React error due to setting div scroll height on component mount

In my code, there is a special div/container that contains multiple <p/> tags. The container has a reference called divRef, which is initially set to null using the useRef function.

<div ref={divRef} style={styles.messageListContainer}>
            <p>Placeholder</p>
            // more <p/> tags here
      </div>

The CSS styling for this container is defined as follows:

messageListContainer: {
    height: '100vh`,
    width: '100%',
    paddingBottom: 20,
    flexDirection: "column",
    display: "flex",
    overflow: "auto",
},

When the page loads, I want the content inside the div to be automatically scrolled to the bottom, allowing users to scroll upwards to see previous content. To achieve this without a visible scrolling animation, I refrain from using scrollIntoView.

I attempted to implement this behavior using a useEffect hook, but encountered an error:

Cannot read properties of null (reading 'scrollHeight')
. What could be causing this error, and how can I achieve the desired outcome?

Code snippet for setting automatic scroll at the bottom of the div:

   useEffect(() => {
        divRef.current.scrollTop = divRef.current.scrollHeight
    }, [])

Answer №1

One reason for this behavior is that the useEffect function executes before the component finishes rendering, resulting in a situation where the div may not even exist yet. To prevent errors, it is important to verify the presence of the divRef before attempting to use it.

Include divRef in the dependency array and ensure that divRef.current is defined before accessing it.

useEffect(() => {
   if (divRef.current) {
      divRef.current.scrollTop = divRef.current.scrollHeight;
   }
}, [divRef])

Furthermore, you can make use of the element.scrollIntoView() method with additional options to enable instant scrolling:

useEffect(() => {
   if (divRef.current) {
      divRef.current.scrollIntoView({
         behavior: 'instant',
         block: 'end'
      })
   }
}, [divRef])

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