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Math - mapping numbers
...ply by the ratio and add the starting value of your second range. In other words,
R = (20 - 10) / (6 - 2)
y = (x - 2) * R + 10
This evenly spreads the numbers from the first range in the second range.
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How to select option in drop down using Capybara
...ect, from, options).find(:option, value, options).select_option
In other words, it finds the <select> you're interested in, then finds the <option> within that, then calls select_option on the <option> node.
You've already pretty much done the first two things, I'd just rearrang...
How do I create a dynamic key to be added to a JavaScript object variable [duplicate]
...e case the object involved happens to be an array is unimportant, in other words.
When setting property values using [ ], the story is the same except for the special behavior around maintaining the length property. If you set a property with a numeric key on an array instance:
myArray[200] = 5;
th...
How does JavaScript .prototype work?
...n the default object returned from a constructor function),
The extends keyword (configures the prototype chain when using the class syntax),
Object.create will set the supplied argument as the [[Prototype]] of the resulting object,
Object.getPrototypeOf and Object.setPrototypeOf (get/set the [[Prot...
Remove Primary Key in MySQL
...ed your direct question. Just a side note: Maybe this is just some awkward wording on your part, but you seem to be under the impression that you have three primary keys, one on each field. This is not the case. By definition, you can only have one primary key. What you have here is a primary key th...
What is the equivalent to a JavaScript setInterval/setTimeout in Android/Java?
...andlers or Timers makes an Android phone wake up from sleep mode. In other words, if you want to schedule something to actually happen even though the screen is off / cpu is sleeping, you need to check out the AlarmManager too.
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MVC 4 Razor File Upload
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In other words - Your view model property name must match that of the input type name. If your viewmodel property is named AgentPhoto then you must have the following on your view: <input type="file" name="AgentPhoto"/>
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Chrome: Uncaught SyntaxError: Unexpected end of input
...rying to parse an empty JSON:
JSON.parse(stringifiedJSON);
In other words, what happened was the following:
JSON.parse("");
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“Unsafe JavaScript attempt to access frame with URL…” error being continuously generated in Chrome w
...k, you don't have a trailing forward slash in the Site URL field. In other words, you need "http://domain.com/" not "http://domain.com"
You can check the Site URL setting from developers.facebook.com/apps Edit settings -> Basic -> Site URL.
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What does PHP keyword 'var' do?
... "Note: The PHP 4 method of declaring a variable with the var keyword is still supported for compatibility reasons (as a synonym for the public keyword). In PHP 5 before 5.1.3, its usage would generate an E_STRICT warning." php.net/manual/en/language.oop5.visibility.php EDIT: I just saw th...