![]() When a tab renders in IE mode, the IE mode indicator icon appears in the address bar for the specific tab. The rendering process is constrained to the lifetime of the tab for a specific site (or app). The Microsoft Edge process manager handles the lifetime of the rendering process. In IE mode, the rendering process is based on Internet Explorer 11. Support for the following technologies is included in IE mode: IE mode allows enterprises to manage compatibility with technologies that are currently not compatible with any modern web browsers. ![]() When you navigate to these websites in Microsoft Edge, an instance of Internet Explorer 11 runs and renders the site in a tab. IE mode allows enterprises to specify a list of websites that only work in Internet Explorer 11. You could probably do even crazier things with breakpoint conditions, but I’ve only gone so far as console.log and alert.Internet Explorer mode (IE mode) integrates with Microsoft Edge DevTools. If you didn’t want log statements, you could replace them with alert(‘message’). Since console.log is falsey, it continues on instead of stopping the debugger. So, every time the debugger evaluates our condition by executing console.log and we see the message in the console. In our case console.log returns undefined which evaluates falsey. So, you can really put any JavaScript statement in as the condition and it will be evaluated as truthy or falsey. This is because of the JavaScript concept of truthy and falsey. With the JavaScript debugger, the meaning of conditional expression isn’t so hard and fast as it would be in other languages and debugger. ![]() The big difference here that you are using the JavaScript debugger. When the conditional expression is false, the debugger still executes the expression but will not stop at the breakpoint. When the conditional expression is true, the debugger stops at the breakpoint. Well, we are using conditional breakpoints, which is a feature found in quite a few debuggers, such as Visual Studio, Eclipse and Python. The $scope comes from the Angular framework which this sample used. Firefoxįirefox – Right-click menu for a breakpoint, select “Add Conditional Breakpoint” Firefox – Enter expression, using console.log as the conditional expression. The $scope comes from the Angular framework which this sample used. Chrome Chrome – Right-click menu for a breakpoint, select “Edit breakpoint…” Chrome – Enter expression, using console.log as the conditional expression. IE8 IE8 – Right-click menu for a breakpoint, select “Condition…” IE8 – Enter condition, using console.log as the condition. If you scroll down further, I’ll quickly explain why it works. I have some screenshots showing the right-click menu and the dialog that comes up for a variety of browsers. Or you could do something like console.log(‘complicated obj is ‘ + JSON.stringify(obj)) If you want detail about a variable just include that in your expression, something like console.log(‘name is ‘ + name + ‘ age is ‘ + age). In the dialog that comes up set the expression as console.log(‘message’).Right-click on the breakpoint to set the condition of the breakpoint.Add a breakpoint where you’d like your console.log statement to be.What if you could dynamically add/remove console.log statements in browsers all the way to IE8?.What if you could add console.log statements to any code in a web application, even code like JQuery or Angular or some other third-party code?.What if when you added those console.log statements you didn’t have to worry about committing them to source control?. ![]() What if you could dynamically add/remove console.log statements to an application running in a web browser?.Well what if you could avoid those limitations? And don’t forget to remove that log statement before you commit your source code. You have to go back to the editor, add the log statement, refresh the page, and then go back to where you were. And editing the source code of your application is an even bigger break in your debugging workflow. To add a console.log statement, you have to edit the source code of your application. So, now that I’ve refreshed your memory on the upside of console.log over a breakpoint, let’s talk about the downside compared to breakpoints. Contrast that with using a JavaScript breakpoint where you are forced to break your workflow to check the application state and then resume the execution of your application. Using console.log can be useful for printing out application state without interrupting your workflow. Are you writing a lot of JavaScript as part of your web application? Spending a lot of time debugging that JavaScript? I want to discuss a debugging technique today using that old standby, console.log and overcoming one of its deficiencies.
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