如何通过class和id名称获取元素

Question

I have a javascript code like this:

var confirmbutton = document.getElementsByClassName("btn-primary-md");
for (var y=0;y<confirmbutton.length; y++) 
  {
  confirmbutton[y].click();
//...

Im trying to make a javascript which would press a specific button with the same class and id with the below html.

<a href="" id="confirm-btn" class="btn-primary-md">Get it Now</a>

but it keeps there is another class with the same class name which keeps getting pressed:

<a href="https://example.com" class="btn-primary-md">Upgrade Now</a>

How do I get

<a href="https://example.com" class="btn-primary-md">Upgrade Now</a>

to work with my javascript?

Answer 1

You can get the button both by ID and class by using document.querySelectorAll :

 let confirmButtons = document.querySelectorAll("#confirm-btn.btn-primary-md"); for (let i = 0; i < confirmButtons.length; i++) { console.log("The button text is: " + confirmButtons[i].innerText); }

 <a href="" id="confirm-btn" class="btn-primary-md">Get it Now</a> <a href="https://example.com" class="btn-primary-md">Upgrade Now</a>

However, as @Andy already suggested in the comments, you better get your button by ID only (assuming your IDs are unique on the page).