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  • why doesn't hitting enter when a SELECT is focused submit the form?

    - by Marc
    Consider the following HTML: <form action=""> <input /> <select> <option>A</option> <option>B</option> </select> <input type="submit" /> </form> If the focus is on the input (text box) and I hit enter, the form submits. But, if the focus is on the select (dropdown box) and I hit enter, nothing happens. I know I could figure out some JavaScript to override this, but I want to know why hitting enter doesn't just work? Is there something I would break by capturing the enter with JavaScript (maybe some native keyboard accessibility of the dropdown)?

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  • Why is Double.Parse so slow?

    - by alexhildyard
    I was recently investigating a bottleneck in one of my applications, which read a CSV file from disk using a TextReader a line at a time, split the tokens, called Double.Parse on each one, then shunted the results into an object list. I was surprised to find it was actually the Double.Parse which seemed to be taking up most of the time.Googling turned up this, which is a little unfocused in places but throws out some excellent ideas:It makes more sense to work with binary format directly, rather than coerce strings into doublesThere is a significant performance improvement in composing doubles directly from the byte stream via long intermediariesString.Split is inefficient on fixed length recordsIn fact it turned out that my problem was more insidious and also more mundane -- a simple case of bad data in, bad data out. Since I had been serialising my Doubles as strings, when I inadvertently divided by zero and produced a "NaN", this of course was serialised as well without error. And because I was reading in using Double.Parse, these "NaN" fields were also (correctly) populating real Double objects without error. The issue is that Double.Parse("NaN") is incredibly slow. In fact, it is of the order of 2000x slower than parsing a valid double. For example, the code below gave me results of 357ms to parse 1000 NaNs, versus 15ms to parse 100,000 valid doubles.            const int invalid_iterations = 1000;            const int valid_iterations = invalid_iterations * 100;            const string invalid_string = "NaN";            const string valid_string = "3.14159265";            DateTime start = DateTime.Now;                        for (int i = 0; i < invalid_iterations; i++)            {                double invalid_double = Double.Parse(invalid_string);            }            Console.WriteLine(String.Format("{0} iterations of invalid double, time taken (ms): {1}",                invalid_iterations,                ((TimeSpan)DateTime.Now.Subtract(start)).Milliseconds            ));            start = DateTime.Now;            for (int i = 0; i < valid_iterations; i++)            {                double valid_double = Double.Parse(valid_string);            }            Console.WriteLine(String.Format("{0} iterations of valid double, time taken (ms): {1}",                valid_iterations,                ((TimeSpan)DateTime.Now.Subtract(start)).Milliseconds            )); I think the moral is to look at the context -- specifically the data -- as well as the code itself. Once I had corrected my data, the performance of Double.Parse was perfectly acceptable, and while clearly it could have been improved, it was now sufficient to my needs.

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  • Javascript onunload form submit isn't submitting data

    - by Kevin
    I currently have form that checks if a user has unsubmitted changes when they leave the page with a function called through the onunload event. Here's the function: function saveOnExit() { var answer = confirm("You are about to leave the page. All unsaved work will be lost. Would you like to save now?"); if (answer) { document.main_form.submit(); } } And here's the form: <body onunload="saveOnExit()"> <form name="main_form" id="main_form" method="post" action="submit.php" onsubmit="saveScroll()"> <textarea name="comments"></textarea> <input type="submit" name="submit2" value="Submit!"/> </form> I'm not sure what I'm doing wrong here. The data gets submitted and saved in my database if I just press the submit button for the form. However, trying to submit the form through the onunload event doesn't result in anything being stored, from what I can tell. I've tried adding onclick alerts to the submitt button and onsubmit alerts to the form elements and I can verify that the submit button is being triggered and that the form does get submitted. However, nothing gets passed stored in the database. Any ideas as to what I'm doing wrong? Thanks.

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  • Difference between float and double

    - by VaioIsBorn
    I know, i've read about the difference between double precision and single precision etc. But they should give the same results on most cases right ? I was solving a problem on a programming contest and there were calculations with floating point numbers that were not really big so i decided to use float instead of double, and i checked it - i was getting the correct results. But when i send the solution, it said only 1 of 10 tests was correct. I checked again and again, until i found that using float is not the same using double. I put double for the calculations and double for the output, and the program gave the SAME results, but this time it passed all the 10 tests correctly. I repeat, the output was the SAME, the results were the SAME, but putting float didn't work - only double. The values were not so big too, and the program gave the same results on the same tests both with float and double, but the online judge accepted only the double-provided solution. Why ? What is the difference ?

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  • When do you use float and when do you use double

    - by Jakub Zaverka
    Frequently in my programming experience I need to make a decision whether I should use float or double for my real numbers. Sometimes I go for float, sometimes I go for double, but really this feels more subjective. If I would be confronted to defend my decision, I would probably not give sound reasons. When do you use float and when do you use double? Do you always use double, only when memory constraints are present you go for float? Or you use always float unless the precision requirement requires you to use double? Are there some substantial differences regarding computational complexity of basic arithemtics between float and double? What are the pros and cons of using float or double? And have you even used long double?

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  • Problem in form submit through javascript

    - by Durga Dutt
    I am submitting form via javascript by using 'document.FormName.submit()' . But this is giving me error of 'submit is not a function'. I m using IE8 <script typr="text/javascript"> function submitForm() { document.theForm.submit() } </script> <body> <form name="theForm" method="post"> <input type="text" name= "name"> <input type="button" name="submit" value="submit" onclick="submitForm()"> </form> </body> Please help me ?

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  • Auto submit form on clicking specific dropdown - jquery

    - by blasteralfred
    Hi, I have a form like below <form name="testform" id="testform" action="test.php" method="get"> <input name="field1" id="field1" type="text" value=""> <input name="field2" id="field2" type="text" value=""> <select name="dropdown" id="dropdown"> <option value="option1" selected="selected">option1</option> <option value="option2">option2</option> <option value="option3">option3</option> </select> <input type="submit" name="Submit" value="Submit" id="Submit"> </form> I want to submit the form automatically when someone click (or select) an option from the dropdown. How can I make this possible using jquery or something else or simple js. Thanks in advance... :) blasteralfred

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  • Return Double from Boost thread

    - by Benedikt Wutzi
    Hi I have an Boost thread which should return a double. The function looks like this: void analyser::findup(const double startwl, const double max, double &myret){ this->data.begin(); for(int i = (int)data.size() ; i >= 0;i--){ if(this->data[i].lambda > startwl){ if(this->data[i].db >= (max-30)) { myret = this->data[i+1].lambda; std::cout <<"in thread " << myret << std::endl; return; } } } } this function is called by another function: void analyser::start_find_up(const double startwl, const double max){ double tmp = -42.0; boost::thread up(&analyser::findup,*this, startwl,max,tmp); std::cout << "before join " << tmp << std::endl; up.join(); std::cout << "after join " << tmp << std::endl; } Anyway I've tried and googled almost anything but i can't get it to return a value. The output looks like this right now. before join -42 in thread 843.487 after join -42 Thanks for any help.

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  • Multiple Forms with Different Actions using Submit Buttons

    - by Adam Coulson
    I have Two forms in my index.php and am trying to get them to submit and POST their data seperatly Form 1 echo '<form action="process.php?type=news" method="post">'; echo '<table cellspacing="0"><tr><th>'; echo 'Add News to News Feed'; echo '</th></tr><tr><td>'; echo 'Title:<br /><input name="newstitle" type="text" id="add" style="height:16px;width:525px;" size="80" maxlength="186" /><br />'; echo 'Main Body Text:<br /><textarea name="newsfeed" id="add" style="width:525px;height:78px;" maxlength="2000" ></textarea>'; echo '<input style="float:right;margin-top:5px;" id="button" type="submit" value="Submit" />'; echo '</td></tr></table></from>'; And Form 2 echo '<form action="process.php?type=suggest" method="post">'; echo '<table cellspacing="0"><tr><th>'; echo 'Suggest Additions to the Intranet'; echo '</th></tr><tr><td>'; echo '<textarea name="suggest" id="add" style="width:330px;height:60px;" maxlength="800" ></textarea>'; echo '<input style="float:right;margin-top:5px;" id="button" type="submit" value="Submit" />'; echo '</td></tr></table></from>'; I want these both to post and do the action after pressing the submit button, but currently the second form submit to the first forms action How can i fix this??? EDIT: Also i am using .PHP for both the index and process page then using it to echo the forms onto the page Also here is the process.php data $type=$_REQUEST['type']; $suggest=$_POST['suggest']; $newstitle=$_POST['newstitle']; $news=mysql_real_escape_string($_POST['newsfeed']); if ($type == "news") { $sql=mysql_query("SELECT * FROM newsfeed WHERE title = ('$newstitle')"); $number_of_rows = mysql_num_rows($sql); if ($number_of_rows > 0) { echo 'This Title is Already Taken'; } else { $sql="INSERT INTO newsfeed (title, news) VALUES ('$newstitle','$news')"; if (!mysql_query($sql,$con)) { die('Error: ' . mysql_error()); } header('Location: index.php'); exit; } } elseif ($type == "suggest") { $sql="INSERT INTO suggestions VALUES ('$suggest')"; if (!mysql_query($sql,$con)) { die('Error: ' . mysql_error()); } header('Location: index.php'); exit; }

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  • Opening password protected Excel 2007 documents by double clicking from My documents does not work u

    - by erik-van-gorp
    When all of the following conditions are true, excel will open (most of the time) but will not open the document itself. No error is displayed. This only occurs with Excel files, Word and powerpoint do open perfectly. Conditions : OS is "Windows 7 Professional 64-bit" office is "Office 2007 Ultimate". excel file is in .xls (2003 format) excel file is password protected excel file is in "My Documents" (or a subfolder of it) file is double-clicked from explorer under Windows 7. Following options do open the excel file as it should : right click and selecting the (bold) open action single click the file and pressing enter moving the file to the desktop and double-click it. non password protected files do open from the same directory. Actions taken not resolving the problem: - reboot - repair office installation - system restore does not work because of Antivirus application installed (message from system restore, using "Symantec Internet Security 2010") Anyone any idea ?

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  • ajax->form submit onchage event on selectTag keeping submit button on form without click

    - by prashant
    Hi, I am using cakephp 1.1. for my project.I used ajax-form for form creation.In one form, form submitted using onchange event of selectTag taking submit button and giving submit.click for that button.But it peroperly not redirect to view file gives error "cake/libs/model/datasources/dbo_source.php" and submit that form,but I am not getting to which view it is submitting(submittied form to itself).

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  • C++ double division by 0.0 versus DBL_MIN

    - by wonsungi
    When finding the inverse square root of a double, is it better to clamp invalid non-positive inputs at 0.0 or MIN_DBL? (In my example below double b may end up being negative due to floating point rounding errors and because the laws of physics are slightly slightly fudged in the game.) Both division by 0.0 and MIN_DBL produce the same outcome in the game because 1/0.0 and 1/DBL_MIN are effectively infinity. My intuition says MIN_DBL is the better choice, but would there be any case for using 0.0? Like perhaps sqrt(0.0), 1/0.0 and multiplication by 1.#INF000000000000 execute faster because they are special cases. double b = 1 - v.length_squared()/(c*c); #ifdef CLAMP_BY_0 if (b < 0.0) b = 0.0; #endif #ifdef CLAMP_BY_DBL_MIN if (b <= 0.0) b = DBL_MIN; #endif double lorentz_factor = 1/sqrt(b); double division in MSVC: 1/0.0 = 1.#INF000000000000 1/DBL_MIN = 4.4942328371557898e+307

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  • Swap bits in c++ for a double

    - by hidayat
    Im trying to change from big endian to little endian on a double. One way to go is to use double val, tmp = 5.55; ((unsigned int *)&val)[0] = ntohl(((unsigned int *)&tmp)[1]); ((unsigned int *)&val)[1] = ntohl(((unsigned int *)&tmp)[0]); But then I get a warning: "dereferencing type-punned pointer will break strict-aliasing rules" and I dont want to turn this warning off. Another way to go is: #define ntohll(x) ( ( (uint64_t)(ntohl( (uint32_t)((x << 32) >> 32) )) << 32) | ntohl( ((uint32_t)(x >> 32)) ) ) val = (double)bswap_64(unsigned long long(tmp)); //or val = (double)ntohll(unsigned long long(tmp)); But then a lose the decimals. Anyone know a good way to swap the bits on a double without using a for loop?

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  • jQuery partial page refresh after form submit

    - by heeboir
    When using jQuery to submit a form is it possible to place the resulting page (after the submit) inside another HTML element? I'll try to make this clearer. Up to now I've been using Callback methods that among others do a document.forms['form'].submit(); whenever a form has been updated with new information and needs to be refreshed. However, this results in a full page refresh. I'm implementing Partial Page Refresh using jQuery and thought of using something like var newContent = jQuery('#form').submit(); jQuery('#div').load(newContent); However, that does not seem to work as the page is still fully refreshed. The content is correct, however the behaviour seems to be exactly the same as before - so I'm not really sure if what I want is actually possible with jQuery. Any hints and pointers would be helpful. Thanks.

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  • Submit Form Equivalent To WML

    - by Nathan Campos
    I'm playing a little bit with WML with PHP, then I want to know what is the equivalent of this on WML: <form action="upload_file.php" method="post"enctype="multipart/form-data"> <label for="file">File:</label><br /> <input type="file" name="file" id="file" /><br /> <input type="submit" name="submit" value="Submit" /> </form>

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  • HTML form with multiple submit options

    - by phimuemue
    Hi, I'm trying to create a small web app that is used to remove items from a MySQL table. It just shows the items in a HTML table and for each item a button [delete]: item_1 [delete] item_2 [delete] ... item_N [delete] To achieve this, I dynamically generate the table via PHP into a HTML form. This form has then obviously N [delete]-buttons. The form should use the POST-method for transfering data. For the deletion I wanted to submit the ID (primary key in the MySQL table) of the corresponding item to the executing php skript. So I introduced hidden fields (all these fields have the name='ID' that store the ID of the corresponding item. However, when pressing an arbitrary [delete], it seems to submit always just the last ID (i.e. the value of the last ID hidden field). Is there any way to submit just the ID field of the corresponding item without using multiple forms? Or is it possible to submit data from multiple forms with just one submit-button? Or should I even choose any completly different way? The point why I want to do it in just one single form is that there are some "global" parameters that shall not be placed next to each item, but just once for the whole table.

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  • Attach jQuery dialog to Submit button in ASP.NET-MVC

    - by RememberME
    I have a submit button which has been working to submit my form in ASP.NET-MVC. I would like to attach a jQuery dialog to the button click. If the user exits out of the dialog, then I would like to exit from the submit as well. I have dialogs hooked to other buttons, but not submits. How can I do this?

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  • Enable submit button javascript ( asp page )

    - by Filipe Costa
    Good morning. By default, and i don't know why, when the page ends the rendering, i get the submit button disabled. <input type="submit" class="buttonColor" disabled="disabled" id="MyMatrix_ctl10_Form_btnSubmit" value="Enviar" name="MyMatrix$ctl10$Form$btnSubmit"> I need some way to enable it, or else i can't submit the form. How can i do it? Thanks.

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  • Using input type="submit" to change content

    - by Conti
    Okay, I'm pretty sure I'm missing something very obvious here, but I just couldn't find a proper solution so far. What I'm trying to do is simple: Have a user write something into a form, have him submit the form, and write that input into a textarea on the same page. This is my code: <html><head></head> <body> <form name='registration'> <label for="input">Input:</label> <input type="text" id="input"/> <input type="submit" id="submit" value="Submit" onclick="execute()"/> </form> <div id="results"> <span>Result</span> <span><textarea cols="30" rows="5" id="resulttext" readonly="readonly"></textarea> </span> </div> <script> function execute() { var result = document.getElementById("input").value document.getElementById("resulttext").value=result; } </script> </body> </html> Now what happens if I enter something into the form is that the textarea briefly shows my input before reverting back to showing nothing. My guess is that the textarea field is only changed for the duration of the execute() function. When I change input type="submit" to a <button> everything works as intended, but I'm pretty sure I'm not supposed to do that.

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  • Mechanize Submit Form Error: Insufficient items with name '10427'

    - by maneh
    I'm trying to submit a form with Mechanize, I have tried different ways, but the problem persists. Can anyone help me on this. Thank you in advance! This is the form I want to submit: http://www.stpairways.st/ This is the code that I'm using: def stp_airways(url): import re import mechanize br = mechanize.Browser() br.open(url) print br.title() br.select_form(name = "frmbook") br.form['TypeTrajet'] = ["1"] br.form['id_depart'] = ["11967"] br.form['id_arrivee'] = ["10427"] br.form['txtDateAller'] = "5/7/2014" br.form['txtDateRetour'] = "12/7/2014" br.form['TypePassager1u1000r0b1'] = ["1"] br.form['TypePassager2u1000r0b1'] = ["0"] br.form['TypePassager3u1000r0b1'] = ["0"] br.form['CodeIsoDeviseClient'] = ["17,20,23,24,25,26,27,28,29,30,31,33,34,36,37,64,65,67,68,70,73,80,81,95,96,103,147,151,152,159,160,162,169,170TP1TPF"] br.form['CodeIsoDeviseClient'] = ["EUR"] # submit response1 = br.submit() print response1.read()

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  • saving value selected in a list when submit button is cliked

    - by kawtousse
    Hi everyone, In my JSP I have a dropdownlist and a submit button when clicking the submit button I loose the value already selected in my list. I am using the jstl because i need to construct other table corresponding the value selected in my list.For that I must call a submit button but the problem; it reset the value selected I want to know if there is a way to save the value selected in my list even I click a submit button. I work with JSP and eclipse environment. Think you for your help.

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  • Java string to double conversion.

    - by wretrOvian
    Hi, I've been reading up on the net about the issues with handling float and double types in java. Unfortunately, the image is still not clear. Hence, i'm asking here direct. :( My MySQL table has various DECIMAL(m,d) columns. The m may range from 5 to 30. d stays a constant at 2. Question 1. What equivalent data-type should i be using in Java to work (i.e store, retrieve, and process) with the size of the values in my table? (I've settled with double - hence this post). Question 2. While trying to parse a double from a string, i'm getting errors Double dpu = new Double(dpuField.getText()); for example - "1" -> java.lang.NumberFormatException: empty String "10" -> 1.0 "101" -> 10.0 "101." -> 101.0 "101.1" -> 101.0 "101.19" -> 101.1 What am i doing wrong? What is the correct way to convert a string to a double value? And what measures should i take to perform operations on such values?

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  • [C#] Convert string to double with 2 digit after decimal separator

    - by st.stoqnov
    All began with these simple lines of code: string s = "16.9"; double d = Convert.ToDouble(s); d*=100; The result should be 1690.0, but it's not. d is equal to 1689.9999999999998. All I want to do is to round a double to value with 2 digit after decimal separator. Here is my function. private double RoundFloat(double Value) { float sign = (Value < 0) ? -0.01f : 0.01f; if (Math.Abs(Value) < 0.00001) Value = 0; string SVal = Value.ToString(); string DecimalSeparator = System.Globalization.CultureInfo.CurrentCulture.NumberFormat.CurrencyDecimalSeparator; int i = SVal.IndexOf(DecimalSeparator); if (i > 0) { int SRnd; try { // ????? ??????? ????? ???? ?????????? ?????????? SRnd = Convert.ToInt32(SVal.Substring(i + 3, 1)); } catch { SRnd = 0; } if (SVal.Length > i + 3) SVal = SVal.Substring(0, i + 3); //SVal += "00001"; try { double result = (SRnd >= 5) ? Convert.ToDouble(SVal) + sign : Convert.ToDouble(SVal); //result = Math.Round(result, 2); return result; } catch { return 0; } } else { return Value; } But again the same problem, converting from string to double is not working as I want. A workaround to this problem is to concatenate "00001" to the string and then use the Math.Round function (commented in the example above). This double value multiplied to 100 (as integer) is send to a device (cash register) and this values must be correct. I am using VS2005 + .NET CF 2.0 Is there another more "elegant" solution, I am not happy with this one.

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