FormData: has() method
Note: This feature is available in Web Workers.
The has()
method of the FormData
interface returns whether a FormData
object contains a certain key.
Syntax
js
has(name)
Parameters
name
-
A string representing the name of the key you want to test for.
Return value
true
if a key of FormData
matches the specified name
. Otherwise, false
.
Examples
The following snippet shows the results of testing for the existence of username
in a FormData
object, before and after appending a username
value to it with append()
:
js
formData.has("username"); // Returns false
formData.append("username", "Chris");
formData.has("username"); // Returns true
Specifications
Specification |
---|
XMLHttpRequest Standard # dom-formdata-has |
Browser compatibility
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