JSFiddle - React, Tailwind, and code Playground

by someprimetime

HTML

<textarea>This is a **text**.</textarea>

<button type="button" id="btn-bold">
  Bold
</button>


<textarea id="your_textarea"></textarea>

<button type="button" id="wat">
Testing
</button>

JavaScript

$('#btn-bold').on('click', function() {
  var textarea = $('textarea')[0];
  getCaretPosition(textarea);
  console.log(getCaretPosition(textarea));
  console.log(getSurroundingSelection(textarea));
})

function getCaretPosition(textarea) {
  return textarea.selectionStart
}

function getSurroundingSelection(textarea) {
  return [textarea.value.substring(0, textarea.selectionStart), textarea.value.substring(textarea.selectionStart, textarea.selectionEnd), textarea.value.substring(textarea.selectionEnd, textarea.value.length)]
}











function getInputSelection(el) {
    var start = 0, end = 0, normalizedValue, range,
        textInputRange, len, endRange;

    if (typeof el.selectionStart == "number" && typeof el.selectionEnd == "number") {
        start = el.selectionStart;
        end = el.selectionEnd;
    } else {
        range = document.selection.createRange();

        if (range && range.parentElement() == el) {
            len = el.value.length;
            normalizedValue = el.value.replace(/\r\n/g, "\n");

            // Create a working TextRange that lives only in the input
            textInputRange = el.createTextRange();
            textInputRange.moveToBookmark(range.getBookmark());

            // Check if the start and end of the selection are at the very end
            // of the input, since moveStart/moveEnd doesn't return what we want
            // in those cases
            endRange = el.createTextRange();
            endRange.collapse(false);

            if (textInputRange.compareEndPoints("StartToEnd", endRange) > -1) {
                start = end = len;
            } else {
                start = -textInputRange.moveStart("character", -len);
                start += normalizedValue.slice(0, start).split("\n").length - 1;

                if (textInputRange.compareEndPoints("EndToEnd", endRange) > -1) {
                    end = len;
                } else {
                    end = -textInputRange.moveEnd("character", -len);
    ...