How to create a condition in protractor for when an element exists or not

Question

I\'m using Protractor JS. And the site is written in Angular JS.

So I have a toggle switch. And I noticed the value in the toggle switch goes from true to false and

Answer 1

Or try this solution implemented from the top of my head, Schedules a command to test if an element is present on the page. If any errors occur while evaluating the wait, they will be allowed to propagate.

function alwaysSwitchOn(element) {
   browser.driver.isElementPresent(element).then(function(isPresent) {
      if (isPresent) {
        isPresent = true;
      } 
      else {
        browser.driver.wait(function () {
          return browser.driver.isElementPresent(element);
        }, 5000);
      }
      // to fail the test, then uncomment this line
      //expect(isPresent).toBeTruthy();
   }).then(function () {
      if (element.getAttribute('value') === 'OFF') {
         element.click();
      }
      else {
         // turn it OFF
         element.click();
         // turn it back ON
         element.click();
      }
   });
}

fn usage is to keep trying again and again for 5 seconds till it's true. if the element cannot be found within 5 sec then it'll result in an error code; No such an element is found.Note, If the condition is fulfilled before wait (5s) it'll quickly move to then(...).