Implementing Cursor-to-End Movement in Kakao Webtoon Search: Using setSelectionRange and setTimeout 0ms

In the Kakao Webtoon search page, when searching for a work with a long title and focusing on the input field, the implementation ensures the cursor moves to the very end of the text rather than the clicked position. Simply adjusting scrollLeft scrolls the view but leaves the cursor at its original position, causing issues with backspace or input.

Using setSelectionRange

To control the cursor position, the HTMLInputElement.setSelectionRange() method was used. Specifying the same index (here, the maximum character count of 50) for selectionStart and selectionEnd allows setting the cursor position rather than selecting a range. At this time, scrollLeft was calculated in units of approximately 30px and adjusted accordingly to visually scroll to the end as well.

Timing Issues and setTimeout Solution

Executing immediately within the focus event listener resulted in a bug where the browser's default click behavior was processed after the callback, causing the cursor to revert to the clicked position. Changing to the mouseup event introduces keyboard accessibility issues, while using setTimeout to delay the callback execution resolves the problem. Even with a delay time of 0ms for setTimeout, the event loop characteristics cause a minimum delay of approximately 4ms, ensuring the cursor position is finalized after the browser's default behavior. Thus, a 0ms delay effectively resolved the timing issues.