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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
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | 50.0 | 44 (44) | ? | (Yes) | ? |
Available in web workers | 50.0 | 44 (44) | ? | (Yes) | ? |
Feature | Android | Android Webview | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
---|---|---|---|---|---|---|---|
Basic support | No support | 50.0 | 44.0 (44) | ? | ? | ? | 50.0 |
Available in web workers | No support | 50.0 | 44.0 (44) | ? | ? | ? | 50.0 |