Show more/less button

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Make sure that your code is complete and not missing anything as this line is wrong in your code:

shortText = fullText.substr(100) + "...";

Code for the “Show More” Button:

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

$w.onReady(function () {
// how many characters to include in the shortened version
const shortTextLength = 40;  // you can change this number
// read the full text and store it in the fullText variable
fullText = $w("#myTextElement").text;
// grab the number of characters defined in shortTextLength and store them in the shortText variable
shortText = fullText.substr(0, shortTextLength) + "...";
// set the contents of the text element to be the short text
$w("#myTextElement").text = shortText;
});

export function mybutton_click(event, $w) { //make sure you have added the onClick event in properties
// display the full text
$w("#myTextElement").text = fullText;
// collapse the button
$w("#myButton").collapse();
}

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

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

$w.onReady(function () {
// how many characters to include in the shortened version
const shortTextLength = 40;  // you can change this number
// read the full text and store it in the fullText variable
fullText = $w("#myTextElement").text;
// grab the number of characters defined in shortTextLength and store them in the shortText variable
shortText = fullText.substr(0, shortTextLength) + "...";
// set the contents of the text element to be the short text
$w("#myTextElement").text = shortText;
});

export function mybutton_click(event, $w) { //make sure you have added the onClick event in properties
// check the contents of the text element 
if ($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";
}
}