Simple JavaScript addition

Hello Everyone,

I'm trying to write a simple javascript function that is based on addition.

I'm having a chain of products with unique id's with follwoing formats: CA-XXXX

Here XXXX is a 4 digit number... starting from 0001, 0002, 0003 and so onwards...

I have a page where the user can enter 5 products to the database. The unique ID's are generated by my JavaScript function.

The previous unique id from the Database is fetched by JavaScript and then i start doing the addition. Here is my function:

function nextProducts()
    {
//get the last available product already in the database, fetched from unique id last_product somewhere as hidden id on the page
    var str1 = document.getElementById("last_product").value;
    var productId = "product_number";
    var length = str1.length;
    prefix = str1.substring(0,2);
    if (prefix == "CA" || prefix == "LU")
        {
//here i'm extracting the last 4 digits from ID such as CA-XXXX, BV-XXXX, or LU-XXXX
        suffix = str1.substring(length-4,length);
        prefix = str1.substring(0,2);
        }
    else if (prefix == "BV")
        {
        suffix = str1.substring(length-4,length);
        prefix = str1.substring(0,3);
        }
    else 
        {
        suffix = str1.substring(0,length);
        prefix = "";
        }
    
    for (i = 1; i<=5 ; i++ )    
        {
//here's the problem...
//when i use parseInt function 0001 is converted into only 1 and next product id is shown as 2 to me..
//if i dont use the parseInt function, then suffix is treated as a string and i get 00011 as the result...
        suffix = parseInt(suffix) + 1;
        
        newProd = prefix+suffix;
        var product2 = productId + i;
        document.getElementById(product2).value = newProd;
        }
        
    }    

PHP:

 

You will need to add leading zeros manually

function padZeros(num, totalLen) {
   var numStr = num.toString();
   var numZeros = totalLen - numStr.length;
   if (numZeros > 0) {
      for (var i = 1; i <= numZeros; i++) {
         numStr = "0" + numStr;
      }
   }
   return numStr;
}

Code (markup):

The use:

suffix = padZeros(parseInt(suffix) + 1, 4);

Code (markup):

 

Thanks a ton lazy coder!! Worked like a charm!

 

I'm glad to help.

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