Once you click on that it will open all the errors in the console with possible reasons for that error. When there are Javascript errors in the page it is shown in the Firefox status bar. To add conditional break points just right click near the line number you want to put the break point and type your condition. One special thing with Firebug is that you can put conditional break points. You can put breakpoints just by clicking the near the line number. Once you open the Firebug you can inspect the javascripts under the Script tab and do the debugging. ![]() Using that you can enable and disable firebug for selected sites. Once you install Firebug you will get a menu item in under the Tools menu. See my previous artical on how to debug in Internet Explorer.įirebug is not only a javascript debugger, it is a complete web debugging tool where you can explore the html DOM and much much more. This one will explain how to debug on Firefox using Firebug. And, from the point of view of Mozilla, it is almost as if the server didn't exist.This is the part of the my How to debug Javascripts artical. For example, where are the debug facilities for many of the HTML5 API or Open Web App APIs? If you are debugging webworkers, application cache or even geolocation apps then you don't get much in the way of help. So while Mozilla seems to be taking the requirements of developers seriously, there is still a lot to be done. Perhaps the solution is the "fledgling" developer tools API which might allow third parties to build more logical and complete development environments which rely on Firefox for the debug runtime. You can see the what is being repainted in the following video:Īll nice, but again the main problem is that these are ad-hoc tools. There is also the promise of being able to see how repainting a page progresses and the ability to control the CSS animation clock so that you can see what is happening. There is still much duplication, however, and the new built-in Network panel is another example.įuture versions of the Firefox debugger will support source maps to make it easier to work with CoffeeScript, and perhaps other languages that compile to JavaScript. There is a sort of promise to try harder not to put built-in development tools in the way of using Firebug. What is worse is that much of the work is duplicating features already found in Firebug. To do the job properly Mozilla would have to commit to building a Firefox IDE, and as it hasn't, mostly its attempts are piecemeal solutions to problems as they turn up. Mozilla is trying to solve a problem that is outside of its area. However, the problem is really that Firefox is just a browser and what we are looking for is a complete IDE. Both approaches were demoed and explored at the meeting. The alternative is to allow the programmer to write the code directly into the browser. The first way is to allow the programmer to write code using an external editor that links directly into Firefox so that you can see the result. The two key ideas are about coupling the browser to code production. But most importantly Paul Rouget revealed some of the forward thinking in his blog. Recently Mozilla held a Developer Tools work week where lots of new ideas were demoed. With addons such as Firebug providing JavaScript debugging without code editing, web development is more complicated than it needs be. Even this doesn't really give you an idea of how poor the integration is. Now compare this to the usual Editor,Browser,Tools workflow. ![]() In Netbeans you can run and debug a program using a built-in server and web browser that makes debugging much easier. The latest version of Netbeans gives you some idea of what it could be like if only things could be standardized enough to be integrated. We have the web server, a range of possible browsers, multiple server-side languages subsystems and a range of generally poor IDEs that fail to integrate things. Part of the reason is the way that the entire system is strung out over many components. The tools that we use are very poor compared the best you can find for desktop development. It is all too painfully obvious that the web wasn't designed as a development environment. Who says that the browser should be the host for debugging activities anyway? Mozilla has been considering what we need in the way of debugging and general developer tools in Firefox.
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