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Bootstrap Carousel image doesn't align properly

...sive center-block" src="img/....jpg" alt="First slide"> This automatically does image resizing, and centers the picture. Edit: With bootstrap 4, just add the img-fluid class <img class="img-fluid" src="img/....jpg"> ...
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HTML5 form required attribute. Set custom validation message?

...ustomValidity works slightly differently to what I understood when I originally answered. If setCustomValidity is set to anything other than the empty string it will cause the field to be considered invalid; therefore you must clear it before testing validity, you can't just set it and forget. Furt...
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How to grey out a button?

... disabled by setting the alpha (making it semi-transparent). This is especially useful if your button background is an image, and you don't want to create states for it. button.setAlpha(.5f); button.setClickable(false); update: I wrote the above solution pre Kotlin and when I was a rookie. It's m...
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Is it possible to deserialize XML into List?

... You can encapsulate the list trivially: using System; using System.Collections.Generic; using System.Xml.Serialization; [XmlRoot("user_list")] public class UserList { public UserList() {Items = new List<User>();} [XmlElement("user")] publi...
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How do I use a Boolean in Python?

Does Python actually contain a Boolean value? I know that you can do: 7 Answers 7 ...
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Change the maximum upload file size

I have a website hosted on a PC I have no access to. I have an upload form allowing people to upload mp3 files up to 30MB big. My server side script is done in PHP. ...
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jquery .html() vs .append()

...y's methods, this is what happens: A temporary element is created, let's call it x. x's innerHTML is set to the string of HTML that you've passed. Then jQuery will transfer each of the produced nodes (that is, x's childNodes) over to a newly created document fragment, which it will then cache for n...
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PHP Function with Optional Parameters

...wered Oct 20 '10 at 14:32 Matt BallMatt Ball 323k8585 gold badges599599 silver badges672672 bronze badges ...
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sed or awk: delete n lines following a pattern

... how to delete all lines after the pattern is matched ? I am using sed -e '/<!--#content end--></div>/,$d' out.txt but it gives error saying : sed: -e expression #1, char 24: extra characters after command Thanks in advance. ...
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Can I have onScrollListener for a ScrollView?

... Every instance of View calls getViewTreeObserver(). Now when holding an instance of ViewTreeObserver, you can add an OnScrollChangedListener() to it using the method addOnScrollChangedListener(). You can see more information about this class here. ...