javascript - how to add hidden value in joint JS so that the value can be shown when the element is clicked? -

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im confused why doesnt work... first make function:

var member = function (x, y, rank, name, img, background, textcolor, proyek) {      textcolor = textcolor || "#000";      var cell = new joint.shapes.org.member({         position: { x: x, y: y },         attrs: {             '.card': { fill: "#fff", stroke: background },             image: {},                        '.rank': { text: rank, fill: textcolor, 'word-spacing': '3px', 'letter-spacing': 0 },             '.name': { text: name, fill: textcolor, 'font-size': 11, 'font-family': 'calibri', 'letter-spacing': 0, 'text-align': 'left' },             mycustom: proyek         }     });      graph.addcell(cell);     return cell; };

then function called in code... adding of parameter value loop

  var strname = member(positionx2, 200, 'proyek ' + name + ' (' + datalevel[i].total + ') ', '', '#7c68fd', '#000000', datalevel[i].proyek);

then make value shown on alert code...

paper.on('cell:pointerdown',     function (cellview, evt, x, y) {     //    alert('cell view ' + cellview.model.attr('mycustom') + ' clicked');     } );

mycustom undefined.. if change mycustom: proyek mycustom: 'foo' works.. why happening?

can me.. thanks


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