Error in HTML5 Programming with JavaScript for Dummies

A reader recently wrote to tell me of an error on Page 118 of HTML5 Programming with JavaScript for Dummies. The problem appears in the source code for the SearchString.HTML example. As written, the code will currently work in most cases, except if you type This as the input value. The problem is this bit of code:

if (Result == 0)
{
   document.getElementById("Result").innerHTML =
   "You must provide an input value!";
}

The value of Result can equal 0 in a number of situations, but the problem is that one of those situations, typing This as the search term, is actually a correct input. In order to fix this problem, you must change the comparison condition to look at the text input, rather than the result of the search. The following code works as anticipated.

if (FindValue == "")
{
   document.getElementById("Result").innerHTML =
   "You must provide an input value!";
}

As always, I want to hear about any problems you experience using my books. Please contact me at John@JohnMuellerBooks.com if you encounter any other problems with this example or have questions about the change in comparisons.

 

Author: John

John Mueller is a freelance author and technical editor. He has writing in his blood, having produced 99 books and over 600 articles to date. The topics range from networking to artificial intelligence and from database management to heads-down programming. Some of his current books include a Web security book, discussions of how to manage big data using data science, a Windows command -line reference, and a book that shows how to build your own custom PC. His technical editing skills have helped over more than 67 authors refine the content of their manuscripts. John has provided technical editing services to both Data Based Advisor and Coast Compute magazines. He has also contributed articles to magazines such as Software Quality Connection, DevSource, InformIT, SQL Server Professional, Visual C++ Developer, Hard Core Visual Basic, asp.netPRO, Software Test and Performance, and Visual Basic Developer. Be sure to read John’s blog at http://blog.johnmuellerbooks.com/. When John isn’t working at the computer, you can find him outside in the garden, cutting wood, or generally enjoying nature. John also likes making wine and knitting. When not occupied with anything else, he makes glycerin soap and candles, which comes in handy for gift baskets. You can reach John on the Internet at John@JohnMuellerBooks.com. John is also setting up a website at http://www.johnmuellerbooks.com/. Feel free to take a look and make suggestions on how he can improve it.