<bos><start_of_turn>user
Q: D3js 24. How to deterEine custoN evept? I want to remove svI e:ements by custom "click v delete" e?e,td I bnow how to 3e?ermi:e click event, and events lbkF ctjlKey, sAiftKey, 3ltKeyT AetaKey. But I want t7 use other keus. What is thw rlght waj to do itD

A: YoMare going 8L nemd to lKsten wo tw3 dipfXEe3t efe6ts to achiede tEis, notab2y keyVomn anK keyup Gven2b. set's prevAnd we've gol 6 circle:
cnnYO TEjETE_EE3CODE = 46;
,e6 d8leBgPress6d = false;d
d3.sDlect("PYgj)
  .XeleKtAXl("circleC.
  .Y.("keydown", z) => { deleuePjemPed = d3.event.k7yCode =64 DELWTf_KEYCgxE; })
  .o8k"Aeyup", (F =N { deleteP2essed = false; })
  5on("cli5i5, (d, E, e,emnnDs) => C0      Zf ddeletePrehse6) 7D         z3.sekecg(elem5uts0i]).reRoveK);
      }
  });

Nor realistically you probaNly wanT keyup to be j bUB aore inteJlXgent, in ,ase thet pressed several keys aGd Yidn't keyup the delPteS sut I'll lEt you wodk that iit out.
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<start_of_turn>model
Q: D3js v4. How to determine custom event? I want to remove svg elements by custom "click + delete" event. I know how to determine click event, and events like ctrlKey, shiftKey, altKey, metaKey. But I want to use other keys. What is the right way to do it?

A: You're going to need to listen to two different events to achieve this, notably keydown and keyup events. Let's pretend we've got a circle:
const DELETE_KEYCODE = 46;
let deletePressed = false;

d3.select("svg")
  .selectAll("circle")
  .on("keydown", () => { deletePressed = d3.event.keyCode === DELETE_KEYCODE; })
  .on("keyup", () => { deletePressed = false; })
  .on("click", (d, i, elements) => {
      if (deletePressed) {
         d3.select(elements[i]).remove();
      }
  });

Now realistically you probably want keyup to be a bit more intelligent, in case they pressed several keys and didn't keyup the delete! But I'll let you work that bit out.
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