javascript - Event when I assign a cell like source/target on a link? -


i use default links , want restrict source , target links because want links between rect(source) , circle(target).

i have tried link.on(change:source) , link.on(change:target) events don't launch when want.

somebody knows solution problem?

    var defaultlinks =  new joint.dia.link({             attrs: {                 '.marker-source': {transform: 'scale(0.001)' },                 '.marker-target': {fill:'black', d: 'm 10 0 l 0 5 l 10 10 z' },                 '.connection-wrap': {                     stroke: 'black'                 }             },             smooth:true,             path: []     });     defaultlinks.on('change:source',function(){         alert("change source")     });     defaultlinks.on('change:target',function(){         alert("change source")     });      this.paper = new joint.dia.paper({         el: this.paperscroller.el,         width: 1200,         height: 1000,         gridsize: 10,         perpendicularlinks: true,         model: this.graph,         defaultlink: defaultlinks     });

you can use validateconnection(cellviews, magnets, cellviewt, magnett, end, linkview) function in paper options (http://jointjs.com/api#joint.dia.paper). tutorial shows usage: http://jointjs.com/tutorial/ports#restrict. in case, use (not tested):

var paper = new joint.dia.paper({      validateconnection: function(cellviews, magnets, cellviewt, magnett, end, linkview) {         // rectangle can source, if not, not allow such connection:         if (cellviews.model.get('type') !== 'basic.rect') return false;         // circle can target, if not, not allow such connection:         if (cellviewt.model.get('type') !== 'basic.circle') return false;         // connection allowed otherwise.         return true;     },     ... })

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