[java] Getting list of items inside div using Selenium Webdriver

Say I have the following

<div class="facetContainerDiv">
    <div>
        <label class="facetLabel">
            <input class="facetCheck" type="checkbox" />
        </label>
        <label class="facetLabel">
            <input class="facetCheck" type="checkbox" />
        </label>
        <label class="facetLabel">
            <input class="facetCheck" type="checkbox" />
        </label>
        <label class="facetLabel">
            <input class="facetCheck" type="checkbox" />
        </label>
        <label class="facetLabel">
            <input class="facetCheck" type="checkbox" />
        </label>
    </div>
</div>

Now I want to put a check mark on the checkbox based on the index I provide. So I write a method like below

How do I access all elements inside the div class="facetContainerDiv" ?

I tried

List<WebElements> elementsList =  driver.findElements(By.cssSelector(".facetContainerDiv"));
for(WebElement checkBox:elementsList) {
    int i=0;
    checkBox = elementsList.get(i);
     bla bla bla..
}

in the above code elementsList has only one element with "type" as null.

You're asking for all the elements of class facetContainerDiv, of which there is only one (your outer-most div). Why not do

List<WebElement> checks =  driver.findElements(By.class("facetCheck"));
// click the 3rd checkbox
checks.get(2).click();

alternatively, you can try writing a specific element:

    //label[1] is the first element.
    el =  await driver.findElement(By.xpath("//div[@class=\"facetContainerDiv\"]/div/label[1]/input")));
    await el.click();

More information can be found here: https://www.browserstack.com/guide/locators-in-selenium

I'm not sure if your findElements statement gets you all the divs. I would try the following:

List<WebElement> elementsRoot = driver.findElements(By.xpath("//div[@class=\"facetContainerDiv\"]/div));

for(int i = 0; i < elementsRoot.size(); ++i) {
     WebElement checkbox = elementsRoot.get(i).findElement(By.xpath("./label/input"));
     checkbox.click();
     blah blah blah
}

The idea here is that you get the root element then use another a 'sub' xpath or any selector you like to find the node element. Of course the xpath or selector may need to be adjusted to properly find the element you want.