Why does a virtual function get hidden?

Assuming you intended B to derive from A: f(int) and f() are different signatures, hence different functions. You can override a virtual function with a function that has a compatible signature, which means either an identical signature, or one in which the return type is “more specific” (this is covariance). Otherwise, your derived class function … Read more

How can I hide/show a div when a button is clicked?

Use JQuery. You need to set-up a click event on your button which will toggle the visibility of your wizard div. $(‘#btn’).click(function() { $(‘#wizard’).toggle(); }); Refer to the JQuery website for more information. This can also be done without JQuery. Using only standard JavaScript: <script type=”text/javascript”> function toggle_visibility(id) { var e = document.getElementById(id); if(e.style.display == … Read more

What exactly does Android’s @hide annotation do?

What exactly does this do? It controls what is in the android.jar that you are compiling against. When you have, say, compileSdkVersion 19 in your build.gradle file, what is really happening is that $ANDROID_SDK/platforms/android-19/android.jar is being added to your compile-time classpath. That JAR is created as part of compiling Android itself. The Android framework classes … Read more

Select2: Hide certain options dynamically

Would adding the following CSS Rule to the page solve your problem? .select2-container–default .select2-results__option[aria-disabled=true] { display: none; } Basically it would hide a disable option instead of displaying it with a gray background. Use disabled instead of display:’none’ in your options list also. JS Bin

jQuery show for 5 seconds then hide

You can use .delay() before an animation, like this: $(“#myElem”).show().delay(5000).fadeOut(); If it’s not an animation, use setTimeout() directly, like this: $(“#myElem”).show(); setTimeout(function() { $(“#myElem”).hide(); }, 5000); You do the second because .hide() wouldn’t normally be on the animation (fx) queue without a duration, it’s just an instant effect. Or, another option is to use .delay() … Read more

Show welcome div only once per user / browser session

Set a cookie. $(document).ready(function() { if ($.cookie(‘noShowWelcome’)) $(‘.welcome’).hide(); else { $(“#close-welcome”).click(function() { $(“.welcome”).fadeOut(1000); $.cookie(‘noShowWelcome’, true); }); } }); You need to include jQuery.cookie javascript file. https://raw.githubusercontent.com/carhartl/jquery-cookie/master/src/jquery.cookie.js