In Eclipse, when hovering over a method, variable, etc. a tooltip is displayed with the corresponding JavaDocs. Is there such a feature in IntelliJ?
For IntelliJ 13, there is a checkbox in Editor's page in IDE Settings
EDIT: For IntelliJ 14, the option has been moved to Editor > General page. It's the last option in the "Other" group. (For Mac the option is under the menu "IntelliJ Idea" > "Preferences").
EDIT: For IntelliJ 16, it's the second-to-last option in Editor > General > Other.
EDIT: For IntelliJ Ultimate 2016.1, it's been moved to Editor > General > Code Completion.
EDIT: For IntelliJ Ultimate 2017.2, aka IntelliJ IDEA 2017.2.3, there are actually two options:
In Editor > General > Other (section) > Show quick documentation on mouse move - delay 500 ms
Select this check box to show quick documentation for the symbol at caret. The quick documentation pop-up window appears after the specified delay.
In Editor > General > Code Completion (sub-item) > Autopopup documention in 1000 ms, for explicitly invoked completion
Select this check box to have IntelliJ IDEA automatically show a pop-up window with the documentation for the class, method, or field currently highlighted in the lookup list. If this check box is not selected, use Ctrl+Q to show quick documentation for the element at caret.
Quick documentation window will automatically pop up with the specified delay in those cases only, when code completion has been invoked explicitly. For the automatic code completion list, documentation window will only show up on pressing Ctrl+Q.
EDIT: For IntelliJ Ultimate 2020.3, the first option is now located under Editor > Code Editing > Quick Documentation > Show quick documentation on mouse move
Up until IntelliJ version 11, no, not just by hovering over it. If the cursor is inside the method- or attribute name, then CTRL+Q will show the JavaDoc on *nix and Windows. On MacOSX, this is CTRL+J.
Quote: "No, the only way to see the full javadoc is to use Quick Doc (Ctrl-Q)." -- http://devnet.jetbrains.net/thread/121174
EDIT
Since IntelliJ 12.1, this is possible. See #ADNow's answer.
It is possible in 12.1.
Find idea.properties in the BIN folder inside of wherever your IDE is installed, e.g. C:\Program Files (x86)\JetBrains\IntelliJ\bin
Add a new line to the end of that file:
auto.show.quick.doc=true
Start IDEA and just hover your mouse over something:
After doing CTRL+Q, you can
Pin the tooltip (top right corner)
Check Docked Mode (under gear in top right after pinning)
Size as desired
Click icon for Auto show documentation for selected item
Then when you move your cursor, the documentation will appear in this box. It costs you a little screen real estate, but I find it's worth it.
I'd post a screenshot but SO won't let me post images.
For Intellij 15, use the checkbox in File > Settings > Editor > General option Show quick documentation on mouse move.
You can also get there by typing "quick" or something similar in the search box:
In Intellij13, you can use Editor configuration like below:
IntelliJ IDEA 14.0.3 Ultimate: Press Ctrl+Alt+S, then choose Editor\General choose Show quick domentation on mouse move
Tips: Look at the top right conner (gear icon) at JavaDoc pop-up window, You can choose:
- Show Toolbar
- Pinded Mode
- Docked Mode
- Floatting Mode
- Split Mode
Adding on to what ADNow said. On the Macintosh:
Right click on IntelliJ IDEA 12
Click on the Show Package Contents menu option
Open the bin folder
Open idea.properties
Add the line:
auto.show.quick.doc=true
The easiest way, at least for me, was:
Ctrl+Shift+A
Type: show document
Show quick documentation on mouse move (set it to ON)
From IntelliJ Ultimate 2018.1.5, aka IntelliJ IDEA 2018.1.5, till 2019.3 , there are actually two options under File -> Preferences:
In Editor > General > Other (section) > Show quick documentation on mouse move - delay 500 ms
Select this check box to show quick documentation for the symbol at caret. The quick documentation pop-up window appears after the specified delay.
In Editor > General > Code Completion (sub-item) > Auto-display documentation in 1000 ms
Select this check box to have IntelliJ IDEA automatically show a pop-up window with the documentation for the class, method, or field currently highlighted in the lookup list. If this check box is not selected, use Ctrl+Q to show quick documentation for the element at caret.
Quick documentation window will automatically pop up with the specified delay in those cases only, when code completion has been invoked explicitly. For the automatic code completion list, documentation window will only show up on pressing Ctrl+Q.
In IntelliJ IDEA 14, it has moved to: File -> Settings -> Editor -> General -> "Show quick doc on mouse move"
In Intellij 2019, I did: File > Settings > Editor > General option Show quick documentation on mouse move.
File-->Settings-->Editor
Check "Show quick doc on mouse"
Now when you put the mouse over a method a tooltip with the documentation will appear. Sometimes the tooltip size is too small and you will have to resize it moving the mouse down to the bottom of the tooltip.
IDEA has "find action":
Open "Help" menu, type "doc", move cursor to "Quick Documentation" it will be highlighted.
Also "find action" can be called from hot key (you can find it in settings->hotkeys)
On mac in IntelliJ Ultimate (trial) 14 I have mine under Settings > Editor > General > Code completion. The tooltip short is F1 on my laptop.
It's called "Autopopup documentation in (ms):"
A note for Android Studio (2.3.3 at least) users, because this page came up for my google search "android studio hover javadoc", and android studio is based on Intellij:
See File->Settings->Editor->General: "show quick documentation on mouse moves",
rather than File->Settings->Editor->General->Code Completion
"Autopopup documentation in (ms) for explicitly invoked completion"
and "Autopopup in (ms)", which has been previously talked about.
I tried many ways mentioned here, especially the preference - editor - general - code completion - show documentation popup in.. isn't working in version 2019.2.2
Finally, i am just using F1 while caret is on the type/method and it displays the documentation nicely. This is not ideal but helpful.
In 2020.1 there is in editor javadocs rendering has been added. Screen shots borrowed from intellij documentation.
On my IntelliJ U on Mac I need to point with cursor on some method, variable etc. and press [cntrl] or [cmd] key. Then click on the link inside popup window which appeared to see JavaDocs
All of the above methods are useful but one basic thing missing you need to have src.zip in your JDK (C:\Program Files\Java\jdk1.8.0_171). I assumed it comes preinstalled but for some reason, it was not present in my installation. Another thing to check is if your project is using the specified (1.8.0_171 in this case) JDK.
The answer is CTRL + P (NOT CTRL + Q)
Someone else posted this answer on JetBrains forum:
The idea is a different IDE. Try to discover its features and try to make the best of it, rather than trying to emulate whatever you used before.
For the most part, Idea has very high usability (much better than Eclipse IMHO) and is streamlined for supporting code editing as best as possible (rather than relying on wizards too much for example).
Javadoc: Ctrl-Q
A quick view of the implementation: Ctrl-Shift-I
Show context: Alt-Q
Show parameters (in a method call): Ctrl-P
Show error description. Ctrl-F1
... plus many more shortcuts to navigate in code and different idea views.
I think it rather nice that you can see just the specific bit of information you are interested in with a simple keystroke.
Have a look at the menus which will also show the possibly modified shortcuts for your keymap.
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Avatar
Jens Voß
Created June 12, 2008, 09:26
And, elsandros, in addition to what Stephen writes: Since you seem to be interested in IDEA's keyboard shortcuts, I highly recommend the "Key Promoter" plugin which helps you memorize the relevant shortcuts quickly.
Also very useful is the "Goto Action" feature, invoked by Ctrl-Shift-A. In the popup, you can enter a keyword (e.g. "Javadoc"), and the IDE tells you the available actions matching your search, along with keyboard shortcuts and the containing action groups (which often also give you a clue about how to navigate to the action using the menu).
Aren't i supposed to be able to do this? Folding is enabled in the Java preferences, but no +/- button appears next to comments. I can fold imports and classes and methods, but not comments. Also, checking the Comments box in "Initially fold these elements" does nothing.
It could be a side-effect of another option setting the code folding for a plugin you don't have.
See bug 153449 for an example (written at the time when Mylyn was called Mylar):
I can enable and disable folding, and I see my editor margin increase/decrease
in size providing a gutter for the code folding markers to appear in, but they
simply aren't there. Also, all of the menu options to expand all and collapse
all are there and enabled but they do nothing.
Actually, I just saw this in my exported preferences:
/instance/org.eclipse.jdt.ui/editor_folding_provider=org.eclipse.mylar.java.ui.editor.foldingprovider
And I don't have Mylar installed. I'm betting this is the problem. I'll try
to get rid of it and see what happens.
In the Java source editor in Eclipse, you could select a block of code, pick it with a mouse click and drop the block of code into another area of the code.
You can't do that for other text editors like XML, HTML, etc. I had to press a key combination before I could use the mouse to move and drop the selected text. I have a new Eclipse set-up now and I can't recall what the key combination is. I tried ctrl-shift, ctrl-alt, alt-shift, and ctrl-shift-alt. None of them work. I had drag-and-drop enabled.
Is there something else on Eclipse that I had installed in my old Eclipse set-up that I forgot to install in my new Eclipse set-up? It shouldn't be because the text editor config has a check box for "enable drag and drop" which I enabled.
Of course, if you are one of those guys who wrote the eclipse text editor, you should also answer this question:
why did you not make the other text editors behave like the Java code editor? Why did you make us into having to do a key-combination to perform drag and drop for the other editors? What's wrong with having all the editors exhibit the same behaviour?
I woogled and googled and could not find any eclipse manual that would tell me what the key combination is. I also could not find it in the local help files. If you required us to use key-combination, why did you not document that in a manual?
My apologies, but I realise I sound a little frustrated now.
The text DnD (Drag and Drop) feature (initially introduced by bug 11624 in 2007) has been slowly extended to various editors, as reported by the bug 231294:
Tested in EclipsePdt-2.2.0.v20100427
Verified fixed for:
PHP files
JS files
Still reproducible in:
CSS files
HTML files
XML files (source view)
So it is still "work in progress".
The relevant blocking issues are:
bug 178104: [DND] Need to revisit dnd API to allow multiple drop targets
bug 173405 Make use of IDragAndDropService (Show Votes)
bug 195655 Drag'n'drop selected text
I can split editor panes horizontally or vertically, but it does not seem possible to view code in two separate physical windows. I am aware that Idea can open multiple projects in separate windows, but I'd like to be able to do this for two files in a single project.
One answer suggested unpinning the tab, but I haven't been able to make that work (I'm on Mac OSX if that matters.)
This seems like a basic feature in today's world of multi-headed workstations. Before moving to an IDE I used to do this regularly with good old Emacs. Is there some trick I am not aware of to make this happen?
This is now possible in IDEA X. Hopefully you're still an IDEA user and can take advantage of this :)
Unfortunately there is no way (as of IDEA 8.0.1) to do what you're asking for. As you pointed out, you can split the editor pane but there is always exactly one editor per IDEA project.
UPDATE: As of IDEA 10 (currently the latest is 10.5), the answer is yes, you can :-)
I work around the limitation by opening one source file in vi, on a second head monitor.
Then work main file within Idea (actually Pycharm).
Update: even with the feature built into pycharm, I still use vi. Works better.
As per #9000's comment, an editor tab can be turned into a new window by dragging the tab outside of IDEA.
Yes- with IDEA X, it is finally possible to open multiple editor windows.