FormData.has()
The has()
method of the FormData
interface returns a boolean stating whether a FormData
object contains a certain key.
Note: This method is available in Web Workers.
Syntax
formData.has(name);
Parameters
name
-
A
USVString
representing the name of the key you want to test for.
Returns
A boolean value.
Example
The following line creates an empty FormData
object:
var formData = new FormData();
The following snippet shows the results of testing for the existence of username
in the FormData
object, before and after appending a username
value to it with FormData.append
:
formData.has('username'); // Returns false
formData.append('username', 'Chris');
formData.has('username'); // Returns true
Specifications
Specification |
---|
XMLHttpRequest Standard # dom-formdata-has |
Browser compatibility
BCD tables only load in the browser