function Mid(str, start, len) /*** IN: str - the string we are LEFTing start - our string's starting position (0 based!!) len - how many characters from start we want to get RETVAL: The substring from start to start+len ***/ { // Make sure start and len are within proper bounds if (start < 0 || len < 0) return ""; var iEnd, iLen = String(str).length; if (start + len > iLen) iEnd = iLen; else iEnd = start + len; return String(str).substring(start,iEnd); } // Keep in mind that strings in JavaScript are zero-based, so if you ask // for Mid("Hello",1,1), you will get "e", not "H". To get "H", you would // simply type in Mid("Hello",0,1) // You can alter the above function so that the string is one-based. Just // check to make sure start is not <= 0, alter the iEnd = start + len to // iEnd = (start - 1) + len, and in your final return statement, just // return ...substring(start-1,iEnd)
file: /Techref/language/asp/js/Mid.htm, 1KB, , updated: 2008/2/2 02:52, local time: 2024/11/8 22:26,
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