javascript - validate text box input (for fasta format) before submission -


i want validate text box input on html page whether in fasta format or not , if contains 1 sequence before submission of data.

i know php , little idea javascript. don't think possible php.

in order validate using javascript, can use following function:

/*  * validates (true/false) single fasta sequence string  * param   fasta    string containing putative single fasta sequence  * returns boolean  true if string contains single fasta sequence, false   *                  otherwise   */ function validatefasta(fasta) {      if (!fasta) { // check there first of         return false;     }      // remove trailing spaces     fasta = fasta.trim();      // split on newlines...      var lines = fasta.split('\n');      // check header     if (fasta[0] == '>') {         // remove 1 line, starting @ first position         lines.splice(0, 1);     }      // join array single string without newlines ,      // trailing or leading spaces     fasta = lines.join('').trim();      if (!fasta) { // empty whatever collected ? re-check not efficient          return false;     }      // note empty string caught above     // allow selenocysteine (u)     return /^[acdefghiklmnpqrstuvwy\s]+$/i.test(fasta); }

source: http://www.blopig.com/blog/2013/03/a-javascript-function-to-validate-fasta-sequences/

note, however, should perform same check on server side php. languages similar, , php provides need.


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