javascript - d3 updates new elements transition in -

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i have barchart updating fine this:

var bar=chart.selectall(".bar")           .data(data);   bar.enter().append("rect")           .attr("class", "bar")           .attr("x", function(d) { if(scale(d.values.total)<0){return width/2+widthdatelabel;}else{return width/2-scale(d.values.total)-widthdatelabel;}})           .attr("width", function(d) { return math.abs(scale(d.values.total)); })           .attr("height", barheight - 1)           .attr("fill", function(d) { if(scale(d.values.total)<0){ return "deeppink"}else{return "mediumseagreen"}})           .attr("transform", function(d, i) { return "translate(0," + * barheight + ")"; });   bar.exit()     .transition().duration(750)     .attr("transform", function(d, i) { return "translate(0," + (i + 1) * barheight + ")"; })     .style("opacity", 0)     .remove();   bar     .transition().duration(750)       .attr("height", barheight - 1)       .attr("x", function(d) { if(scale(d.values.total)<0){return width/2+widthdatelabel;}else{return width/2-scale(d.values.total)-widthdatelabel;}})       .attr("width", function(d) { return math.abs(scale(d.values.total)); })       .attr("fill", function(d) { if(scale(d.values.total)<0){ return "deeppink"}else{return "mediumseagreen"}})       .attr("transform", function(d, i) { return "translate(0," + * barheight + ")"; });

update works fine. transition also. when there new bars added appear in place should appear , not have transition (e.g., opacity change, or delay before appears). there way can differentiate between new data transition , updating data transition? looks pretty ugly , cannot believe how d3 things. there must workaround this. in advance!

thanks @thisoneguy gave hint opacity. started understanding "setup" means inital before transition, affects newly added elements in update. here solution (i went opacity change + new elements coming bottom):

var bar=chart.selectall(".bar")           .data(data);   bar.enter().append("rect")           .attr("class", "bar")           .attr("x", function(d) { if(scale(d.values.total)<0){return width/2+widthdatelabel;}else{return width/2-scale(d.values.total)-widthdatelabel;}})           .attr("width", function(d) { return math.abs(scale(d.values.total)); })           .attr("height", barheight - 1)           .attr("opacity", 0)           .attr("fill", function(d) { if(scale(d.values.total)<0){ return "deeppink"}else{return "mediumseagreen"}})           .attr("transform", function(d, i) { return "translate(0," + (i+math.abs(monthlengthdiff)) * (barheight) + ")"; });   bar.exit()     .transition().duration(750)     .attr("transform", function(d, i) { return "translate(0," + (i + 1) * barheight + ")"; })     .style("opacity", 0)     .remove();   bar     .transition().duration(750)       .attr("height", barheight - 1)       .attr("x", function(d) { if(scale(d.values.total)<0){return width/2+widthdatelabel;}else{return width/2-scale(d.values.total)-widthdatelabel;}})       .attr("width", function(d) { return math.abs(scale(d.values.total)); })       .attr("fill", function(d) { if(scale(d.values.total)<0){ return "deeppink"}else{return "mediumseagreen"}})       .attr("transform", function(d, i) { return "translate(0," + * barheight + ")"; })       .attr("opacity", 1)

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