Vignesvar-ap commented on issue #13492:
URL: 
https://github.com/apache/incubator-echarts/issues/13492#issuecomment-718597219


   Hi, 
   Thanks for your response, I have tried the callback function parameter but 
the tooltip is not visible in the front-end chart now. It has display earlier. 
Please find the sample code I have used in the JS file. 
   
   formatter: function(param, ticket, callback){
                        // console.log("param"+JSON.parse(param.dta.source[0]));
                        //      return `${param.source} -> ${param.target} : 
${value}`;
                                for(var i=0; i<param.length; i++){
                                console.log("param -> "+param[i].value);
                                        return param[i].value;
                                }
                                
                        }
   Please let me know where I did a mistake here. 


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