- // len0 = unlocked.innerHTML.length;
- var unescaped = unlocked.innerHTML.html_to_matita();
- var parsedtxt = parsed.childNodes[0].wholeText;
- //parsedtxt = unescaped.substr(0,len);
- var unparsedtxt = unescaped.substr(len);
- lockedbackup += parsedtxt;
- locked.innerHTML = lockedbackup;
- unlocked.innerHTML = unparsedtxt.matita_to_html();
- // len1 = unlocked.innerHTML.length;
- // len2 = len0 - len1;
- var len2 = parsedtxt.length;
- metasenv = xml.getElementsByTagName("meta");
- statements = listcons(len2,statements);
- //unlocked.scrollIntoView(true);
- smartScroll();
+ if (len > 0) {
+ // len0 = unlocked.innerHTML.length;
+ var unescaped = unlocked.innerHTML.html_to_matita();
+ var parsedtxt = parsed.childNodes[0].wholeText;
+ //parsedtxt = unescaped.substr(0,len);
+ var unparsedtxt = unescaped.substr(len);
+ lockedbackup += parsedtxt;
+ locked.innerHTML = lockedbackup;
+ unlocked.innerHTML = unparsedtxt.matita_to_html();
+ // len1 = unlocked.innerHTML.length;
+ // len2 = len0 - len1;
+ var len2 = parsedtxt.length;
+ metasenv = xml.getElementsByTagName("meta");
+ statements = listcons(len2,statements);
+ //unlocked.scrollIntoView(true);
+ smartScroll();
+ }