bootstrap dropdown menu on click example

Example 1: create a dropdown in html bootstrap

<div class="dropdown">
  <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenu2" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    Dropdown
  </button>
  <div class="dropdown-menu" aria-labelledby="dropdownMenu2">
    <button class="dropdown-item" type="button">Action</button>
    <button class="dropdown-item" type="button">Another action</button>
    <button class="dropdown-item" type="button">Something else here</button>
  </div>
</div>

Example 2: dropdowns

There are 2 dropdowns
1- HTML
2- SELECT

we determine what kind of dropdown it is
 -By tagName.We inspect.If it has <select> tag, it means it is <select> dropdown. 
 -If it is HTML, we can locate and click just as any other web element.
 
 I handle Select type of dropdown by using Select class from Selenium. 
    - Methods to select from dropdown:
        - selectByVisibleText
        - selectByValue
        - selectByIndex 
        
I verify which option is selected in a dropdown?
 - If we want to get the currently selected option, 
 we use getFirstSelectedOption() method.
        -> return type: currently selected option as a web element
        
--> .getOptions();
    -> This method will return all of the options in the <select> web element.
    -> return type: List<WebElement>

Example 3: on click drop down bootstrao

<p>
  <a class="btn btn-primary" data-toggle="collapse" href="#collapseExample" role="button" aria-expanded="false" aria-controls="collapseExample">
    Link with href
  </a>
  <button class="btn btn-primary" type="button" data-toggle="collapse" data-target="#collapseExample" aria-expanded="false" aria-controls="collapseExample">
    Button with data-target
  </button>
</p>
<div class="collapse" id="collapseExample">
  <div class="card card-body">
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  </div>
</div>