code does not run in full page view due to security concern.
    //const query_str = sql.replace(/(?<=FROM\s+)\w+/, "CSV(?)");
    const query_str = sql.replace("table", "CSV(?)");
    return await alasql.promise(query_str, [this.data]);
  }
}

// Ajax async request
const request = {
  get: url => {
    return new Promise((resolve, reject) => {
      axios
        .get(url)
        .then(response => {
          resolve({ data: response.data });
        })
        .catch(error => {
          resolve({ data: error });
        });
    });
  }
};

// Load the data
async function loadTable(url) {
  // Raw data
  let csv = await request.get(url);
  return new SqlTable(csv.data);
}

function sanitizeData(jsonArray) {
  let newKey;
  jsonArray.forEach(function(item) {
    for (key in item) {
      newKey = key.replace(/\s/g, "").replace(/\./g, "");
      if (key != newKey) {
        item[newKey] = item[key];
        delete item[key];
      }
    }
  });
  return jsonArray;
}

function displayData(tableId, data) {
  // tricky to clone array
  let display_data = JSON.parse(JSON.stringify(data));
  display_data = sanitizeData(display_data);
  let columns = [];
  for (let item in display_data[0]) {
    columns.push({ data: item, title: item });
  }
  $("#" + tableId).DataTable({
    data: display_data,
    columns: columns,
    destroy: true
  });
}

function isString(o) {
    return typeof o == "string" || (typeof o == "object" && o.constructor === String);
}

function summaryData(data) {
  let summary = {};
  summary.count = data.length;
  summary.fields = [];
  for (let p in data[0]) {
    let field = {};
    field.name = p;
    if ( isString(data[0][p]) ) {
      field.type = "string";
    } else {
      field.type = "number";
    }
    summary.fields.push(field);
  }
  
  for (let f of summary.fields) {
      if ( f.type == "number" ) {
        f.max = d3.max(data, x => x[f.name]);
        f.min = d3.min(data, x => x[f.name]);
        f.mean = d3.mean(data, x => x[f.name]);
        f.median = d3.median(data, x => x[f.name]);
        f.deviation = d3.deviation(data, x => x[f.name]);
      } else {
        f.values = Array.from(new Set(data.map(x => x[f.name])));
      }
  }
  return summary;
}

function formatSummary(data) {
  let result = "data summary:\n";
  result = result + "count:"+ data.count + "\n";
  for(let field of data.fields) {
    result = result + JSON.stringify(field) + "\n";
  }
  return result;
}

function rendorDataTable(containerId, tableId, data) {
  $("#" + containerId).empty();
  $("#" + containerId).append(
    '<table class="table table-sm table-striped compact" style="width:100%" id="' + tableId + '"></table>'
  );
  displayData(tableId, data);
}


async function updateDataTransform(dataTable) {
  const sqlQuery = "SELECT * FROM table";
  const data = await dataTable.query(sqlQuery);
  const summary = summaryData(data);
  updateDataPresenting(data);
  
  $("#dataSummaryContainer").empty();
  $("#dataSummaryContainer").append('<pre id="dataSummary"></pre>');
  $("#dataSummary").text(formatSummary(summary));
  
  $("#dataQueryContainer").empty();
  $("#dataQueryContainer").append('<textarea class="form-control" id="dataQueryTextarea" rows="2"></textarea>');
  $("#dataQueryTextarea").text(sqlQuery);
  let oldVal = $("#dataQueryTextarea").val();
  $("#dataQueryTextarea").on('change keyup paste', async function() {
    let currentVal = $(this).val();
    if(currentVal == oldVal) {
        return; //check to prevent multiple simultaneous triggers
    }
    oldVal = currentVal;
    try {
      const queryResult = await dataTable.query(currentVal);
      console.log(queryResult);
      if ( queryResult.length > 0 ) {
        rendorDataTable("transformTableContainer","transformTable", queryResult);
        updateDataPresenting(queryResult);
      }
    } catch (err) {
      console.log(err);
    }
  });
  rendorDataTable("transformTableContainer","transformTable", data);
}

function updateDataPresenting(queryResult) {
  const chartScriptName = "g2chart";
  const geom = ["","point","path","line","area","interval","intervalStack","polygon","edge","schema","heatmap"];
  const coord = ["","rect","polar","theta","helix"];
  const geom_attributes = ["position","color","size","shape","opacity","label"];
  const querySummary = summaryData(queryResult);
  const fields = querySummary.fields.map( x => x.name);
  
  // initialize facet selection
  $("#facetContainer").empty();
  const facetSelectContainer = d3.select("#facetContainer")
    .classed("container",true)
    .append("ul")
    .append("li")
    .append("label");
  
  facetSelectContainer.text("facet");
  facetSelectContainer.append("br");
  const facetSelect = facetSelectContainer.append("select")
    .style("width","200px")
    .classed("select2 input-sm",true)
    .attr("id","facetSelect")
    .attr("name","facet");
  
  $('#facetSelect').select2({
    data: fields,
    theme: "bootstrap",
    multiple: true,
    maximumSelectionLength: 2
  });
  $('#facetSelect').on('change',updateChart);
  $('#facetSelect').on("select2:select", updateSelect2Order);
  
  // initialize geometry selection
  $("#geomContainer").empty();
  const geomSelectContainer = d3.select("#geomContainer")
    .classed("container",true)
    .append("ul")
    .append("li")
    .append("label");
  
  geomSelectContainer.text("geometry");
  geomSelectContainer.append("br");
  const geomSelect = geomSelectContainer.append("select")
    .style("width","200px")
    .classed("select2 input-sm",true)
    .attr("id","geomSelect")
    .attr("name","geom");
  
  $('#geomSelect').select2({
    data: geom,
    theme: "bootstrap"
  });
  $('#geomSelect').on('change',updateChart);
  
  // initialize coord selection
  $("#coordContainer").empty();
  const coordSelectContainer = d3.select("#coordContainer")
    .classed("container",true)
    .append("ul")
    .append("li")
    .append("label");
  
  coordSelectContainer.text("coord");
  coordSelectContainer.append("br");
  const coordSelect = coordSelectContainer.append("select")
    .style("width","200px")
    .classed("select2 input-sm",true)
    .attr("id","coordSelect")
    .attr("name","coord");
  
  $('#coordSelect').select2({
    data: coord,
    theme: "bootstrap"
  });
  $('#coordSelect').on('change',updateChart);  
  
  // initialize geometry attributes selection
  $("#geomAttrContainer").empty();
  const attrContainer = d3.select("#geomAttrContainer").classed("container",true).append("ul").selectAll("li").data(geom_attributes)
    .enter().append("li").append("label");
  attrContainer.text(d=>d);
  attrContainer.append("br");
  attrContainer.append("select")
    .style("width","200px")
    .classed("select2 input-sm select2-multiple",true)
    .attr("id", d => d+"attr")
    .attr("name", d => d);
  
  geom_attributes.map(function(attr){
    $('#' + attr + "attr").select2({
      data:fields,
      multiple:true,
      theme: "bootstrap",
    });
    $('#' + attr + "attr").on("select2:select", updateSelect2Order);
    $('#' + attr + "attr").on('change', updateChart);
  });
  
  function getFacet(faced, grammarScript) {
    let facedType = "list";
    let facedScript = ""
    grammarScript = grammarScript.replace(new RegExp(chartScriptName, 'g'),"view");
    if ( faced.length == 2 ) {
        facedType = "rect";
    }
    let facedFields = faced.join("', '")
    facedScript = facedScript + `${ chartScriptName }.facet('${ facedType }', {\n`;
    facedScript = facedScript + `  fields: [ '${ facedFields }' ],\n`;
    facedScript = facedScript + `  eachView(view) {\n`;
    facedScript = facedScript + `    ${ grammarScript };\n`;
    facedScript = facedScript + `  }\n`;
    facedScript = facedScript + `});\n`;
    return facedScript
  }
  
  function getGrammar() {
    let grammar = {}, grammarScript = chartScriptName + ".";
    grammar.geom = $('#geomSelect').val(); 
    grammar.coord = $('#coordSelect').val(); 
    grammar.faced = $('#facetSelect').val(); 
    geom_attributes.map(function(attr){
      grammar[attr] = $('#' + attr + "attr").val();
    });
    
    grammarScript = grammarScript + grammar.geom + "()";
    geom_attributes.map(function(attr){
      if (grammar[attr].length > 0) {
        grammarScript = grammarScript + "." + attr + "('" + grammar[attr].join("*") + "')"; 
      } 
    });
    
    if (grammar.coord) {
      grammarScript = chartScriptName + "." + "coord('" + grammar.coord + "');\n" + grammarScript;
    } else {
      grammarScript = grammarScript + ";";
    }
    
    if ( grammar.faced ) {
      if ( grammar.faced.length == 1 || 
          grammar.faced.length == 2 ) {
        grammarScript = getFacet(grammar.faced, grammarScript);
      } 
    }
    
    console.log(grammarScript)
    return grammarScript;
  }
  
  function updateChart() {
    const grammer = getGrammar();
    try {
      $("#chart").empty();
      let g2chart = new G2.Chart({
        container: 'chart',
        height : 600,
        forceFit: true
      });
      g2chart.source(queryResult);
      eval(grammer);
      g2chart.render();
    } catch (err) {
      //console.log(err);
    }
  }
  
  function updateSelect2Order(evt) {
    let element = evt.params.data.element;
    let $element = $(element);
    $element.detach();
    $(this).append($element);
    $(this).trigger("change");
  }
}

$(document).ready(function () {
  // Prevent the data table pop warning messages
  $.fn.dataTable.ext.errMode = 'none';
  
  const dataSourceList = ["Master", "Iris", "Cars", "Berkeley"];
  //Replace this for your data repo
  const defaultDataRepo = "https://raw.githubusercontent.com/gangtao/dataplay2/master/package/data/";
  const defaultDataPostfix = ".csv";

  // init data source list
  $("#dataSourceSelect").empty();
  d3.select("#dataSourceSelect")
    .selectAll("option")
    .data(dataSourceList)
    .enter()
    .append("option")
    .text(d => d);
  
  $("#dataSourceSelect").change(async function() {
    const selected = $("#dataSourceSelect")
      .find(":selected")
      .text();
    const dataTable = await loadTable( defaultDataRepo + selected + defaultDataPostfix );
    const data = await dataTable.query("SELECT * FROM table");
    updateDataTransform(dataTable);
    rendorDataTable("sourceTableContainer","sourceTable",data);
  });
});

              
            
!
999px

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