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How can I tell if a DOM element is visible in the current viewport?
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TODO: this method does not handle two situations:
overlapping using z-index
using overflow-scroll in element's container
try something new - The Intersection Observer API explained
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imp...
Posting a File and Associated Data to a RESTful WebService preferably as JSON
...as JSON. Part of this application requires the client to upload a file (usually an image) as well as information about the image.
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How to Animate Addition or Removal of Android ListView Rows
...e_out_right
);
anim.setDuration(500);
listView.getChildAt(index).startAnimation(anim );
new Handler().postDelayed(new Runnable() {
public void run() {
FavouritesManager.getInstance().remove(
FavouritesManager.getInstance().getTripManagerAtIndex(index)
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postgresql COUNT(DISTINCT …) very slow
...UNT(DISTINCT()) performs sorting, it will be definitely helpful to have an index on the column_name especially with relatively small amount of work_mem (where hashing will produce relatevely large amount of batches). Since that, it's not always bad to use COUNT (DISTINCT()_, isn't?
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What is the AppDelegate for and how do I know when to use it?
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I normally avoid the design approach implied by Andrew's use of the term "heart of your application". What I mean by this is that I think you should avoid lumping too many things in a central location -- good program design normall...
Django URL Redirect
...directView.as_view(url='<url_to_home_view>', permanent=False), name='index')
)
Notice how as url in the <url_to_home_view> you need to actually specify the url.
permanent=False will return HTTP 302, while permanent=True will return HTTP 301.
Alternatively you can use django.shortcuts...
CSS Selector “(A or B) and C”?
... syntax?
No. CSS' or operator (,) does not permit groupings. It's essentially the lowest-precedence logical operator in selectors, so you must use .a.c,.b.c.
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Factors in R: more than an annoyance?
...es and hate apples but don't mind grapes I don't need to manage some weird index to say so:
d <- data.frame(x = rnorm(20), f = sample(c("apples", "oranges", "grapes"), 20, replace = TRUE, prob = c(0.5, 0.25, 0.25)))
d$f <- ordered(d$f, c("apples", "grapes", "oranges"))
d[d$f >= "grapes", ...
Insert new column into table in sqlite?
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don't forget to re-create indexes
– Jan Turoň
Apr 6 '14 at 23:20
5
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How to dynamically insert a tag via jQuery after page load?
...ve, do the following:
$.ajax({
url: "path/to/return/the-above-js+html.php",
success: function(newhtml){
newhtml += "<";
newhtml += "/script>";
$("head").append(newhtml);
}
});
Just don't ask me why :-) This is one of those things I've come to as a result ...