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Validate uniqueness of multiple columns
Is there a rails-way way to validate that an actual record is unique and not just a column? For example, a friendship model / table should not be able to have multiple identical records like:
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“Cross origin requests are only supported for HTTP.” error when loading a local file
I'm trying to load a 3D model into Three.js with JSONLoader , and that 3D model is in the same directory as the entire website.
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How do I copy an object in Java?
... to copy the object, but don't use it. It's way too easy to create a class and do improper clone method. If you are going to do that, read at least what Joshua Bloch has to say about it in Effective Java.
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Toggle input disabled attribute using jQuery
...lse).
So in this case, I used a function that supplied me the index (i) and the current value (v), then I returned the opposite of the current value, so the property state is reversed.
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JSONDecodeError: Expecting value: line 1 column 1 (char 0)
... response from UTF8 to unicode, the simplejson / json .loads() method can handle UTF8 encoded data natively.
pycurl has a very archaic API. Unless you have a specific requirement for using it, there are better choices.
requests offers the most friendly API, including JSON support. If you can, repl...
Android - Center TextView Horizontally in LinearLayout
...rLayout it is already in the horizontal center of the layout. When you use android:layout_gravity it places the widget, as a whole, in the gravity specified. Instead of placing the whole widget center what you're really trying to do is place the content in the center which can be accomplished with a...
How to completely uninstall Android Studio on Mac?
I recently downloaded Android Studio on my Macbook Pro and I messed up with it every time I open it. It gives me plugin errors and several other errors. I need to uninstall it completely from my mac. I tried to delete it from my mac and then install it again as if you would do the first time, but it...
Origin is not allowed by Access-Control-Allow-Origin
...rticle on this issue a while back, Cross Domain AJAX.
The easiest way to handle this if you have control of the responding server is to add a response header for:
Access-Control-Allow-Origin: *
This will allow cross-domain Ajax. In PHP, you'll want to modify the response like so:
<?php heade...
Convert integer to binary in C#
...ger expressed as a string. Let's say your integer was actually an integer, and you want to take the integer and convert it to a binary string.
int value = 8;
string binary = Convert.ToString(value, 2);
Which returns 1000.
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jQuery: fire click() before blur() event
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Solution 1
Listen to mousedown instead of click.
The mousedown and blur events occur one after another when you press the mouse button, but click only occurs when you release it.
Solution 2
You can preventDefault() in mousedown to block the dropdown from stealing focus. The slight adva...