Click on element if exists - uiveri5

Question

I want to use setInterval and to try for five times to check if element exists (a button). If it exists, I want to click it and to proceed after it and, if not, I want to just proceed.
How to do so?

Answer 1

This is not the correct way with webdriver that is the underlying API in UIVeri5. The right way is to use the browser.driver.wait() with a predicate that checks for the condition.
But such polling should not be necessary at all with UIVeri5 when working against a UI5 application because UIVeri5 handles the waiting automatically. With the limitation that this magic works only in UI5 apps because it depends on the UI5 runtime to detect when the UI5 app is ready. So when writing tests for UI5, you don't need any pollings, you just write element(by.control()).isDisplayed() and it works fine and perfectly reliable. The check will happen at the correct time - when ui5 app is fully rendered and no polling is necessary.

Answer 2

Based on #Max, I am just writing the answer in a more dummy proof way:
If one needs to check if a button or something else is displayed, isDisplayed() should be called. isDisplayed() is a promise and, if the element is displayed, then in the then() resolution the continuation should be called. If the element is not displayed, the callback should be called in the catch() resolution of the promise.
Example:
iCheckForElementAndContinue: function(callback) {
element.isDisplayed()
.then({
// Element is found
if (callback) {
callback();
}
})
.catch({
// Element is not found
if (callback) {
callback();
}
});
}