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83 lines
5.3 KiB
Markdown
83 lines
5.3 KiB
Markdown
## Mobile JSON Wire Protocol Errors
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This package exports a number of classes and methods related to Selenium error handling. There are error classes for each Selenium error type (see [here](https://code.google.com/p/selenium/wiki/JsonWireProtocol#Response_Status_Codes), as well as the context errors in the [mobile spec](https://github.com/SeleniumHQ/mobile-spec/blob/master/spec-draft.md#webviews-and-other-contexts)).
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These classes, which are constructed with a string message (defaulting to the "Details" below), are available through the `errors` object exported by the module. They are
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Code | Class Name | Details
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-----|----------------------------------|-----------------------------------------------
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| `MJSONWPError`<sup>1</sup> | Base class for other errors
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6 | `NoSuchDriverError` | A session is either terminated or not started
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7 | `NoSuchElementError` | An element could not be located on the page using the given search parameters
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8 | `NoSuchFrameError` | A request to switch to a frame could not be satisfied because the frame could not be found
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9 | `UnknownCommandError` | The requested resource could not be found, or a request was received using an HTTP method that is not supported by the mapped resource
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10 | `StaleElementReferenceError` | An element command failed because the referenced element is no longer attached to the DOM
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11 | `ElementNotVisibleError` | An element command could not be completed because the element is not visible on the page
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12 | `InvalidElementStateError` | An element command could not be completed because the element is in an invalid state (e.g., attempting to click a disabled element)
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13 | `UnknownError` | An unknown server-side error occurred while processing the command
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13 | `NotYetImplementedError` | The operation requested is not yet implemented by the driver
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13 | `NotImplementedError` | The operation requested will not be implemented by the driver
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15 | `ElementIsNotSelectableError` | An attempt was made to select an element that cannot be selected
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17 | `JavaScriptError` | An error occurred while executing user supplied JavaScript
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19 | `XPathLookupError` | An error occurred while searching for an element by XPath
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21 | `TimeoutError` | An operation did not complete before its timeout expired
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23 | `NoSuchWindowError` | A request to switch to a different window could not be satisfied because the window could not be found
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24 | `InvalidCookieDomainError` | An illegal attempt was made to set a cookie under a different domain than the current page
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25 | `UnableToSetCookieError` | A request to set a cookie's value could not be satisfied
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26 | `UnexpectedAlertOpenError` | A modal dialog was open, blocking this operation
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27 | `NoAlertOpenError` | An attempt was made to operate on a modal dialog when one was not open
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28 | `ScriptTimeoutError` | A script did not complete before its timeout expired
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29 | `InvalidElementCoordinatesError` | The coordinates provided to an interactions operation are invalid
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30 | `IMENotAvailableError` | Input Method Editor was not available
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31 | `IMEEngineActivationFailedError` | An Input Method Editor engine could not be started
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32 | `InvalidSelectorError` | Argument was an invalid selector (e.g., XPath/CSS)
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33 | `SessionNotCreatedError` | A new session could not be created
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34 | `MoveTargetOutOfBoundsError` | Target provided for a move action is out of bounds
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35 | `NoSuchContextError` | Context provided (e.g., `WEBVIEW_42`) does not exist
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36 | `InvalidContextError` | The operation could not be performed in the current context
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| `BadParametersError`<sup>2</sup> | The parameters specified for the operation are incorrect
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<sup>1</sup> `MJSONWPError` is the base class for all errors that are part of the Selenium specification (i.e., all errors except `BadParametersError`), and not itself part of that specification.
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<sup>2</sup> `BadParametersError` is not part of the Selenium specification, but deals with request management.
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There are, in addition, two helper methods for dealing with errors
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`isErrorType (err, type)`
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- checks if the `err` object is a Mobile JSON Wire Protocol error of a particular type
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- arguments
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- `err` - the error object to test
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- `type` - the error class to test against
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- usage
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```js
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import { errors, isErrorType } from 'appium-base-driver';
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try {
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// do some stuff...
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} catch (err) {
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if (isErrorType(err, errors.InvalidCookieDomainError)) {
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// process...
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}
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}
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```
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`errorFromCode (code, message)`
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- retrieve the appropriate error for an error code, with the supplied message.
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- arguments
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- `code` - the integer error code for a Mobile JSON Wire Protocol error
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- `message` - the message to be encapsulated in the error
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- usage
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```js
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import { errors, errorFromCode } from 'appium-base-driver';
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let error = errorFromCode(6, 'an error has occurred');
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console.log(error instanceof errors.NoSuchDriverError);
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// => true
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console.log(error.message === 'an error has occurred');
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// => true
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```
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