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How to allow to accept only image files?

...t is very sketchy on mobiles (as of 2015) and by some reports this may actually prevent some mobile browsers from uploading anything at all, so be sure to test your target platforms well. For detailed browser support, see http://caniuse.com/#feat=input-file-accept ...
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Opening Android Settings programmatically

How can I open settings programmatically? 11 Answers 11 ...
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Serializing PHP object to JSON

...ata->getJsonData());. In essence, implement the function from 5.4, but call it by hand. Something like this would work, as get_object_vars() is called from inside the class, having access to private/protected variables: function getJsonData(){ $var = get_object_vars($this); foreach ($va...
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Eclipse - no Java (JRE) / (JDK) … no virtual machine

... (the first one referenced by your PATH) Three things to remember: "Installing" a JRE or a JDK can be as simple as unzipping or copying it from another computer: there is no special installation steps, and you can have as many different JVM versions (1.4, 5.0, 6.0...) as you want, "installed" (co...
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How to change legend title in ggplot

...ould work: p <- ggplot(df, aes(x=rating, fill=cond)) + geom_density(alpha=.3) + xlab("NEW RATING TITLE") + ylab("NEW DENSITY TITLE") p <- p + guides(fill=guide_legend(title="New Legend Title")) (or alternatively) p + scale_fill_discrete(name = "New Legen...
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ASP.NET MVC Razor Concatenation

... You should wrap the inner part of the call with ( ): <li id="item_@(item.TheItemId)"> share | improve this answer | follow | ...
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TransactionManagementError “You can't execute queries until the end of the 'atomic' block” while usi

...ementError when trying to save a Django User model instance and in its post_save signal, I'm saving some models that have the user as the foreign key. ...
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How to write a cron that will run a script every day at midnight?

...2 wd day of week 0-7 (Sunday = 0 or 7) command: what you want to run all numeric values can be replaced by * which means all share | improve this answer | follow ...
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check if jquery has been loaded, then load it if false

... I believe appending a script tag to body works in all browsers. – Steven Lu Jan 6 '13 at 21:26 3 ...
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Auto Resize Image in CSS FlexBox Layout and keeping Aspect Ratio?

... it also possible to do this for the height dimension if the screen gets smaller? – confile Jan 14 '14 at 0:43 @confil...