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getElementById on other function when element was created sooner by other function [duplicate]

I create a div with id, class and a button in it

After created, i want to manipulate it, so i use getElementById

It work in the function where it be created but cannot use it on other function.

Error : "Uncaught TypeError: Cannot set property 'onclick' of null"

function ManageButton() {

          var divManage = document.createElement('div');
          divManage.classList.add('ol-opt');
          divManage.classList.add('ol-unselectable');
          divManage.classList.add('ol-control');
          divManage.classList.add('ol-opt-expand');
          divManage.setAttribute("id", "dbm");
          document.querySelector("#map").appendChild(divManage);
          var but = document.createElement('button');
          but.classList.add('opt-button');
          but.type = "button";
          but.title = "Manage options";
          var text = document.createTextNode('⌥');
          but.appendChild(text);
          document.getElementById('dbm').appendChild(but);

};

        document.body.onload = ManageButton;

Error line :

document.getElementById('dbm').onclick = ManageEvent;
Via Active questions tagged javascript - Stack Overflow https://ift.tt/2FdjaAW
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