问Google Timeline Chart:当多个条形图在同一条线上时，分别为每个条形图着色

EN

dataTable.addRows([
[ 'red/green/blue', 'NAME OF BAR (should be RED) (ff0000)', new Date(1789, 3, 29), new Date(1797, 2, 3) ],
[ 'red/green/blue', 'NAME OF BAR (should be GREEN) (00ff00)', new Date(1796, 2, 3),  new Date(1801, 2, 3) ],
[ 'red/green/blue', 'NAME OF BAR (should be BLUE) (0000ff)',  new Date(1801, 2, 3),  new Date(1809, 2, 3) ]]);

var options = {
    colors: ['#ff0000', '#00ff00', '#0000ff'],
};

(function(){                                            //anonymous self calling function to prevent variable name conficts
    var el=container.getElementsByTagName("rect");      //get all the descendant rect element inside the container      
    var width=100000000;                                //set a large initial value to width
    var elToRem=[];                                     //element would be added to this array for removal
    for(var i=0;i<el.length;i++){                           //looping over all the rect element of container
        var cwidth=parseInt(el[i].getAttribute("width"));//getting the width of ith element
        if(cwidth<width){                               //if current element width is less than previous width then this is min. width and ith element should be removed
            elToRem=[el[i]];
            width=cwidth;                               //setting the width with min width
        }
        else if(cwidth==width){                         //if current element width is equal to previous width then more that one element would be removed
            elToRem.push(el[i]);        
        }
    }
    for(var i=0;i<elToRem.length;i++)
        elToRem[i].setAttribute("fill","none"); //make invisible all the rect element which has minimum width
})();