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 # dom-formdata-has |