function _ctRenderHtmlToPdf(htmlText, baseName) {
        var goBtn = document.getElementById('html-to-pdf-go');
        if (goBtn) { goBtn.disabled = true; goBtn.textContent = 'Generating PDF...'; }
        loadScriptPromise('https://cdnjs.cloudflare.com/ajax/libs/html2pdf.js/0.10.2/html2pdf.bundle.min.js').then(function() {
            var container = document.createElement('div');
            container.style.cssText = 'padding:24px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;color:#212529;line-height:1.5;max-width:780px;';
            container.innerHTML = htmlText;
            html2pdf().set({
                margin: 10,
                filename: baseName + '.pdf',
                image: { type: 'jpeg', quality: 0.95 },
                html2canvas: { scale: 2, useCORS: true },
                jsPDF: { unit: 'pt', format: 'a4', orientation: 'portrait' }
            }).from(container).outputPdf('blob').then(function(blob) {
                add_file_output(URL.createObjectURL(blob), baseName + '.pdf');
                if (goBtn) { goBtn.disabled = false; goBtn.innerHTML = '<i class=\"fa fa-file-pdf\"></i> &nbsp;Convert to PDF'; }
            }).catch(function(err) {
                alert('Could not render this HTML as PDF: ' + (err && err.message || err));
                if (goBtn) { goBtn.disabled = false; goBtn.innerHTML = '<i class=\"fa fa-file-pdf\"></i> &nbsp;Convert to PDF'; }
            });
        }).catch(function() {
            alert('Could not load the PDF library.');
            if (goBtn) { goBtn.disabled = false; goBtn.innerHTML = '<i class=\"fa fa-file-pdf\"></i> &nbsp;Convert to PDF'; }
        });
    }

    // No-op on every keystroke; user clicks the Convert button to render.
    function convert(input) { return ''; }

    $(function() {
        $('#html-to-pdf-go').off('click').on('click', function() {
            var input = $('#box1').val();
            if (!input || !input.trim()) {
                alert('Paste some HTML in the box first.');
                return;
            }
            _ctRenderHtmlToPdf(input, 'html-document');
        });
    });







var _loadedScripts = {};
function loadScriptPromise(url) {
    if (_loadedScripts[url]) return _loadedScripts[url];
    _loadedScripts[url] = new Promise(function (resolve, reject) {
        var s = document.createElement('script');
        s.src = url;
        s.onload = resolve;
        s.onerror = reject;
        document.head.appendChild(s);
    });
    return _loadedScripts[url];
}

function replaceAll(find, replace, str) {
    return str.replace(new RegExp(find, 'g'), replace);
}

function beautify(str) {


    var result = '';

    var length = str.length;

    var i = 0;

    var braceCountLeft = 0;
    var braceCountRight = 0;

    var withinQuotes = false;

    while (i < length) {

        var c = str[i];

        if (c == '"' && (i == 0 || c[i - 1] != '\\')) {
            // non-escaped quotes
            withinQuotes = !withinQuotes;
        }

        if (!withinQuotes && (c == '}' || c == '{' || c == ',')) {

            console.log('Start####' + result);

            // look back and remove carriage returns and whitespace that are already there

            var resultIndex = result.length - 1;
            while (resultIndex >= 0 && (result[resultIndex] == ' ' || result[resultIndex] == '\r' || result[resultIndex] == '\n' || result[resultIndex] == '\t')) {

                resultIndex = resultIndex - 1;
                result = result.substr(0, resultIndex + 1);

                console.log('char ' + result[resultIndex] + '-----' + result + 'zzz ' + result.length + ' ' + resultIndex);

            }


            if (c == '{') {
                braceCountLeft++;
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            } else if (c == '}') {
                braceCountRight++;
                // precede with carriage return
                result += '\r' + GetTabs(braceCountLeft - braceCountRight) + c;
            } else if (c == ',') {
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            }

            var nextChar = '';

            // advance through whitespace and remove carriage returns that are already there
            while (i < length && (str[i + 1] == ' ' || str[i + 1] == '\r' || str[i + 1] == '\n' || str[i + 1] == '\t')) {
                i++;
            }

        } else {

            result += str[i];

        }


        i++;

    }

    return result;

}

function GetTabs(count) {

    var result = '';

    for (var i = 0; i < count; i++) {
        result += '    ';
    }

    return result;

}