Adobe JavaScript Cookbook

Recent Recipes Latest recipes on JavaScript

• Convert 3-digit hexadecimal color values to 6 digits
  • David Powers 
  •   January 8, 2010
  • Not yet rated.
  
  

  Problem

  Dreamweaver CS4 automatically uses 3-digit hexadecimal shorthand for colors (e.g. #FFF instead of #FFFFFF for white). You need to use the 6-digit values instead.

  Solution

  Use a regular expression to find the 3-digit values and replace them with the equivalent 6-digit value. You can store a query in Dreamweaver to replace all shorthand hexadecimal values in a single find and replace operation. The regular expression can be used in JavaScript, PHP, or any other situation where regular expressions are supported.

• How can I prevent my images from being copied?
  • David Powers 
  •   January 6, 2010
  • Not yet rated.
  
  

  Problem

  You are a photographer, or your client is. You've got some wonderful photos that you want to show in a website, but you don't want anyone to steal them. How can you prevent them from being copied?

  Solution

  You can't. It's impossible. A number of so-called solutions abound on the web, but none of them works. Even if you use a technique that avoids the image being loaded into the browser cache, screen grabbing software can easily make a copy of any image. However, there are a number of techniques that help protect images.

• Alternate colors for table rows
  • David Powers 
  •   January 4, 2010
  • Avg. rating 4.00
  
  

  Problem

  I want alternate table rows to have a different background color. I know I can do it by adding a CSS class to every other row, but this means I need to change the code every time an new row is added to the table.

  Solution

  Use JavaScript or a dynamically-generated table to add a different background color to every other row. This recipe shows you how to do it with Spry, jQuery, or PHP. Alternate colors for table rows not only look more attractive, they increase the readability of tables filled with data.

• How often events fire and their sequence
  • Niall O'Donovan 
  •   November 25, 2009
  • Not yet rated.
  
  

  Problem

  Some events fire more often than others. Depending on what the designer is trying to achieve, this can be inefficient and may not have the desired effect at runtime. Another issue is the sequence in which events fire. A designer may have a requirement for several scripts to fire in a certain sequence. Having an understanding of how LC Designer and Acrobat fire events can help at design time.

  Solution

  I original had the idea of having a form that set out the pros and cons of each event and giving examples of script that could be used in each event. In the end, it has focused on the number of times that different events fire and the sequence. To view this form you will need Acrobat/Reader version 9 or above. This is because it contains script against the preOpen and postOpen events. Also it used setItems to populate the listbox.

• Script to access Acrobat menu items
  • Niall O'Donovan 
  •   November 25, 2009
  • Not yet rated.
  
  

  Problem

  There are a wide range of scripts that can be used to access menu items in Acrobat. However some of these are blocked for security reasons. There are a range of menu items that are still accessible; however the syntax is not always clear.

  Solution

  This PDF (XFA form) provides the script for the Acrobat menu items that are currently permitted. It also has XFA equivalents and Acrobat JavaScript equivalents, where these are available. The form is set up so that you can access the scripts by clicking the buttons. The scripts appear in a dialogue and can be copied directly into LiveCycle Designer.