No such element Exception. class name with double__ - selenium

Question

I am trying to get the text under the tag. That is Arduus, Gstaad, Switzerland. I tried with the classname and also with xpath.
driver.findElement(By.className("chalet-details__title"));
String chaletTitle = driver.findElement(By.xpath("//div/h1[#class='chalet-details_title']")).getText();
But its giving NoSuchElementException. The classname has double underscore(__) .Is it because of that not working? Can anyone help me with this?
<div class="col-md-12 col-sm-12 col-xs-12">
<h1 class="chalet-details__title">
<span class="chalet-details__title-property">Arduus</span>,
<a class="chalet-details__title-resort" href="/ski- resorts/switzerland/gstaad">Gstaad</a>,
<a class="chalet-details__title-country" href="/ski- resorts/switzerland">Switzerland</a>
</h1>
<div class="chalet-details__rating">
<div class="chalet-details__wrapper">
<span class="chalet-details__star" style="width: 108px;"></span>
<span class="chalet-details__mask"></span>
</div>
</div>
</div>

Answer 1

You can try something like:
driver.findElement(by.cssSelector("h1.chalet-details__title"))
I just tried this and it worked fine with the provided html, if this still fails for you, can you verify that there aren't any iframes on the page.

Answer 2

Both your locators are OK, but you might need to wait for your element to be present in DOM:
WebDriverWait wait= new WebDriverWait(driver,20 );
String chaletTitle = wait.until(ExpectedConditions.presenceOfElementLocated(By.className("chalet-details__title"))).getText();
Another reason for NoSuchElementException: your element could be located inside an iframe, so you need to switch to that frame before handling target element:
driver.switchTo().frame("iframeNameOrId");
If it has no attributes as id or name:
WebElement someFrame = driver.findElement(By.xpath("//iframe[#someAttr='someValue']"));
driver.switchTo().frame(someFrame);

Answer 3

To get all the text under h1 tag find all elements using locator as follows:
List<WebElement> items = driver.findElements(By.cssSelector("h1.chalet-details__title > *")); //it will find all elements immediately under the h1 tag
Now, iterate over the elements.
Complete code:
List<WebElement> items = driver.findElements(By.cssSelector("h1.chalet-details__title > *"));
for(WebElement item : items){
System.out.println(item.getText());
}