The FormData.keys()
method returns an iterator
allowing to go through all keys contained in this object. The keys are USVString
objects.
Note: This method is available in Web Workers.
Syntax
formData.keys();
Return value
Returns an iterator
.
Example
// Create a test FormData object var formData = new FormData(); formData.append('key1', 'value1'); formData.append('key2', 'value2'); // Display the keys for (var key of formData.keys()) { console.log(key); }
The result is:
key1 key2
Specifications
Specification | Status | Comment |
---|---|---|
XMLHttpRequest The definition of 'keys() (as iterator<>)' in that specification. |
Living Standard | Initial definition |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
keys | Chrome Full support 50 | Edge Full support 18 | Firefox Full support 44 | IE ? | Opera Full support Yes | Safari Full support 11 | WebView Android Full support 50 | Chrome Android Full support 50 | Firefox Android Full support 44 | Opera Android ? | Safari iOS Full support 11 | Samsung Internet Android Full support 5.0 |
Legend
- Full support
- Full support
- Compatibility unknown
- Compatibility unknown