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Can every recursion be converted into iteration?
...e a programming system so advanced as to treat a recursive definition of a formula as an invitation to memoize prior results, thus offering the speed benefit without the hassle of telling the computer exactly which steps to follow in the computation of a formula with a recursive definition. Dijkstra...
How to check if a String is numeric in Java
...
try {
Double.parseDouble(str);
return true;
} catch(NumberFormatException e){
return false;
}
}
However, if you're calling this function a lot, and you expect many of the checks to fail due to not being a number then performance of this mechanism will not be great, sin...
What is the difference between Xamarin.Form's LayoutOptions, especially Fill and Expand?
In Xamarin.Forms every View has the two properties HorizontalOptions and VerticalOptions . Both are of type LayoutOptions and can have one of the following values:
...
Placeholder in IE9
...lso it doesn't submit the placeholder text as a value when you submit your form (... a real pain I found with other plugins).
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Do checkbox inputs only post data if they're checked?
... browsers to only send the checkbox input value data if it is checked upon form submission?
12 Answers
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jQuery AJAX file upload PHP
...loads directory. The jQuery ajax method (running in the browser) sends the form data to the server, then a script on the server handles the upload. Here's an example using PHP.
Your HTML is fine, but update your JS jQuery script to look like this:
$('#upload').on('click', function() {
var file...
Get raw POST body in Python Flask regardless of Content-Type header
...r explained that request.data is the raw post body, but will be empty if form data is parsed. How can I get the raw post body unconditionally?
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Implementing MVC with Windows Forms
...d a good example on how to completely implement the MVC pattern in Windows Forms?
6 Answers
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How to get body of a POST in php?
...late_raw_post_data. php://input is not available with
enctype="multipart/form-data".
Specifically you'll want to note that the php://input stream, regardless of how you access it in a web SAPI, is not seekable. This means that it can only be read once. If you're working in an environment where l...
Django Admin - Disable the 'Add' action for a specific model
I have a django site with lots of models and forms. I have many custom forms and formsets and inlineformsets and custom validation and custom querysets. Hence the add model action depends on forms that need other things, and the 'add model' in the django admin throughs a 500 from a custom queryset.
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