How to get Element by XPATH in JavaScript?

Question

I have a very basic code. It simply changes the style of the button on click. It works fine when used getElementById but I wanna do it the XPATH way. I'm new to JavaScript. What I'm doing wrong and how can I achieve this?

The code:

<!DOCTYPE html>
<html>
<body>

<p id="demo">Click the button to change the layout of this paragraph</p>

<button onclick="myFunction()">Click Me!</button>

<script>
function myFunction() {
  let x = document.getElementByXpath("//html[1]/body[1]/button[1]");
  x.style.fontSize = "25px"; 
  x.style.color = "red"; 
}
</script>

</body>
</html>

there is no document.getElementByXpath developer.mozilla.org/en-US/docs/Web/API/Document/evaluate — epascarello
– epascarello, Commented Oct 28, 2021 at 12:58
Does this answer your question? Is there a way to get element by XPath using JavaScript in Selenium WebDriver? — Asalan
– Asalan, Commented Dec 10, 2022 at 23:54

Alan Yu · Accepted Answer · 2021-10-28 13:02:25Z

16

Look at document.evaluate()

function getElementByXpath(path) {
  return document.evaluate(path, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
}

function myFunction() {
  let x = getElementByXpath("//html[1]/body[1]/button[1]");
  x.style.fontSize = "25px"; 
  x.style.color = "red"; 
}

<p id="demo">Click the button to change the layout of this paragraph</p>

<button onclick="myFunction()">Click Me!</button>

answered Oct 28, 2021 at 13:02

Alan Yu

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2 Comments

Abhay Salvi Over a year ago

Hey! Thanks for this. It worked! However, I've a question tho. What does .singleNodeValue do? Can you explain the code?

Alan Yu Over a year ago

@Abhaysalvi singleNodeValue

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