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Java Forum / General / March 2007[JComboBox]Read the index of item with X value.
I've a ComboBox like the follow, obviously in the left column ther'are index and in the right column there are values (for example): 0 32 1 45 2 46 3 58 Now I would to know the index of the determinated item in the combo, (for example 46). The element (46 in this case) is not selected, so I can't use methods like getSelected... So should be useful a method that accept in input a parameter (value number) and return in output correspondent index number. For Example: myMethod(46); that give me 2 in output. How could I resolve? > I've a ComboBox .. >From where? There is no ComboBox in the JSE. Are you perhaps referring to java.awt.Choice, or javax.swing.JComboBox? .. > How could I resolve? 1) Be specific about the classes used, rather than simply 'making the names up, as you go along' 2) .. Andrew T. In addition to my earlier advice.. 2) Refrain from enclosing part of the subject in delimiters like '['/']'. Google Groups (which I am not implying does 'the right thing') will not display any such words in the title as shown on the group page. 3) Do not assume that people who reply to a post take any special notice of the subject, *always* include all relevant parts of the problem in the body. But to your question. A (javax.swing.)JComboBox constructor accepts an array or Vector as an argument. If you keep a reference to the array or Vector, you can perform all the normal operations such structures offer, and that should provide the functionality (as I vaguely recall) that is needed. Andrew T. > In addition to my earlier advice.. > 2) Refrain from enclosing part of the subject in [quoted text clipped - 18 lines] > > Andrew T. so there's no an existing method to do that. I've to do thease operations directly on array of element. Right? (please trim replies) > > A (javax.swing.)JComboBox constructor accepts > > an array or Vector as an argument. ... ... > so there's no an existing method to do that. Not to my knowledge. >..I've to do thease > operations directly on array of element. Right? Not necessarily. You might retrieve the values back from the JCB and check each one individually in a loop. That would end up being much the same as if an array was used, but Vector has the indexOf method that at least does the job in a single code line. I note in your next reply you mention using a DefaultComboBoxModel - that class also has getIndexOf(Object) that sounds useful. Just hold a reference to the DCBM, and query it directly. Even easier (no need to hold a reference).. theComboBox.getModel().getIndexOf("46"); ..might do what is needed. HTH Andrew T. >Even easier (no need to hold a reference).. > theComboBox.getModel().getIndexOf("46"); >..might do what is needed. Some care is needed here to get the data type correct. In the OP's case, I'm guessing that theComboBox.getModel().getIndexOf(new Integer(46)); would be more to the point. Or, of you trust autoboxing enough, theComboBox.getModel().getIndexOf(46); (Also, some necessary casting to DefaultComboBoxModel is left out.) Cheers Bent D  SignatureBent Dalager - bcd@pvv.org - http://www.pvv.org/~bcd powered by emacs > In article <1174916111.565152.257...@o5g2000hsb.googlegroups.com>, > [quoted text clipped - 17 lines] > Bent Dalager - b...@pvv.org -http://www.pvv.org/~bcd > powered by emacs All solutions posted gave me the error: symbol : method getIndexOf(java.lang.Integer) location: interface javax.swing.ComboBoxModel System.out.println(cbxReparto.getModel().getIndexOf(new Integer (3))); 1 error What do you mean about 'some necessary casting'? > In addition to my earlier advice.. > 2) Refrain from enclosing part of the subject in [quoted text clipped - 18 lines] > > Andrew T. PS: JComboBox with DefaultComboBoxModel > 2) Refrain from enclosing part of the subject in > delimiters like '['/']'. Google Groups (which I > am not implying does 'the right thing') will not > display any such words in the title as shown on > the group page. Nonsense. Subject tags (short keywords in []) are common in Usenet, and Google groups handles them just fine (not that that should make any difference either way). Search for "subject tags" to find many examples and even instructions on their use in various newsgroups. They may not be common here but they certainly do no harm. /gordon -- > > 2) Refrain from enclosing part of the subject in > > delimiters like '['/']'. Google Groups (which I [quoted text clipped - 3 lines] > > Nonsense. Find the post with subject line.. [secret] subject line <http://groups.google.com/group/alt.test/topics> (Using GG, of course) Andrew T. > Find the post with subject line.. > [secret] subject line ><http://groups.google.com/group/alt.test/topics> > (Using GG, of course) Your newsreader is apparently broken - get one that isn't instead of expecting others to cater to your whims. /gordon -- > > Find the post with subject line.. > > [secret] subject line > ><http://groups.google.com/group/alt.test/topics> > > (Using GG, of course) > > Your newsreader is apparently broken - Sure. Feel free to ignore the fact that your claims were *wrong*, instead go directly to 'attack mode'. >...get one that isn't instead of > expecting others to cater to your whims. 'Get stuffed Gordon.'* Not everybody has the luxury of being able to run a news client. My comment was designed to assist the OP to get better help from *people* *in* *general*, whether those people are posting through GG, JavaKB (...), or a news client. * Normally I do not issue commands, but 'like for like'. Andrew T. I've not understand what's your problem... Yes, i'm not using newsreader where is the problem??? :| > I've not understand what's your problem... Did you try finding the post I mentioned to Gordon? > Yes, i'm not using newsreader where is the problem??? :| Problem 1 is that sticky '?' key, please fix that. Problem 2 is that (as I mentioned earlier), the post with subject '[something] about a problem' ..reads as.. 'about a problem' ..for some readers. My point is that if you want all words of a subject line to appear for all readers, the most reliable way to achieve that is to put the subject as .. 'something about a problem' ..and leave out the (mostly redundant) '['/']'. This problem may be *caused* by Google Groups (and possibly other web interfaces to usenet, maybe even some news readers), but it *becomes* the problem of whoever wants to communicate something clearly to the widest audience. Do you have any problem with *not* including brackets in the subject lines of future posts? Andrew T. > * Normally I do not issue commands, but > 'like for like'. Are you joking? That's pretty much all you do here. /gordon -- >> * Normally I do not issue commands, but >> 'like for like'. > > Are you joking? That's pretty much all you do here. Perhaps you should re-read Andrew's postings. The word /please/ indicates a request rather than a command. Andrew uses this word regularely. One shouldn't consider that Andrew's intention is to attack someone. If one pays attention on the content of his postings it should get clear that he gives hints on how to post to newsgroups. By following this hints one can get maximum benefit. On this thread Andrew pointed out that Google will hide the part of the subject which is enclosed in brackets. So, where's the problem? On other threads, multi-posting, top-posting, full-quoting is an issue. If possible, I don't answer to multi-postings (in fact, I don't even like to answer cross-postings without follow ups). And I hate full-quotings since often they're unreadable and thus they steal my time. Of course, no one needs to follow anybody's advices. Anybody should feel free to multi-post, top-post, full-quote, ... But no one should be amazed if there'll be no or just a few replies then. Bye Michael Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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