You're missing an important keyword, 'await'. I'll try to explain.
var elem = await dvr.findElement(By.xpath("//tr[contains(.,'xxx')]"));
This will let the findElement function finish executing and return the
element object, then assign it to 'elem'. Without the 'await' keyword,
'elem' is a Promise object which doesn't have a method called 'isEmpty'.
It's probably instructive to see what a Promise'd function looks like in
practice. Let's write a function that waits 1 second, and returns the sum
of its parameters.
function addUs(a, b){
return new Promise( (accept) => {
setTimeout( () => {
accept(a+b);
}, 1000);
});
}
The function returns right away, but it's not actually done executing until
the accept() method is called. The findElement call does much the same. To
use this function, let's use the async/await pattern:
async function runAddUs(){
console.log(addUs(1, 2)); // outputs Promise object; not super
helpful
console.log(await addUs(3, 4)); // outputs '7'; that's what we want
}
runAddUs();
You'll notice that the first addUs call returns immediately and the
console.log output will happen immediately. It will display information
about the Promise object, but the addUs call isn't actually complete (the
Promise is in 'pending' state). Then 1 second later the second console.log
will output the number 7. Your findElement code above is more like the
first addUs(1, 2) call here. 'elem' is assigned the value of the Promise
object, not the value of the result of findElement. In JavaScript, the
functions are *executed* in order, but they may not finish running in that
same order. This is the nature of asynchronous vs. procedural programming.
It's quite possible to write asynchronous code in many languages, but with
JavaScript it's the default.
Best,
Mikkel
Oblivious.io <https://www.oblivious.io/?r=googlenode>
On Thursday, September 6, 2018 at 9:05:35 AM UTC-7, siva prasad wrote:
>
> I have tried this too.
>
> This is my code block:
>
> var elem = dvr.findElement(By.xpath("//tr[contains(.,'xxx')]"));
> if (elem.isEmpty()){
> console.log('Not displayed' + i);
> //count++;
> dvr.findElement(By.xpath("//a[contains(.,'ยป')]"));
> }
> else {
> console.log('Displayed in page' + i);
> dvr.findElement(By.xpath("//tr[contains(.,'xxx')]/td[3]/a"));
> dvr.switchTo().alert().accept();
> }
>
>
> This is the error I get:
> elem.isEmpty is not a function
>
> Why is this happening?
>
>
> On Monday, 3 September 2018 12:04:30 UTC+5:30, siva prasad wrote:
>>
>> I am fairly new to the JS scripting.
>> Started using JS for end-to-end test case automation.
>>
>> I am facing an issue here.
>>
>> *Issue: *
>> UnhandledPromiseRejectionWarning: NoSuchElementError: no such element:
>> Unable to locate element: {"method":"link text","selector":"Business
>> Continuity"}
>> (Session info: chrome=68.0.3440.106)
>> (Driver info: chromedriver=2.35.528157
>> (4429ca2590d6988c0745c24c8858745aaaec01ef),platform=Mac OS X 10.13.2 x86_64)
>> at Object.checkLegacyResponse
>> (/Users/sivaprasad/node_modules/selenium-webdriver/lib/error.js:585:15)
>> at parseHttpResponse
>> (/Users/sivaprasad/node_modules/selenium-webdriver/lib/http.js:533:13)
>> at Executor.execute
>> (/Users/sivaprasad/node_modules/selenium-webdriver/lib/http.js:468:26)
>> at <anonymous>
>> at process._tickCallback (internal/process/next_tick.js:188:7)
>> (node:25855) UnhandledPromiseRejectionWarning: Unhandled promise
>> rejection. This error originated either by throwing inside of an async
>> function without a catch block, or by rejecting a promise which was not
>> handled with .catch(). (rejection id: 1)
>> (node:25855) [DEP0018] DeprecationWarning: Unhandled promise rejections
>> are deprecated. In the future, promise rejections that are not handled will
>> terminate the Node.js process with a non-zero exit code.
>>
>> *Code:*
>>
>> driver.findElement(By.id('username')).sendKeys('xxx');
>> driver.findElement(By.id('password')).sendKeys('xxx');
>> driver.findElement(By.id('submit')).click();
>> driver.findElement(By.linkText('Business Continuity')).click();
>>
>> I know there is something called Promise handling. Just that I am not
>> able to get my head around it. Someone help me.
>>
>
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