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问题 I want to override the default integer constructors in Haskell so they produce strings (mostly for curiosity, but temporarily to make a nice input alternative for LaTeX's \frac{}{} inconvenience). I wanted to be able to use the language itself, instead of a special parser, but I guess that's probably not going to work out... module Main where import Prelude hiding ((+)) newtype A = A Int deriving (Eq, Show, Num) default (A) (+) :: A -> (A -> String) (A a) + (A b) = (show a) ++ " + " ++ (show

问题 Is it possible to change direction of $("selector").show('slow') and hide('slow') effects in jQuery? I can define directions for other effects such as slide and clip, but there's no option for show or hide('slow') 回答1: show() is just an arbitrary function to display an element on a page. Without the argument it wouldn't even have an animation. If you want access to more elaborate animations and control the direction it fades in on you will need to use .animate() Or use an extra library that

问题 Do slideUp('slow') and hide('slow') result in the same animation effects? Example Code: $(document).ready(function(){ $("#hide").click(function(){ $("p").hide('slow'); }); $("#show").click(function(){ $("p").show('slow'); }); }); <p>If you click on the "Hide" button, I will disappear.</p> <button id="hide">Hide</button> <button id="show">Show</button> 回答1: No. .slideUp('slow') animates the height and vertical padding to zero. .hide('slow') also animates the width, horizontal padding, and

问题 I'm trying to learn some jQuery and I can't figure it out, how to show a text field (ID-based of course) when I select a specific option in my select tag. I've Google'd for a answer to my problem, but I haven't find anything yet. There for I'm asking you how I can fix this. See below how I want it. As default: Select tag Option 1 Option 2 Option 3 Text field which is hidden by default. If I choose Option 1 , the text field remains hidden. If I choose Option 2 the result is the same as the

问题 I want to Show/Hide multiple divs on the same class using jQuery toggle. Currently, the button show/hides all divs. How can I make it toggle one div without making the class unique? Fiddle demo. jQuery: $(".button").click(function() { $(".comment").toggle(); }); HTML: <div class="comment"> Comment 1 </div> <button class="button">Show Comment</button> <br/> <div class="comment"> Comment 2 </div> <button class="button">Show Comment</button> 回答1: You need to find the comment relative to the

问题 I have HTML CODE below: $('input[type="radio"]').click(function(){ if($(this).attr("value")=="ABC"){ $(".Box").hide('slow'); } if($(this).attr("value")=="PQR"){ $(".Box").show('slow'); } }); <table> <tr> <td align="left" height="45"> <input type="radio" class="radioBtn" name="Radio" id="Radio" value="ABC" required> ABC <input class="radioBtn" type="radio" name="Radio" id="Radio" value="PQR" required> PQR <div class="Box" style="display:none">Text</div> </td> </tr> </table> All above code is

问题 I have an current location annotation (blue dot) showing in mapkit. Annotation shows after taping the blue dot, how can I have the annotation showing by default?, when I start the view? whit out tapping the pin. - (void)mapView:(MKMapView *)mv didAddAnnotationViews:(NSArray *)views { for(MKAnnotationView *annotationView in views) { if(annotationView.annotation == mv.userLocation) { self.mapView.userLocation.title= @"Current"; self.mapView.userLocation.subtitle= @"Location"; MKCoordinateRegion

问题 Is there any equivalent to MySQL's SHOW CREATE TABLE <tablename> in informix? I would like to run it in the SQL Manager on the Server Studio and would also like to obtain information about a tables columns and their types. Is this possible? I've found the systables, syscolumns and information schema, but wasn't lucky with the results I got with the output of select * from... . 回答1: I don't know such SQL command. From command line you can use dbschema utility: C:\Informix>dbschema -t abc -d

问题 I have the following: container.dialog().bind('dialogopen', function(event, ui) { ... if (someCondition) { $(this).dialog('close'); // the dialog is not closed! } } How I should make it work? Unfortunately there is no 'beforeopen' event to be hooked. 回答1: The problem here is you need to bind the event before it happens. Currently you're calling .dialog() which opens the dialog (unless autoOpen: false is a provided option). This means before your .bind(....) runs, the event already occured.

问题 I have a div <div id="fade_bg"> <div id="login_div"> <form action="../classes/login/Authenticator.php" method="post"> <p>username: <input type="text" name="username" /></p> <p>password: <input type="password" name="password" /></p> <p><input type="submit" name="login" /></p> </form> <p><a id="cancel" href="#">cancel</a> </div> </div> That I only want to show when <a id="login" href="">Admin login</a> is clicked. I used $(function() { $('a#login').click(function() { $('#fade_bg').show(); $('