Help with a "Read more" button

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Code for the “Show More/Show Less” Toggle Button with Dynamic Text:

let fullText; // variable to hold the full text
let shortText; // variable to hold the short version of the text

$w.onReady(function () {
$w("#dynamicDataset").onReady(function () {
// how many characters to include in the shortened version
const shortTextLength = 40;
// set the fullText variable to be the text from the collection
fullText = $w('#dynamicDataset').getCurrentItem().textField;
// if no text to display, collapse the text element and the button
if (!fullText) {
$w('#myTextElement').collapse();
$w('#myButton').collapse();
} else {
// if the text has fewer or the same number of characters as shortTextLength characters, display it as is and collapse the "Show More" button
if (fullText.length <= shortTextLength) {
$w('#myTextElement').text = fullText;
$w('#myButton').collapse();
} else {
// create the shortened version of the text and display it in the text element
shortText = fullText.substr(0, shortTextLength) + "...";
$w('#myTextElement').text = shortText;
}
}
});
});

export function mybutton_click(event, $w) { //making sure that you have added the onClick event in properties
// check the contents of the text element
if ($w("#myTextElement").text === shortText) {
// if currently displaying short text, display the full text
$w("#myTextElement").text = fullText;
$w("#myButton").label = "Show less";
} else {
// if currently displaying full text, display the short text
$w("#myTextElement").text = shortText;
$w("#myButton").label = "Show more";
}
}