free barcode font for asp net 13: Debug JavaScript Programs in Java

Generation QR in Java 13: Debug JavaScript Programs

CHAPTER 13: Debug JavaScript Programs
Denso QR Bar Code Generator In Java
Using Barcode creation for Java Control to generate, create Denso QR Bar Code image in Java applications.
Scan QR Code 2d Barcode In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
Again, once we are satisfied this function is working properly, we should remove or comment out those alert boxes to save our visitors from a lot of unnecessary mouse clicks A similar debugging technique involves the careful and incremental use of comments Let s say you have a JavaScript function that does not appear to be working correctly You have looked over the source code, and cannot figure out the source of the problem
Bar Code Printer In Java
Using Barcode creator for Java Control to generate, create bar code image in Java applications.
Scanning Bar Code In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
// Converts a number from "9999999" to "9,999,999" function convert_number(input) { var counter, output; if (inputlength < 4) return input; output = ""; for (counter = inputlength-3; counter > 0; counter -= 3) { output = "," + inputsubstr(counter, counter+3) + output; } output = inputsubstr(0, counter+3) + output; return output; }
Paint Quick Response Code In Visual C#.NET
Using Barcode generator for Visual Studio .NET Control to generate, create Denso QR Bar Code image in Visual Studio .NET applications.
Quick Response Code Creator In VS .NET
Using Barcode generation for ASP.NET Control to generate, create QR Code JIS X 0510 image in ASP.NET applications.
1 Start by commenting out the contents of the entire function If the function is supposed to return a value, force it to return a hard-coded value that simulates what you are expecting Test the script to make sure it is now working correctly with the hard-coded value
Making QR Code In VS .NET
Using Barcode generator for Visual Studio .NET Control to generate, create QR Code ISO/IEC18004 image in .NET applications.
QR Code JIS X 0510 Creator In Visual Basic .NET
Using Barcode printer for .NET Control to generate, create QR image in Visual Studio .NET applications.
// Converts a number from "9999999" to "9,999,999" function convert_number(input) { // var counter, output; // // if (inputlength < 4) return input; // output = ""; // // for (counter = inputlength-3; counter > 0; counter -= 3) { // output = "," + inputsubstr(counter, counter+3) + output; // }
Make Barcode In Java
Using Barcode creation for Java Control to generate, create barcode image in Java applications.
Code 3/9 Encoder In Java
Using Barcode creation for Java Control to generate, create Code 3/9 image in Java applications.
How to Do Everything with JavaScript
ANSI/AIM Code 39 Generation In Java
Using Barcode encoder for Java Control to generate, create Code-39 image in Java applications.
UCC - 12 Printer In Java
Using Barcode maker for Java Control to generate, create EAN 128 image in Java applications.
// // output = inputsubstr(0, counter+3) + output; return output; // ** Hard-coded return value ** return "1,234,567"; }
Encode UPC E In Java
Using Barcode drawer for Java Control to generate, create Universal Product Code version E image in Java applications.
Encode Barcode In Visual Studio .NET
Using Barcode drawer for Reporting Service Control to generate, create barcode image in Reporting Service applications.
2 Next, uncomment a few of those lines For instance, make the function return its input string instead of the hard-coded value Again, test that this expected result (the input string) is working correctly
Bar Code Scanner In C#.NET
Using Barcode Control SDK for Visual Studio .NET Control to generate, create, read, scan barcode image in .NET applications.
EAN 128 Creator In None
Using Barcode encoder for Word Control to generate, create EAN 128 image in Microsoft Word applications.
// Converts a number from "9999999" to "9,999,999" function convert_number(input) { var counter, output; if (inputlength < 4) return input; output = ""; // // // // // for (counter = inputlength-3; counter > 0; counter -= 3) { output = "," + inputsubstr(counter, counter+3) + output; } output = inputsubstr(0, counter+3) + output; return output; // ** Return the input value ** return input; }
Generate Barcode In Java
Using Barcode encoder for Android Control to generate, create bar code image in Android applications.
Barcode Generator In Java
Using Barcode encoder for Eclipse BIRT Control to generate, create barcode image in Eclipse BIRT applications.
3 Carefully uncomment more lines from the script Know in advance what you expect the return value to be after each set of comments is removed, and then retest 4 Repeat step 3 as necessary At some point, you will discover that the return value is not the value you expected The most recently uncommented lines are the most likely source of the problem! Adding debugging code and using comments are two of the most useful techniques for manually figuring out the source of errors inside scripts
Encoding GS1 - 13 In None
Using Barcode creation for Online Control to generate, create EAN 13 image in Online applications.
Painting Code-128 In Objective-C
Using Barcode generation for iPad Control to generate, create Code128 image in iPad applications.
Use the JavaScript Console
The Netscape and Mozilla browsers include a useful utility called the JavaScript console The JavaScript console opens in its own window, and this is the place where Netscape outputs any JavaScript errors it encounters The console will continue to accumulate error messages from web pages until the browser is closed or the console is cleared manually
CHAPTER 13: Debug JavaScript Programs
FIGURE 13-1
The Netscape console shows JavaScript errors
To access the console in Netscape 7, go to Tools | Web Development, and choose JavaScript Console (In Netscape 6, the JavaScript Console option is located in Tasks | Tools) The console is empty when the browser is first opened, but will accumulate error messages as they occur for many different pages and sites as you surf The console also allows developers to input JavaScript code for the browser to execute Simply type the variable name into the console, click Evaluate, and the console will tell you the last value for that variable Or you can have JavaScript manually call a function by typing in the function name along with any parameters Figure 13-1 shows what the console looks like in the Netscape 7 web browser
Copyright © OnBarcode.com . All rights reserved.