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  • Why do I need to close fds when reading and writing to the pipe?

    - by valentimsousa
    However, what if one of my processes needs to continuously write to the pipe while the other pipe needs to read? This example seems to work only for one write and one read. I need multi read and write void executarComandoURJTAG(int newSock) { int input[2], output[2], estado, d; pid_t pid; char buffer[256]; char linha[1024]; pipe(input); pipe(output); pid = fork(); if (pid == 0) {// child close(0); close(1); close(2); dup2(input[0], 0); dup2(output[1], 1); dup2(output[1], 2); close(input[1]); close(output[0]); execlp("jtag", "jtag", NULL); } else { // parent close(input[0]); close(output[1]); do { read(newSock, linha, 1024); /* Escreve o buffer no pipe */ write(input[1], linha, strlen(linha)); close(input[1]); while ((d = read(output[0], buffer, 255))) { //buffer[d] = '\0'; write(newSock, buffer, strlen(buffer)); puts(buffer); } write(newSock, "END", 4); } while (strcmp(linha, "quit") != 0); } }

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  • Saving information in the IO System

    - by djTeller
    Hi Kernel Gurus, I need to write a kernel module that simulate a "multicaster" Using the /proc file system. Basically it need to support the following scenarios: 1) allow one write access to the /proc file and many read accesses to the /proc file. 2) The module should have a buffer of the contents last successful write. Each write should be matched by a read from all reader. Consider scenario 2, a writer wrote something and there are two readers (A and B), A read the content of the buffer, and then A tried to read again, in this case it should go into a wait_queue and wait for the next message, it should not get the same buffer again. I need to keep a map of all the pid's that already read the current buffer, and in case they try to read again and the buffer was not changed, they should be blocked until there is a new buffer. I'm trying to figure it there is a way i can save that info without a map. I heard there are some redundant fields inside the I/O system the I can use to flag a process if it already read the current buffer. Can someone give me a tip where should i look for that field ? how can i save info on the current process without keeping a "map" of pid's and buffers ? Thanks!

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  • How do I load new pages into my current jQuery colorbox?

    - by thinkswan
    I'm having a bit of trouble loading pages into an already-existing colorbox. I have a colorbox opened by clicked a link that is bound by the following code: $("a.ajaxAddPage").colorbox({ onComplete: function(){ $('ul#addPage li a').click(function() { $.fn.colorbox({href: $(this).attr('href')}); return false; }); } }); The following HTML is loaded into that colorbox via AJAX: <div class='colorboxWindow'> <ul id='addPage'> <li><a href='addCat.php'>Add Category</a></li> <li><a href='addPage.php' class='current'>Add New Page</a></li> <li><a href='addPage2.php'>Add Another Page</a></li> </ul> <h3>Add New Page...</h3> </div> I'm trying to have each of those 3 links open in the current colorbox when they are clicked. With my onComplete binding above, this works for the first click, but the next click just opens like a normal page. If I add another onComplete to the $.fn.colorbox() call in the above code, then the 2nd click will also load in the same colorbox, but the 3rd will not. Is there a way to just bind all future clicks to open in the same colorbox? I don't know much about event binding yet. If you need clarification, please ask.

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  • ORA-06502: PL/SQL: numeric or value error: character string buffer too small with Oracle aggregate f

    - by Tunde
    Good day gurus, I have a script that populates tables on a regular basis that crashed and gave the above error. The strange thing is that it has been running for close to 3 months on the production system with no problems and suddenly crashed last week. There has not been any changes on the tables as far as I know. Has anyone encountered something like this before? I believe it has something to do with the aggregate functions I'm implementing in it; but it worked initially. please; kindly find attached the part of the script I've developed into a procedure that I reckon gives the error. CREATE OR REPLACE PROCEDURE V1 IS --DECLARE v_a VARCHAR2(4000); v_b VARCHAR2(4000); v_c VARCHAR2(4000); v_d VARCHAR2(4000); v_e VARCHAR2(4000); v_f VARCHAR2(4000); v_g VARCHAR2(4000); v_h VARCHAR2(4000); v_i VARCHAR2(4000); v_j VARCHAR2(4000); v_k VARCHAR2(4000); v_l VARCHAR2(4000); v_m VARCHAR2(4000); v_n NUMBER(10); v_o VARCHAR2(4000); -- -- Procedure that populates DEMO table BEGIN -- Delete all from the DEMO table DELETE FROM DEMO; -- Populate fields in DEMO from DEMOV1 INSERT INTO DEMO(ID, D_ID, CTR_ID, C_ID, DT_NAM, TP, BYR, ENY, ONG, SUMM, DTW, REV, LD, MD, STAT, CRD) SELECT ID, D_ID, CTR_ID, C_ID, DT_NAM, TP, TO_NUMBER(TO_CHAR(BYR,'YYYY')), TO_NUMBER(TO_CHAR(NVL(ENY,SYSDATE),'YYYY')), CASE WHEN ENY IS NULL THEN 'Y' ELSE 'N' END, SUMMARY, DTW, REV, LD, MD, '1', SYSDATE FROM DEMOV1; -- LOOP THROUGH DEMO TABLE FOR j IN (SELECT ID, CTR_ID, C_ID FROM DEMO) LOOP Select semic_concat(TXTDESC) INTO v_a From GEOT WHERE ID = j.ID; SELECT COUNT(*) INTO v_n FROM MERP M, PROJ P WHERE M.MID = P.COD AND ID = j.ID AND PROAC IS NULL; IF (v_n > 0) THEN Select semic_concat(PRO) INTO v_b FROM MERP M, PROJ P WHERE M.MID = P.COD AND ID = j.ID; ELSE Select semic_concat(PRO || '(' || PROAC || ')' ) INTO v_b FROM MERP M, PROJ P WHERE M.MID = P.COD AND ID = j.ID; END IF; Select semic_concat(VOCNAME('P02',COD)) INTO v_c From PAR WHERE ID = j.ID; Select semic_concat(VOCNAME('L05',COD)) INTO v_d From INST WHERE ID = j.ID; Select semic_concat(NVL(AUTHOR,'Anon') ||' ('||to_char(PUB,'YYYY')||') '||TITLE||', '||EDT) INTO v_e From REFE WHERE ID = j.ID; Select semic_concat(NAM) INTO v_f FROM EDM E, EDO EO WHERE E.EDMID = EO.EDOID AND ID = j.ID; Select semic_concat(VOCNAME('L08', COD)) INTO v_g FROM AVA WHERE ID = j.ID; SELECT or_concat(NAM) INTO v_o FROM CON WHERE ID = j.ID AND NAM = 'Unknown'; IF (v_o = 'Unknown') THEN Select or_concat(JOBTITLE || ' (' || EMAIL || ')') INTO v_h FROM CON WHERE ID = j.ID; ELSE Select or_concat(NAM || ' (' || EMAIL || ')') INTO v_h FROM CON WHERE ID = j.ID; END IF; Select commaencap_concat(COD) INTO v_i FROM PAR WHERE ID = j.ID; IF (v_i = ',') THEN v_i := null; ELSE Select commaencap_concat(COD) INTO v_i FROM PAR WHERE ID = j.ID; END IF; Select commaencap_concat(COD) INTO v_j FROM INST WHERE ID = j.ID; IF (v_j = ',') THEN v_j := null; ELSE Select commaencap_concat(COD) INTO v_j FROM INST WHERE ID = j.ID; END IF; Select commaencap_concat(COD) INTO v_k FROM SAR WHERE ID = j.ID; IF (v_k = ',') THEN v_k := null; ELSE Select commaencap_concat(COD) INTO v_k FROM SAR WHERE ID = j.ID; END IF; Select commaencap_concat(CONID) INTO v_l FROM CON WHERE ID = j.ID; IF (v_l = ',') THEN v_l := null; ELSE Select commaencap_concat(CONID) INTO v_l FROM CON WHERE ID = j.ID; END IF; Select commaencap_concat(PROID) INTO v_m FROM PRO WHERE ID = j.ID; IF (v_m = ',') THEN v_m := null; ELSE Select commaencap_concat(PROID) INTO v_m FROM PRO WHERE ID = j.ID; END IF; -- UPDATE DEMO TABLE UPDATE DEMO SET GEOC = v_a, PRO = v_b, PAR = v_c, INS = v_d, REFER = v_e, ORGR = v_f, AVAY = v_g, CON = v_h, DTH = v_i, INST = v_j, SA = v_k, CC = v_l, EDPR = v_m, CTR = (SELECT NAM FROM EDM WHERE EDMID = j.CTR_ID), COLL = (SELECT NAM FROM EDM WHERE EDMID = j.C_ID) WHERE ID = j.ID; END LOOP; END V1; / The aggregate functions, commaencap_concat (encapsulates with a comma), or_concat (concats with an or) and semic_concat(concats with a semi-colon). the remaining tables used are all linked to the main table DEMO. I have checked the column sizes and there seems to be no problem. I tried executing the SELECT statements alone and they give the same error without populating the tables. Any clues? Many thanks for your anticipated support.

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  • How can I force PHP's fopen() to return the current version of a web page?

    - by Edward Tanguay
    The current content of this google docs page is: However, when reading this page with the following PHP fopen() script, I get an older, cached version: I've tried two solutions proposed in this question (a random attribute and using POST) and I also tried clearstatcache() but I always get the cached version of the web page. What do I have to change in the following script so that fopen() returns the current version of the web page? <?php $url = 'http://docs.google.com/View?id=dc7gj86r_32g68627ff&amp;rand=' . getRandomDigits(10); echo $url . '<hr/>'; echo loadFile($url); function loadFile($sFilename) { clearstatcache(); if (floatval(phpversion()) >= 4.3) { $sData = file_get_contents($sFilename); } else { if (!file_exists($sFilename)) return -3; $opts = array('http' => array( 'method' => 'POST', 'content'=>'' ) ); $context = stream_context_create($opts); $rHandle = fopen($sFilename, 'r'); if (!$rHandle) return -2; $sData = ''; while(!feof($rHandle)) $sData .= fread($rHandle, filesize($sFilename)); fclose($rHandle); } return $sData; } function getRandomDigits($numberOfDigits) { $r = ""; for($i=1; $i<=$numberOfDigits; $i++) { $nr=rand(0,9); $r .= $nr; } return $r; } ?>

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  • JavaScript: Achieving precise animation end values?

    - by bobthabuilda
    I'm currently trying to write my own JavaScript library. I'm in the middle of writing an animation callback, but I'm having trouble getting precise end values, especially when animation duration times are smaller. Right now, I'm only targeting positional animation (left, top, right, bottom). When my animations complete, they end up having an error margin of 5px~ on faster animations, and 0.5px~ on animations 1000+ ms or greater. Here's the bulk of the callback, with notes following. var current = parseFloat( this[0].style[prop] || 0 ) // If our target value is greater than the current , gt = !!( value > current ) , delta = ( Math.abs(current - value) / (duration / 13) ) * (gt ? 1 : -1) , elem = this[0] , anim = setInterval( function(){ elem.style[prop] = ( current + delta ) + 'px'; current = parseFloat( elem.style[prop] ); if ( gt && current >= value || !gt && current <= value ) clearInterval( anim ); }, 13 ); this[0] and elem both reference the target DOM element. prop references the property to animate, left, top, bottom, right, etc. current is the current value of the DOM element's property. value is the desired value to animate to. duration is the specified duration (in ms) that the animation should last. 13 is the setInterval delay (which should roughly be the absolute minimal for all browsers). gt is a var that is true if value exceeds the initial current, else it is false. How can I resolve the error margin?

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  • How to get current datetime on windows command line, in a suitable format for using in a filename?

    - by Rory
    What's a windows command line statement(s) I can use to get the current datetime in a format that I can put into a filename? I want to have a .bat file that zips up a directory into an archive with the current date & time as part of the name, eg "Code_2008-10-14_2257.zip". Is there any easy way I can do this, independent of the regional settings of the machine? I don't really mind about the date format, ideally it'd be yyyy-mm-dd but anything simple is fine. So far I've got this, which on my machine gives me "Tue_10_14_2008_230050_91" rem Get the datetime in a format that can go in a filename. set _my_datetime=%date%_%time% set _my_datetime=%_my_datetime: =_% set _my_datetime=%_my_datetime::=% set _my_datetime=%_my_datetime:/=_% set _my_datetime=%_my_datetime:.=_% rem now use the timestamp by in a new zip file name "d:\Program Files\7-Zip\7z.exe" a -r Code_%_my_datetime%.zip Code I can live with this but it seems a bit clunky. Ideally it'd be briefer and have the format mentioned earlier. I'm using Windows Server 2003 and Win XP Pro. I don't want to install additional utilities to achieve this (although I realise there are some that will do nice date formatting).

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  • Groovy Grails, How do you stream or buffer a large file in a Controller's response?

    - by Julian Noye
    Hi Guys I have a controller that makes a connection to a url to retrieve a csv file. I am able to send the file in the response using the following code, this works fine. def fileURL = "www.mysite.com/input.csv" def thisUrl = new URL(fileURL); def connection = thisUrl.openConnection(); def output = connection.content.text; response.setHeader "Content-disposition", "attachment; filename=${'output.csv'}" response.contentType = 'text/csv' response.outputStream << output response.outputStream.flush() However I don't think this method is inappropriate for a large file, as the whole file is loaded into the controllers memory. I want to be able to read the file chunk by chunk and write the file to the response chunk by chunk. Any ideas?

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  • How do you obtain a formatted date and time for the current locale in C?

    - by jwaddell
    What C function should I call to obtain a formatted date and time for the locale where the program is being executed? I'm asking this question because I have run into a problem using the ClamAV daemon API. The VERSION command returns the date and time of the latest virus definitions, but the code uses a call to ctime to format it. As far as I can tell ctime does not format the datetime according to the current locale and uses the English abbreviations for days of the week and the month in the returned string. This causes problems as my Java program which uses the ClamAV API does respect the current locale and thus expects the day of the week and month name to have the local abbreviations. The datetime format would need to be in the same format as that produced by ctime: Www Mmm dd hh:mm:ss yyyy Where Www is the weekday, Mmm the month in letters, dd the day of the month, hh:mm:ss the time, and yyyy the year. I could rewrite the Java program to always assume English dates but I'd be happier to submit a patch to ClamAV as it seems like a bug on their side to me.

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  • WSASend() with more than one buffer - could complete incomplete?

    - by Poni
    Say I post the following WSASend call (Windows I/O completion ports without callback functions): void send_data() { WSABUF wsaBuff[2]; wsaBuff[0].len = 20; wsaBuff[1].len = 25; WSASend(sock, &wsaBuff[0], 2, ......); } When I get the "write_done" notification from the completion port, is it possible that wsaBuff[1] will be sent completely (25 bytes) yet wsaBuff[0] will be only partially sent (say 7 bytes)?

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  • How to get the data buffer of screen in screen stack in Android?

    - by Glory Jiang
    Currently I want to develop one Activity to allow the user to see the screens/activites of all running tasks , then the user can select one of them to switch it to foreground. As I known, HTC Sence seems already to have this implementation for Home screen, to display the thumbnail of all Home panels in one screen. Does anybody know how to access screen stack in Android? Thanks.

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  • Do you know a date picker to quickly pick one day of the current week?

    - by Murmelschlurmel
    Most date pickers allow you to pick the date from a tine calendar or enter the date by hand. For example http://jqueryui.com/demos/datepicker/ This requires - two clicks (one to display the calendar and one to select the correct date) - good eyesight (usually the pop-up calendar is very small) - and good hand-eye coordination to pick the correct date in the tiny calendar with your mouse. That's no problem for power users, but a hassle for older people and computer beginners. I found a website with a different approach. It seems like their users mostly select dates of the current week. So they listed all the days of the week in a bar together with the weekday. The current day is marked in another color. There is a tiny calender icon on the right hand that opens up a regular date picker. That gives you access to all regular date picker functionality. Here is a screenshot: http://mite.yo.lk/assets/img/tour/de/zeiten-erfassen.png Do you know of any jquery plugin which has a similar feature? If not, do you any other plugin or widget which would help me speed up development ? Thank you!

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  • How can I stop a movie (from current frame) playing when I click on next frame - FLASH CS4?

    - by ladygeekgeek
    I have four movie clips (.f4v) in 4 frames in a movie with watch buttons.. This movie has them been imported into a main movie container that has next and previous buttons. However if i play a movie then hit next frame, the movie continues to play in the background. How can I shop this? The code below shows one of the actionscripts for a movie clip and then the main actionscript in the main movie. I am a flash newbie, so all help appreciated. Many thanks. stop(); watch1_btn.addEventListener(MouseEvent.CLICK, playMovie1); function playMovie1(event:MouseEvent):void { movie1_mc.play(); } // Button Listeners next_btn.addEventListener(MouseEvent.CLICK, nextSection); prev_btn.addEventListener(MouseEvent.CLICK, prevSection); function nextSection(event:MouseEvent):void { var thisLabel:String = pages_mc.currentLabel; // gets current frame label as string var thisLabelNum:String = thisLabel.replace("sct", ""); // cuts the leading letters off of the number var curNumber:Number = Number(thisLabelNum); // converts that string number to a real number if (curNumber < 5) { var nextNum:Number = curNumber + 1; // adds 1 to the number so we can go to next frame label pages_mc.gotoAndStop("sct" + nextNum); // This allows us to go to the next frame label } } /////////////////////////////////////////////////////////////////////////// function prevSection(event:MouseEvent):void { var thisLabel:String = pages_mc.currentLabel; // gets current frame label as string var thisLabelNum:String = thisLabel.replace("sct", ""); // cuts the leading letters off of the number var curNumber:Number = Number(thisLabelNum); // converts that string number to a real number var prevNum:Number = curNumber - 1; // subtracts 1 from the number so we can go to next frame label pages_mc.gotoAndStop("sct" + prevNum); // This allows us to go to the previous frame label }

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  • .next is undefined, jquery plugin problem

    - by ndelangen
    I'm trying to create my own plugin. But I'm having trouble getting things right. It appears when I'm trying to traverse inside .each things go wrong. I'm trying to go to the next item every 6 seconds by fading. jQuery(function($){ $.fn.rotator = function(options){ this.each(function() { var container = $(this); var images = container.children(); //Set the opacity of all images to 0 images.css({opacity: 0.0}); //Get the first image and display it (gets set to full opacity) $('div:first',this).css({opacity: 1.0}).addClass('show'); //Call the rotator function to run the slideshow, 6000 = change to next image after 6 seconds var obj = $(this); setInterval(nextimage(obj),6000); }); }; // rotate function function nextimage(obj) { var container = $(obj); var images = container.children(); //Get the current image var current = (images.hasClass('show')? images.hasClass('show') : images.first()); //Get next image, when it reaches the end, rotate it back to the first image var next = ((current.next().length) ? ((current.next().hasClass('show')) ? images.first() :current.next()) : images.first()); //Set the fade in effect for the next image, the show class has higher z-index next.css({opacity: 0.0}) .addClass('show') .animate({opacity: 1.0}, 1000); //Hide the current image current.animate({opacity: 0.0}, 1000) .removeClass('show'); }; }); $(document).ready(function(){ $("#bg").rotator({ }) }); The error I get is: current.next is not a function Line 35 Line 35 = var next = ((current.next().length) ? ((current.next().hasClass('show')) ? images.first() :current.next()) : images.first()); Can someone tell me what I'm doing wrong?

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  • OpenGL fast texture drawing with vertex buffer objects. Is this the way to do it?

    - by Matthew Mitchell
    Hello. I am making a 2D game with OpenGL. I would like to speed up my texture drawing by using VBOs. Currently I am using the immediate mode. I am generating my own coordinates when I rotate and scale a texture. I also have the functionality of rounding the corners of a texture, using the polygon primitive to draw those. I was thinking, would it be fastest to make a VBO with vertices for the sides of the texture with no offset included so I can then use glViewport, glScale (Or glTranslate? What is the difference and most suitable here?) and glRotate to move the drawing position for my texture. Then I can use the same VBO with no changes to draw the texture each time. I could only change the VBO when I need to add coordinates for the rounded corners. Is that the best way to do this? What things should I look out for while doing it? Is it really fastest to use GL_TRIANGLES instead of GL_QUADS in modern graphics cards? Thank you for any answer.

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  • How to replace a region in emacs with yank buffer contents?

    - by Mad Wombat
    When I use VIM or most modeless editors (Eclipse, NetBeans etc.) I frequently do the following. If I have similar text blocks and I need to change them all, I will change one, copy it (or use non-deleting yank), select next block I need and paste the changed version over it. If I do the same thing in emacs (select region and paste with C-y), it doesn't replace the region, it just pastes at the cursor position. What is the way to do this in emacs?

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  • VST plugin : using FFT on audio input buffer with arbitrary size, how ?

    - by Led
    I'm getting interested in programming a VST plugin, and I have a basic knowledge of audio dsp's and FFT's. I'd like to use VST.Net, and I'm wondering how to implement an FFT-based effect. The process-code looks like public override void Process(VstAudioBuffer[] inChannels, VstAudioBuffer[] outChannels) If I'm correct, normally the FFT would be applied on the input, some processing would be done on the FFT'd data, and then an inverse-FFT would create the processed soundbuffer. But since the FFT works on a specified buffersize that will most probably be different then the (arbitrary) amount of input/output-samples, how would you handle this ?

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  • How do I build a python string from a raw (binary) ctype buffer?

    - by fcrazy
    I'm playing with Python and ctypes and I can't figure out how to resolve this problem. I call to a C function which fills a raw binary data. My code looks like this: class Client(): def __init__(self): self.__BUFSIZE = 1024*1024 self.__buf = ctypes.create_string_buffer(self.__BUFSIZE) self.client = ctypes.cdll.LoadLibrary(r"I:\bin\client.dll") def do_something(self): len_written = self.client.fill_raw_buffer(self.__buf, self.__BUFSIZE) my_string = repr(self.__buf.value) print my_string The problem is that I'm receiving binary data (with 0x00) and it's truncated when I tried to build my_string. How can I build my_string if self._buf contains null bytes 0x00? Any idea is welcome. Thanks

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  • In OCaml, how can I create an out_channel which writes to a string/buffer instead of a file on disk

    - by Tianyi Cui
    I have a function of type in_channel -> out_channel -> unit which will output something to an out_channel. Now I'd like to get its output as a string. Creating temporary files to write and read it back seems ugly, so how can I do that? Is there any other methods to create out_channel besides Pervasives.open_out family? Actually, this function implemented a repl. What I really need is to test it programmatically, so I'd like to first wrap it to a function of type string -> string. For creating the in_channel, it seems I can use Scanf.Scanning.from_string, but I don't know how to create the out_channel parameter.

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  • change images by clicking left and right

    - by Qin
    I want to display an image in the center of the page, then 2 buttons, left, and right, when I click on left, the image changes to previous one, and move to next image by clicking right. And my question is, the code doesn't work..=.=, very obvious, can anybody tell me where the mistakes are? <table id="frontpage"> <tr> <td><input type="button" id="left" value="left"/></td> <td><img id="image" alt="Image" src="./image/guildwars2/gw2_fight.jpg"/></td> <td><input type="button" id="right" value="right"/></td> </tr> </table> $(document).ready(function(){ var image=new Array(); var current=0; image[0]=new Image(); image[0].src="./image/guildwars2/gw2_fight.jpg"; image[1]=new Image(); image[1].src="./image/diablo3/d3.jpg"; image[2]=new Image(); image[2].src="./image/dota2/catOnWater.jpg"; $("#left").click(function(){ if(current-1<0){ current=image.length-1; $("#image").attr("src")=image[current].src; } else{ --current; $("#image").attr("src")=image[current].src; } }); $("#right").click(function(){ if(current+1>image.length-1){ current=0; $("#image").attr("src")=image[current].src; } else{ ++current; $("#image").attr("src")=image[current].src; } }); })

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  • Target a link if that link links to the current page?

    - by Des
    this may be a stupid question as I can't seem to find an answer :P Is there a way with javascript/jQuery to Target all links on a page ONLY if they link to the current page? Say i've got a static sidebar on ALL pages, for intents and purposes: <ul id="sidebar"> <li><a href="/one">One</a></li> <li><a href="/two">Two</a></li> <li><a href="/three">Three</a></li> </ul> Notice the code for ALL of them is the same. Let's say I'm on "www.domain.com/two" - Is there a way to target <li><a href="#">Two</a></li> because it's linking to the current page? ***ANSWERED***** The guy deleted his answer - but I used it to create this - var linksToCurrentPage = $('a[href="' + window.location.href + '"]'); if (linksToCurrentPage) { $('a').addClass('currently-active'); }; which worked :)

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  • How can I filter using the current value of a text box in a jQuery selector?

    - by spudly
    I have a validation script that checks for data-* attributes to determine which fields are required. If an element has the 'data-required-if' attribute (which has a jQuery selector as it's value), it checks to see if any elements are found that match that selector. If any are found, the field is required. It does something similar to the following: $('[data-required-if]').each(function () { var selector = $(this).attr('data-required-if'), required = false; if ( !$(selector).length ) { required = true; // do something if this element is empty } }); This works great, but there's a problem. When you use the attribute selector to filter based on the current value of a text field, it really filters on the initial value of the text field. <input type='text' id='myinput' value='initial text' /> <input type='text' id='dependent_input' value='' data-required-if="#myinput[value='']" /> // Step 1: type "foobar" in #myinput // Step 2: run these lines of code: <script> $('#myinput').val() //=> returns "foobar" $('#myinput[value="foobar"]').length //=> returns 0 </script> I understand why it's doing that. jQuery probably uses getAttribute() in the background. Is there any other way to filter based on the current value of an input box using purely jQuery selectors?

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