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Confirm an element must not to have attribute

In the case when you want to confirm an element must not to have a specified attribute.

Change the values written below.

  • selector: A string of a selector to pinpoint the element.
  • attrName: A string of the attribute which you want to assert its value.
  • errMessage: A string of the error message which you want to show when it fails. It will be a default string if you don’t change from <TODO: REPLACE>.
var selector = "<TODO: REPLACE>";
var attrName = "<TODO: REPLACE>";
var errMessage = "<TODO: REPLACE>";

/* --------- You don't need to touch below --------------- */

/* Locate the element */
var element = document.querySelector(selector);

/* Stop process if it does not exist */
if (!element) {
  throw new Error(
    "Error: cannot find the element with selector(" + selector + ")."

/* check the if the element has the specified attribute */
if (element.hasAttribute(attrName)) {
  if (errMessage == "<TODO: REPLACE>") {
    errMessage =
      'Error: This element is expected not to have "' +
      attrName +
      '", but it does.';

  throw new Error(errMessage);