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问题 Hello so I am working on a vertical scrolling site where fixed central image (the main character) hide and show depending on where the user is on the page using .scrolltop. The only problem I have is that when the page loads the first time, every single central image loads at once and is displayed. Once you begin scrolling it works correctly from the point on, it seems to only happen when the page is first loaded. What am I writing wrong in my script? I think it has to do with the .hide

问题 I have a div element #btns that is hidden by default. It should be displayed on scrolling 200px from top and again hidden after 500px from top. Here is my (non-working) code: $(window).scroll(function() { if ($(this).scrollTop()>200) { $('#btns').fadeIn(); } elseif ($(this).scrollTop()<500) { $('#btns').fadeIn(); } else { $('#btns').fadeOut(); } }); 回答1: You can add a class hide in button like this: $(function() { $(window).scroll(function() { console.log('scrolling ', $(window).scrollTop(),

问题 I know that on instantiation of a Quill editor, there is a toolbar visibility option. Is there a way that I can change this toolbar visibility dynamically after the editor is instantiated? options = { debug: 'info', placeholder: "Place your content here", readOnly: false, theme: 'snow', modules: { toolbar: toolbarOptions --> i want to change this property as false at runtime }, }; 回答1: To clarify the option is not just visibility, it's whether to create a toolbar at all or not. A toolbar

问题 I can't use the most basic procedure, show , as it throws an error: Msg 2812, Level 16, State 62, Line 1 Could not find stored procedure 'show'. I used: SHOW DATABASES Please help me find answers to this issue. 回答1: To list all Databases in SQL Server, Select * from sys.databases To exclude in-built DBs, Select * from sys.databases WHERE name NOT IN ('master', 'tempdb', 'model', 'msdb'); 回答2: Try to refresh local Cache which is under the Intellisense. 来源： https://stackoverflow.com/questions

问题 here is the question: <div class="dep-wrap"> <div class="dep"> <div class="dim"></div> </div> <div class="dep"> <div class="dim"></div> </div> <div class="dep"> <div class="dim"></div> </div> </div> Initially all dim s are hidden, when I hover any dep div I need to make sure its child dim remains hidden and show all other dim s. Is it possible to do with pure CSS with this HTML structure or if there are mode elements between dep and dim ? Thank you. 回答1: Here is a JavaScript solution. var dep

问题 I am new to javascript and I cant seam to hide the div's to start with, I can get the divs to switch between each other any help would be great <script type="text/javascript"> function show(elementId) { document.getElementById("id1").style.display="none"; document.getElementById("id2").style.display="none"; document.getElementById("id3").style.display="none"; document.getElementById(elementId).style.display="block"; } </script> <button type="button" onclick="show('id1');">Button 1</button>

问题 I'm using a mac and when I do the following with matplotlib: import matplotlib.pyplot as plt import matplotlib.mlab as mlab import pylab as P ... plt.plot(x,y) plt.show() <-- nothing happens plt.savefig('figure.png') <-- works fine So, plt.show does not open a window or anything while plt.savefig works fine. What could be the problem? 回答1: Pyplot will only pop up a figure window if matplotlib.rcParams['interactive'] == True This is the case if you: have previous called plt.ion() in your

问题 I'm trying to display one of two layouts depending on whether a checkbox is checked or not. Only using widgets I can do the following which works fine: (each widget in this example is a QLineEdit) myCheckbox.stateChanged.connect(switchControls) def switchControls (self, state): if state == 2: self.widget1.show() self.widget2.hide() else: self.widget1.hide() self.widget2.show() However, since I want to add a descriptive label to each QLineEdit, I need to combine a QLineEdit+QLabel in a layout

问题 In My App, I have a QWidget which is not showing after I call show() , even though isVisible returns true . This widget is created from an event of the main application window. But when its started on its own, i.e., as the only widget on an app, it shows up normally. Anyone knows what may cause this behavior? Other widgets in my app show up normally only this one is giving me troubles. It actually use to work just fine under a previous version of Qt4 (don't remember which). the code for the

问题 I have a PYTHON CGI script(Content-type: text/plain ) which takes about 10 minutes to execute. I want to see the execution status of my script on my browser . Like below: Part 1 of script executed... Part 2 of script executed.. Part 3 of script executed.. Execution Complete I am using print statements, but it is outputting all the print statements all-together only after the script has completed execution, and not one by one. Please help .. 回答1: Try doing: import sys ... print "Part 1 of