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jquery .html() vs .append()

... depends heavily on the situation. If you want to create a large number of identical elements, then the last thing you want to do is create a massive loop, creating a new jQuery object on every iteration. E.g. the quickest way to create 100 divs with jQuery: jQuery(Array(101).join('<div></...
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What is href=“#” and why is it used?

...location. Hash: A hash - # within a hyperlink specifies an html element id to which the window should be scrolled. href="#some-id" would scroll to an element on the current page such as <div id="some-id">. href="//site.com/#some-id" would go to site.com and scroll to the id on that page...
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Reference alias (calculated in SELECT) in WHERE clause

...sion is extremely complex (or costly to calculate) you should probably consider a computed column (and perhaps persisted) instead, especially if a lot of queries refer to this same expression. PS your fears seem unfounded. In this simple example at least, SQL Server is smart enough to only perform ...
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What are the details of “Objective-C Literals” mentioned in the Xcode 4.4 release notes?

...23.45; number = @YES; [Edit] zxoq at http://news.ycombinator.com/item?id=3672744 has added more interesting new subscripting. (Added with literals): arr[1] === [arr objectAtIndex:1] dict[@"key"] === [dict objectForKey:@"key"] [Edit 2] The new ObjC literals were discussed in multiple ...
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How to add custom method to Spring Data JPA

I am looking into Spring Data JPA. Consider the below example where I will get all the crud and finder functionality working by default and if I want to customize a finder then that can be also done easily in the interface itself. ...
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Set the selected index of a Dropdown using jQuery

...t selector is pretty slow. It will scan every DOM element looking for the ids. It will be less of a performance hit if you can assign a class to the element. $(".myselect") To answer your question though, there are a few ways to change the select elements value in jQuery // sets selected index...
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How do PHP sessions work? (not “how are they used?”)

...re usually stored in, say, /tmp/ on the server, and named sess_{session_id} . I have been looking at the contents and cannot figure out how they really work. ...
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When to use single quotes, double quotes, and backticks in MySQL

... Backticks are to be used for table and column identifiers, but are only necessary when the identifier is a MySQL reserved keyword, or when the identifier contains whitespace characters or characters beyond a limited set (see below) It is often recommended to avoid using ...
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Center a button in a Linear layout

... If you want to center an item in the middle of the screen don't use a LinearLayout as these are meant for displaying a number of items in a row. Use a RelativeLayout instead. So replace: android:layout_gravity="center_vertical|center_horizontal" for the re...
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Using -performSelector: vs. just calling the method

... background thread, and for calling back results to the main thread from said background thread. – PeyloW Sep 30 '09 at 8:36 2 ...