javascript - Disable line that appears on a legend click for Google Line Chart -


whenever series gets clicked on legend in google line chart, seems line appears above data trendline. possible stop behavior? not find in docs.

an example of this: red trendline has line above it

when legend clicked, entire series selected,
means row value null

chart.getselection() return like...

{row: null, column 1}

vs. when data point clicked / selected, row have number reference row: 1, etc...

as such, use 'select' event listener , cancel selection when row null

chart.setselection([]);

see following working snippet... 

google.charts.load('current', {    callback: function () {      var container = document.getelementbyid('chart_div');      var chart = new google.visualization.linechart(container);        var datatable = new google.visualization.datatable();      datatable.addcolumn({type: 'string', label: 'year'});        // series 0      datatable.addcolumn({type: 'number', label: 'category a'});      datatable.addcolumn({type: 'string', role: 'tooltip', p: {html: true}});        // series 1      datatable.addcolumn({type: 'number', label: 'category b'});      datatable.addcolumn({type: 'string', role: 'tooltip', p: {html: true}});        // series 2      datatable.addcolumn({type: 'number', label: 'category c'});      datatable.addcolumn({type: 'string', role: 'tooltip', p: {html: true}});        datatable.addrows([        ['2014', 1000, null, 2000, null, 3000, null],        ['2015', 2000, null, 4000, null, 6000, null],        ['2016', 3000, null, 6000, null, 9000, null],      ]);        (var = 0; < datatable.getnumberofrows(); i++) {        datatable.setvalue(i, 2, gettooltip(i, 1));        datatable.setvalue(i, 4, gettooltip(i, 3));        datatable.setvalue(i, 6, gettooltip(i, 5));      }        function gettooltip(rowindex, columnindex) {        return '<div class="ggl-tooltip"><span>' +          datatable.getvalue(rowindex, 0) + ': </span>' +          datatable.getformattedvalue(rowindex, columnindex) + '</div>';      }        // use 'select' listener disable selection on legend click      google.visualization.events.addlistener(chart, 'select', function () {        var selection = chart.getselection();        if (selection.length > 0) {          if (selection[0].row === null) {            chart.setselection([]);          }        }      });        chart.draw(datatable, {        legend: {          position: 'bottom'        },        pointsize: 4,        tooltip: {          ishtml: true        }      });    },    packages: ['corechart']  });
.ggl-tooltip {    border: 1px solid #e0e0e0;    font-family: arial, helvetica;    font-size: 10pt;    padding: 12px 12px 12px 12px;  }    .ggl-tooltip span {    font-weight: bold;  }
<script src="https://www.gstatic.com/charts/loader.js"></script>  <div id="chart_div"></div>


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