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How to check if a map contains a key in Go?
...s that 0 because it's not in the map
at all? You can discriminate with a form of multiple assignment.
var seconds int
var ok bool
seconds, ok = timeZone[tz]
For obvious reasons this is called the “comma ok” idiom. In this
example, if tz is present, seconds will be set appropriately an...
How Drupal works? [closed]
... that page needs to be built...") Content only gets saved because Drupal's FormAPI is responsible for building a page, and fires the 'a form was submitted' event for a module to respond to. Hourly maintenance happens because hook_cron() is triggered, and any module with mymodulename_cron() as a func...
Binary Data in JSON String. Something better than Base64
The JSON format natively doesn't support binary data. The binary data has to be escaped so that it can be placed into a string element (i.e. zero or more Unicode chars in double quotes using backslash escapes) in JSON.
...
How can I select an element by name with jQuery?
...input field using name element in jQuery by:
var firstname = jQuery("#form1 input[name=firstname]").val(); //Returns ABCD
var lastname = jQuery("#form1 input[name=lastname]").val(); //Returns XYZ
console.log(firstname);
console.log(lastname);
<script src="https://ajax.googleapis.com/aja...
how to reset
...
You need to wrap <input type = “file”> in to <form> tags and then you can reset input by resetting your form:
onClick="this.form.reset()"
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What is the correct way to create a single-instance WPF application?
Using C# and WPF under .NET (rather than Windows Forms or console), what is the correct way to create an application that can only be run as a single instance?
...
What's the best way to store Phone number in Django models
...
You might actually look into the internationally standardized format E.164, recommended by Twilio for example (who have a service and an API for sending SMS or phone-calls via REST requests).
This is likely to be the most universal way to store phone numbers, in particular if you have...
How can I change or remove HTML5 form validation default error messages?
... numbers are required and length of value must be 10. When I try to submit form with value which length is 5, the default error message appears: Please match the requested format
...
Where is C not a subset of C++? [closed]
... a couple of things
No tentative definitions in C++
int n;
int n; // ill-formed: n already defined
int[] and int[N] not compatible (no compatible types in C++)
int a[1];
int (*ap)[] = &a; // ill-formed: a does not have type int[]
No K&R function definition style
int b(a) int a; { } /...
Set custom HTML5 required field validation message
I have one form with many input fields. I have put html5 validations
11 Answers
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