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jQuery disable/enable submit button
...oved away from the input (e.g. someone clicks off the input or tabs out of it). Try using keyup instead:
$(document).ready(function() {
$(':input[type="submit"]').prop('disabled', true);
$('input[type="text"]').keyup(function() {
if($(this).val() != '') {
$(':input[typ...
Use of alloc init instead of new
...a bunch of reasons here: http://macresearch.org/difference-between-alloc-init-and-new
Some selected ones are:
new doesn't support custom initializers (like initWithString)
alloc-init is more explicit than new
General opinion seems to be that you should use whatever you're comfortable with.
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Populating a database in a Laravel migration file
...follow
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edited Oct 4 '12 at 21:31
answered Oct 4 '12 at 21:25
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Copy a variable's value into another
I have a variable which has a JSON object as its value. I directly assign this variable to some other variable so that they share the same value. This is how it works:
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Overriding superclass property with different type in Swift
...n Swift, can someone explain how to override a property on a superclass's with another object subclassed from the original property?
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How to deal with page breaks when printing a large HTML table
I have a project which requires printing an HTML table with many rows.
12 Answers
12
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Signed to unsigned conversion in C - is it always safe?
...ll be converted to an unsigned integer by adding UINT_MAX + 1, then the addition will be carried out with the unsigned values, resulting in a large result (depending on the values of u and i).
Long Answer
According to the C99 Standard:
6.3.1.8 Usual arithmetic conversions
If both opera...
parseInt(null, 24) === 23… wait, what?
Alright, so I was messing around with parseInt to see how it handles values not yet initialized and I stumbled upon this gem. The below happens for any radix 24 or above.
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Styling an input type=“file” button
...toriously difficult, as most browsers will not change the appearance from either CSS or javascript.
Even the size of the input will not respond to the likes of:
<input type="file" style="width:200px">
Instead, you will need to use the size attribute:
<input type="file" size="60" />
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How to list the properties of a JavaScript object?
...eys.push(key);
}
return keys;
}
Alternatively replace var getKeys with Object.prototype.keys to allow you to call .keys() on any object. Extending the prototype has some side effects and I wouldn't recommend doing it.
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