Better error reporting for external Markdown files
1. Show an alert when loading the file throws an exception 2. Whenever the status isn't success (2xx) - upon exception or e.g. "file not found" - replace the section's content with information about the failure (instead of being silent about it and showing a blank slide). We need to inform the user something went wrong, not just be silent about it. An experienced developer, upon seing a blank slide, will likely check the javascript console - but the rest will profit from being told about the problem (and solution) explicitely.
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@ -101,12 +101,21 @@
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xhr.onreadystatechange = function () {
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if( xhr.readyState === 4 ) {
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if (xhr.status >= 200 && xhr.status < 300) {
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section.outerHTML = slidifyMarkdown( xhr.responseText, section.getAttribute('data-separator'), section.getAttribute('data-vertical') );
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} else {
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section.outerHTML = '<section data-state="alert">ERROR: The attempt to fetch ' + url + ' failed with the HTTP status ' + xhr.status +
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'. Check your browser\'s JavaScript console for more details.</section>';
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}
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}
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};
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xhr.open('GET', url, false);
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try {
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xhr.send();
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} catch (e) {
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alert('Failed to get the Markdown file ' + url + '. Make sure that the presentation and the file are served by a HTTP server and the file can be found there. ' + e);
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}
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} else if( section.getAttribute('data-separator') ) {
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