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Returning JSON from PHP to JavaScript?

I have a PHP script that's being called through jQuery AJAX. I want the PHP script to return the data in JSON format to the javascript. Here's the pseudo code in the PHP script: ...
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Using Sinatra for larger projects via multiple files

It seems that in Sinatra all route handlers are being written into a single file, if I understand right it acts as a one large/small controller. Is there any way to split it into separate independent files, so when let's say somebody calls "/" - one action is executed, and if smth like "/posts/2" is...
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Possible to make labels appear when hovering over a point in matplotlib?

I am using matplotlib to make scatter plots. Each point on the scatter plot is associated with a named object. I would like to be able to see the name of an object when I hover my cursor over the point on the scatter plot associated with that object. In particular, it would be nice to be able to qui...
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Can you get DB username, pw, database name in Rails?

I'm writing a rake task that does some DB work outside of Rails/ActiveRecord. 5 Answers ...
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How can I get the sha1 hash of a string in node.js?

I'm trying to create a websocket server written in node.js 5 Answers 5 ...
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Maven command to list lifecycle phases along with bound goals?

I'm just learning Maven, and so this might be obvious, but I can't find an easy way to list the goals associated for each maven lifecycle phase for a given project. ...
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Writing a compiler in its own language

...tuitively, it would seems that a compiler for language Foo cannot itself be written in Foo. More specifically, the first compiler for language Foo cannot be written in Foo, but any subsequent compiler could be written for Foo . ...
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Replace a value if null or undefined in JavaScript

...|| 10; //j is now 10 Note that the logical operator || does not return a boolean value but the first value that can be converted to true. Additionally use an array of objects instead of one single object: var options = { filters: [ { name: 'firstName', value: ...
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How can I convert immutable.Map to mutable.Map in Scala?

How can I convert immutable.Map to mutable.Map in Scala so I can update the values in Map ? 5 Answers ...
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HTML5 dragleave fired when hovering a child element

The problem I'm having is that the dragleave event of an element is fired when hovering a child element of that element. Also, dragenter is not fired when hovering back the parent element again. ...