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                                  • Sometimes the JavaScript code does not work properly, and you do not know what exactly happens with your code.
                                    What should I do to display JavaScript exceptions in my browser?

                                • Joseph Tang 3 08.27.2013

                                  The data service is ruuning on intranet. I turned on the FireBug and found out that there is a Proxy Authentication error. However, I didn't get it on Internet Explorer.

                                • Joseph Tang 3 08.27.2013

                                  When I run the WCF web service on FireFox, it works fine. However, when I use the DevExpress simulator with FireFox, I got Proxy Authentication Error. I think that there is a problem on the simulator.

                                • Hi Joseph,

                                  I have created a separate ticket regarding this issue Proxy Authentication error. Please post all messages to these ticket.

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                                1 Solution

                                2

                                Internet Explorer


                                Check whether the Developer Toolbar is installed on your machine. If you are using IE8+, this tool is already integrated in your browser. Otherwise, you need to install it manually. If the Developer Tool is installed, perform the following steps:

                                1. Enable script debugging options via the Control Panel -> Internet Options -> Advanced Tab -> Browsing section. Disable both Disable script debugging options and press the OK button.



                                2. Perform the steps to reproduce the issue again;
                                3. The Webpage Error window should be displayed;

                                4. Go through the Webpage Error window by clicking the Yes button;
                                5. The Developer Tools window will be displayed;

                                6. Click the Call stack tab and analyze your code;

                                7. Make a screenshot like the one shown below and send it to us.

                                Firefox

                                The Firebug add-on is used for this purpose. Check whether this tool is installed on your machine and perform the following steps:

                                1. Execute Firebug by pressing the F12 key on your keyboard. Alternatively, click the Tools -> Web Developer -> Firebug -> Open Firebug menu as shown below.

                                2. The Firebug window will be displayed;

                                3. Switch to the console window by clicking the Console tab;

                                4. Perform the steps to reproduce the issue again;

                                5. The JavaScript exception will be displayed in the console;

                                6. Click the exception to see the code where error occurred;


                                7. Click the Stack tab and analyze your code. Make a screenshot like the one shown below and send it to us.

                                Chrome



                                Use Developer Tools to accomplish this task.
                                1. Execute Developer Tools by pressing the F12 key on your keyboard. Alternatively, click the Menu -> Tools -> Developer tools menu as shown below.


                                2. The Developer Tools window will be displayed;

                                3. Switch to the console window by clicking the Console tab;

                                4. Perform the steps to reproduce the issue again;
                                5. The JavaScript exception will be displayed in the console;

                                6. Click the exception to see the callstack;

                                7. Make a screenshot of the callstack to send it to us;

                                8. Click a link that is highlighted below to see in which part of the script error occurred;

                                9. Analyze your code. Make a screenshot like the one shown below and send it to us.

                                Opera

                                Use the Opera Dragonfly tool.
                                1. Execute the Opera Dragonfly tool by pressing the Ctrl+Shift+I key combination on your keyboard. Alternatively, click the Menu -> Page -> Developer Tools -> Opera Dragonfly menu as shown below.

                                2. The Opera Dragonfly tool window will be displayed;

                                3. Switch to the script window by clicking the Scripts tab, then click the Show parse errors and break on exceptions button;

                                4. Perform the steps to reproduce the issue again to see in which part of code the error occurs;

                                5. Make a screenshot like the one shown above and send it to us.

                                Safari


                                1. Click the Safari settings -> Preferences... menu as shown below.

                                2. In the Settings window click the Advanced tab and enable the Show Develop menu in menu bar option as shown below.


                                3. Close the Settings window and click the Menu for current page -> Develop -> Show Web Inspector menu.


                                The remaining steps are the same as for Google Chrome.

                                See also:
                                How to use F12 Developer Tool to Debug your Webpages
                                Scripting Debugging in Internet Explorer

                                Enabling firebug
                                Chrome Developer tools
                                Opera Dragonfly


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