Stylesheets in Google Apps Script UiApp

Despite the documentation, it is quite well possible to use style sheets in a Google Apps Script UiApp.

The documentation of Google Apps Script is quite clear: “… there is no way to use custom style sheets in UiApp.”. This is mentioned in relation to the stylename methods, such as setStyleName(). However, most elements in the UiApp have the  setStyleAttributes() method. This accepts an object with style attributes, e.g.

label.setStyleAttributes({background: "black", color: "green"});

This is how you can assign style information to an element.

The essence of a style sheet is to separate the formatting from the content and the program logic. Separate style sheets make the script more readable and enable you to change the appearance and layout of all pages in a UiApp, just by editing one single file.

In Google Apps Script, you can realize this by setting the style attributes using named objects, and define these objects in a separate file. The following example shows how this works.

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ObjDB: the easy way to store data with Google Apps Script

There are various ways in Google Apps Script to store data, a common way is to store data in a spreadsheet. Spreadsheet data is relatively easy to access, and sample code is provided to read data from a spreadsheet into an array of JavaScript objects, and to write from objects to the spreadsheet. For more advanced database functions (update, select, delete), you have to do some more programming.

For larger applications, you may want to use MySQL or other databases via JDBC, Again, some sample code is provided, but this time not to read/write to and from JavaScript objects. A lot more coding is required, especially to link the fields in each record to the field name, instead of just the offset in the results rows.

To make it easier to work with data in Google Apps Script, both from spreadsheets and from JDBC databases, I have developed the ObjDB library. This is a set of functions, with which you can open a spreadsheet or database, and do all the basic operations: select, update, insert, delete. Functions are the same for spreadsheets and for JDBC databases, except the different parameters for the open() function, so if you start with data in a spreadsheet, and later move the data to a database, there is hardly any code to change.

To show how the library works, I prepared a demo spreadsheet with script. Open the link, it should create a new copy of the spreadsheet, if not, copy it yourself. Then go to ToolsScript editor…, and run any of the functions to see it in action.

Note that the script in this spreadsheet includes the objDB library, see under ResourcesManage Libraries….

For more documentation, reference and source code, go to

How to index Project Gutenberg files

project_gutenberg_logoProject Gutenberg offers over 40,000 free ebooks: choose among free EPUB books, free kindle books, download them or read them online. Recently, they have added support for Dropbox, so you can download ebooks directly to your Dropbox account. It will create a folder ‘Apps/gutenberg’, and will store all ebooks in that folder.

After a while, this Dropbox folder will have a long list of files, all with names like pg1234.epub and pg5678-images.epub. They have some meaning, but which file contains which title? Of course, you can rename each ebook  after downloading, but this is extra work, and I want a smart solution.


So I created a script to create an index for all ebooks–at least, for those in EPUB format. Now there is simply an index.html file, which will open in any browser. It shows the file name, together with the creator, title and language. Depending on how you view the index.html file, the links may be clickable, In any case, you can quickly see which file is which book.


The script works on any set of EPUB file, but usually, they will have a more meaningful name and there will be less need for a script like this.

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Send Gmail to Evernote: an overview of the tools

Updated 28 June 2013: both Evernote Web Clipper and Powerbot have new versions, the table refers to these new versions.

In the creation and development of the Google Apps script to send Gmail messages to Evernote, I have looked around what other tools are available. These are the other tools that I found:

  • forwarding to the Evernote email address and using the InQloud service;
  • the Evernote Web Clipper (only tested on Windows/Chrome);
  • PowerBot, an extension for Chrome (also others versions available, e.g., for Firefox and Safari)
  • IFTTT and Zapier, tools that enable you to connect between other web services

I have looked at how well these tools keep the formatting of the message, whether they keep attachments, have a link back to the message in Gmail, whether they can be automated using Gmail filters, and whether you can select the notebook or tags, and edit/comment on the message before sending.

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New version of Gmail to Evernote script creates link to Gmail in Evernote

Version 2 of the Gmail to Evernote script has been released. The new version adds text on top of the message in Evernote, with the basic headers from the email message (From, To, Date) and a link back to view the message in Gmail. For example, if you forwarded the message to a task list in Evernote, you can now quickly send a response after completing the task. No more searching in Gmail to find the message back!

There are more changes, and you have to do some extra configuration steps if you use multiple sign-in for Google, because in that case, the link to the Gmail message is not always correct.

This version will send email notifications when a new version is available. If you are running the script directly from, you don’t need to update, and you will not receive a notification, unless some other action is required or relevant information can be given.

If you made your own copy of the script, you will always receive a notification of new versions, so you can replace your copy with the new version.

You may have to authorize and grant access again, see the previous update on Gmail to Evernote.

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Sprintf: merge text and variables in Javascript

The function sprintf is common in many programming languages, as a way to merge programme variables in a text string. It has good options for formatting, such as outlining text string, or setting the precision of numbers. In many cases, you don’t need those, and a simple function that just inserts the variables at the right place is fine, and a better option in order to keep your JavaScript code short. See the example below:

// Simple string concatenation
var html1 = '<a href="' + url + '">' + link + '</a>';

// Using sprintf
var html2 = sprintf( '<a href="%s">%s</a>', url, link );

In this article, I share a simple function doing string replacements. For sprintf alternatives with the full functionality, just Google on ‘javascript sprintf’, and you will find some good versions. If you don’t need all that, read on.

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A new look

This site now uses the new version of WordPress, version 3.5. Many changes, but mainly  in the back-end, the admin site. Also new is the default theme, Twenty Twelve, which has a responsive layout, i.e. the layout will be adapted depending on the screen size, so it will work as well on a smartphone.

Before, I used the Roots theme, a.o. because it has a responsive layout. The previous default theme, Twenty Eleven, was not responsive, en therefore less suitable for mobile phones.

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Disable the Caps Lock key

I use a wireless keyboard/mouse combo, the Logitech MK260. What I like about it, is that, even though the keys are regular size, the keyboard itself is nice and small. What I found out only after buying, is that there are no LEDs to indicate that Caps Lock is on. Same for Num Lock, but I don’t accidentally press Num Lock that often. For Caps Lock it was an issue, until I realized, why need a Caps Lock anyway?

I usually don’t SHOUT, so I might as well do without the Caps Lock and have it function as an additional Shift key. That is exactly what the registry hack described in this article does: How to Disable Caps Lock Key in Windows 7 or Vista. And yes, it also works if you don’t bother to try and understand the technical details.

Send Google Mail to Evernote

Evernote is a great system to organize your notes, and to remember everything. You often want to add email message to Evernote, for example to add it to a To-do list. Evernote makes this possible by providing an email address, to which you can forward other messages–they will then be added to your other notes. But you still have to tag them, and you may want to put them in a different notebook. This can also be done by appending notebook and tags to the subject line, but this takes time and you can easily make a typing mistaken.

The method described here makes it much faster and easier: simply drag tags and notebook to the message, that’s it. It is shown in this video, and you can click through to read how to make it work for you. The video is short, less than 40 seconds, but it should not take more time to forward the message and see the result.

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