#visualstudiocodeشرح#visualstudiocode#vscodeصفحة الفيس بوكhttps://www.facebook.com/courses4arab. Vis.js community edition. A dynamic, browser based visualization library. The library is designed to be easy to use, to handle large amounts of dynamic data,.
Console.log debugging is a thing of the past. Launch or attach to your Node.js processes. Documentation site for ArcGIS API for JavaScript on ArcGIS for Developers.
-->You can use commands to send messages and perform other tasks in the JavaScript Console window of Visual Studio. For examples that show how to use this window, see QuickStart: Debug JavaScript. The information in this topic applies to Node.js app, UWP apps, and apps created using Visual Studio Tools for Apache Cordova.
If the JavaScript Console window is closed, you can open it while you're debugging in Visual Studio by choosing Debug > Windows > JavaScript Console.
Note
Visual Javascript Builder
If the window is not available during a debugging session, make sure that the debugger type is set to Script in the Debug properties for the project.
For info on using the console in Microsoft Edge Developer tools, see this topic.
console object commands
This table shows the syntax for the console object commands that you can use in the JavaScript Console window, or that you can use to send messages to the console from your code. This object provides a number of forms so that you can distinguish between informational messages and error messages, if you want to.
You can use the longer command form window.console.[command] if you need to avoid possible confusion with local objects named console.
Tip
Older versions of Visual Studio do not support the complete set of commands. Use IntelliSense on the console object to get quick information about supported commands.
| Command | Description | Example |
|---|---|---|
assert(expression, message) | Sends a message if expression evaluates to false. | console.assert((x 1), 'assert message: x != 1'); |
clear() | Clears messages from the console window, including script-error messages, and also clears script that appears in the console window. Does not clear script that you entered into the console input prompt. | console.clear(); |
count(title) | Sends the number of times that the count command was called to the console window. Each call to count is uniquely identified by the optional title.The existing entry in the console window is identified by the title parameter (if present) and updated by the count command. A new entry is not created. | console.count();console.count('inner loop'); |
debug(message) | Sends message to the console window.This command is identical to console.log. Objects that are passed by using the command are converted to a string value. | console.debug('logging message'); |
dir(object) | Sends the specified object to the console window and displays it in an object visualizer. You can use the visualizer to inspect properties in the console window. | console.dir(obj); |
dirxml(object) | Sends the specified XML node object to the console window and displays it as an XML node tree. | console.dirxaml(xmlNode); |
error(message) | Sends message to the console window. The message text is red and prefaced by an error symbol.Objects that are passed by using the command are converted to a string value. | console.error('error message'); |
group(title) | Starts a grouping for messages that are sent to the console window, and sends the optional title as a group label. Groups can be nested and appear in a tree view in the console window.The group* commands can make it easier to view console window output in some scenarios, such as when a component model is in use. | console.group('Level 2 Header');console.log('Level 2');console.group();console.log('Level 3');console.warn('More of level 3');console.groupEnd();console.log('Back to level 2');console.groupEnd();console.debug('Back to the outer level'); |
groupCollapsed(title) | Starts a grouping for messages that are sent to the console window, and sends the optional title as a group label. Groups that are sent by using groupCollapsed appear in a collapsed view by default. Groups can be nested and appear in a tree view in the console window. | Usage is the same as the group command.See the example for the group command. |
groupEnd() | Ends the current group. Requirements: Visual Studio 2013 | See the example for the group command. |
info(message) | Sends message to the console window. The message is prefaced by an information symbol. | console.info('info message');For more examples, see Formatting console.log output later in this topic. |
log(message) | Sends message to the console window.If you pass an object, this command sends that object to the console window and displays it in an object visualizer. You can use the visualizer to inspect properties in the console window. | console.log('logging message'); |
msIsIndependentlyComposed(element) | Used in web apps. Not supported in UWP apps using JavaScript. | Not supported. |
profile(reportName) | Used in web apps. Not supported in UWP apps using JavaScript. | Not supported. |
profileEnd() | Used in web apps. Not supported in UWP apps using JavaScript. | Not supported. |
select(element) | Selects the specified HTML element in the DOM Explorer. | console.select(element); |
time (name) | Starts a timer that's identified by the optional name parameter. When used with console.timeEnd, calculates the time that elapses between time and timeEnd, and sends the result (measured in ms) to the console using the name string as a prefix. Used to enable instrumentation of app code for measuring performance. | console.time('app start'); app.start(); console.timeEnd('app start'); |
timeEnd(name) | Stops a timer that's identified by the optional name parameter. See the time console command. | console.time('app start'); app.start(); console.timeEnd('app start'); |
trace() | Sends a stack trace to the console window. The trace includes the complete call stack, and includes info such as filename, line number, and column number. | console.trace(); |
warn(message) | Sends message to the console window, prefaced by a warning symbol.Objects that are passed by using the command are converted to a string value. | console.warn('warning message'); |
Miscellaneous commands
These commands are also available in the JavaScript Console window (they are not available from code).
| Command | Description | Example |
|---|---|---|
$0, $1, $2, $3, $4 | Returns the specified element to the console window. $0 returns the element currently selected in DOM Explorer, $1 returns the element previously selected in DOM Explorer, and so on, up to the fourth previously selected element. | $3 |
$(id) | Returns an element by ID. This is a shortcut command for document.getElementById(id), where id is a string that represents the element ID. | $('contenthost') |
$$(selector) | Returns an array of elements that match the specified selector using CSS selector syntax. This is a shortcut command for document.querySelectorAll(). | $$('.itemlist') |
cd()cd(window) | Enables you to change the context for expression evaluation from the default top-level window of the page to the window of the specified frame. Calling cd() without parameters returns the context to the top-level window. | cd();cd(myframe); |
select(element) | Selects the specified element in DOM Explorer. | select(document.getElementById('element'));select($('element'));select($1); |
dir(object) | Returns a visualizer for the specified object. You can use the visualizer to inspect properties in the console window. | dir(obj); |
Checking whether a console command exists
You can check whether a specific command exists before attempting to use it. This example checks for the existence of the console.log command. If console.log exists, the code calls it.
Examining objects in the JavaScript Console window
You can interact with any object that's in scope when you use the JavaScript Console window. To inspect an out-of-scope object in the console window, use console.log , console.dir, or other commands from your code. Alternatively, you can interact with the object from the console window while it is in scope by setting a breakpoint in your code (Breakpoint > Insert Breakpoint).
Formatting console.log output
If you pass multiple arguments to console.log, the console will treat the arguments as an array and concatenate the output.
console.log also supports 'printf' substitution patterns to format output. If you use substitution patterns in the first argument, additional arguments will be used to replace the specified patterns in the order they are used.
The following substitution patterns are supported:
%s - string%i - integer%d - integer%f - float%o - object%b - binary%x - hexadecimal%e - exponent
Here are some examples of using substitution patterns in
console.log:
See also
Summary
Visual Javascript
Many Internet Web sites contain JavaScript, a scripting programming language that runs on the web browser to make specific features on the web page functional. If JavaScript has been disabled within your browser, the content or the functionality of the web page can be limited or unavailable. This article describes the steps for enabling JavaScript in web browsers.
More Information
Internet Explorer
To allow all websites within the Internet zone to run scripts within Internet Explorer:
On the web browser menu, click Tools or the 'Tools' icon (which looks like a gear), and select Internet Options.
When the 'Internet Options' window opens, select the Security tab.
On the 'Security' tab, make sure the Internet zone is selected, and then click on the 'Custom level...' button.
In the Security Settings – Internet Zone dialog box, click Enable for Active Scripting in the Scripting section.
When the 'Warning!' window opens and asks, 'Are you sure you want to change the settings for this zone?' select Yes.
Click OK at the bottom of the Internet Options window to close the dialog.
Click the Refresh button to refresh the page and run scripts.
To allow scripting on a specific website, while leaving scripting disabled in the Internet zone, add the specific Web site to the Trusted sites zone:
Visual Javascript Editor
On the web browser menu, click Tools, or the 'Tools' icon (which looks like a gear) and select Internet Options.
When the 'Internet Options' window opens, select the Security tab.
On the 'Security' tab, select the Trusted sites zone and then click the Sites button.
For the website(s) you would like to allow scripting, enter the address within the Add this website to the zone text box and click Add. Note: If the address does not begin with 'https:', you many need to uncheck 'Require server verification (https:) for all sites in this zone'.
Click Close and then click OK at the bottom of the Internet Options window to close the dialog.
Click the Refresh button to refresh the page and run scripts.
Google Chrome
To enable JavaScript in Google Chrome, please review and follow the instructions provided at Enable JavaScript in your browser to see ads on your site.
Mozilla Corporation’s Firefox
Visual Javascript Ide
To enable JavaScript in Firefox, please review and follow the instructions provided at JavaScript settings for interactive web pages.