Truncate a string if it is longer than the specified number of characters

textTtruncate.js

function truncateString(str, len, append)
{
   var newLength;
   append = append || "";  //Optional: append a string to str after truncating. Defaults to an empty string if no value is given

   if (append.length > 0)
    {
      append = " "+append;  //Add a space to the beginning of the appended text
    }
   if (str.indexOf(' ')+append.length > len)
   {
       return str;   //if the first word + the appended text is too long, the function returns the original String
   }

   str.length+append.length > len ? newLength = len-append.length : newLength = str.length; // if the length of original string and the appended string is greater than the max length, we need to truncate, otherwise, use the original string

        var tempString = str.substring(0, newLength);  //cut the string at the new length
        tempString = tempString.replace(/\s+\S*$/, ""); //find the last space that appears before the substringed text


   if (append.length > 0)
      {
           tempString = tempString + append;
      }

   return tempString;
};

console.log(truncateString("Make sure an element and number of items to truncate is provided", 15,"..."));

//Got it on https://www.nfollmer.com/2016/07/06/truncate-string-word-break-javascript/