Delete button in calculator app does not work ... which part of my code is wrong

onEvent("backBtn", "click", function(event) { 
  console.log("Delete button clicked");
  click += 1;  
 if(click === 1){
    inputTwo = " ";
    setText("inputdisplay", inputOne + inputTwo);
  }else if(click === 2){
   inputOne = " ";
   firstInput = true;
   setText("inputdisplay", inputOne + inputTwo);
   click = 0;
  }
  });

I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (’).

Hi and welcome to the forum. We’re going to need more information to be able to help you. Can you please share a codepen / repl.it / jsfiddle example of your full code and a more full description of the problem you’re having and what you have tried to fix it so that people can help more easily?