Qt 5.11 | Qt WebEngine | C++ Classes | QWebEngineScript

Qt 5.11.3 Reference Documentation

# QWebEngineScript Class

The QWebEngineScript class encapsulates a JavaScript program. More...

Header: | #include <QWebEngineScript>
qmake: | QT += webenginewidgets
Since: | Qt 5.5

- List of all members, including inherited members

## Public Types

enum | InjectionPoint { DocumentCreation, DocumentReady, Deferred }
enum | ScriptWorldId { MainWorld, ApplicationWorld, UserWorld }

## Public Functions

| QWebEngineScript()
| QWebEngineScript(const QWebEngineScript &other)
| ~QWebEngineScript()
QWebEngineScript::InjectionPoint | injectionPoint() const
bool | isNull() const
QString | name() const
bool | runsOnSubFrames() const
void | setInjectionPoint(QWebEngineScript::InjectionPoint p)
void | setName(const QString &scriptName)
void | setRunsOnSubFrames(bool on)
void | setSourceCode(const QString &scriptSource)
void | setWorldId(quint32 id)
QString | sourceCode() const
void | swap(QWebEngineScript &other)
quint32 | worldId() const
bool | operator!=(const QWebEngineScript &other) const
QWebEngineScript & | operator=(const QWebEngineScript &other)
bool | operator==(const QWebEngineScript &other) const

## Detailed Description

The QWebEngineScript class encapsulates a JavaScript program.

QWebEngineScript enables the programmatic injection of so called user scripts in the JavaScript engine at different points, determined by injectionPoint(), during the loading of web contents.

Scripts can be executed either in the main JavaScript world, along with the rest of the JavaScript coming from the web contents, or in their own isolated world. While the DOM of the page can be accessed from any world, JavaScript variables of a function defined in one world are not accessible from a different one. ScriptWorldId provides some predefined IDs for this purpose.

The following Greasemonkey attributes are supported since Qt 5.8: `@exclude`, `@include`, `@name`, `@match`, and `@run-at`.

Use QWebEnginePage::scripts() and QWebEngineProfile::scripts() to access the collection of scripts associated with a single page or a number of pages sharing the same profile.

## Member Type Documentation

### enum QWebEngineScript::InjectionPoint

This enum describes the timing of the script injection:

Constant | Value | Description
--- | --- | ---
`QWebEngineScript::DocumentCreation` | `2` | The script will be executed as soon as the document is created. This is not suitable for any DOM operation.
`QWebEngineScript::DocumentReady` | `1` | The script will run as soon as the DOM is ready. This is equivalent to the `DOMContentLoaded` event firing in JavaScript.
`QWebEngineScript::Deferred` | `0` | The script will run when the page load finishes, or 500ms after the document is ready, whichever comes first.

### enum QWebEngineScript::ScriptWorldId

This enum provides pre-defined world IDs for isolating user scripts into different worlds:

Constant | Value | Description
--- | --- | ---
`QWebEngineScript::MainWorld` | `0` | The world used by the page's web contents. It can be useful in order to expose custom functionality to web contents in certain scenarios.
`QWebEngineScript::ApplicationWorld` | `1` | The default isolated world used for application level functionality implemented in JavaScript.
`QWebEngineScript::UserWorld` | `2` | The first isolated world to be used by scripts set by users if the application is not making use of more worlds. As a rule of thumb, if that functionality is exposed to the application users, each individual script should probably get its own isolated world.

## Member Function Documentation

### QWebEngineScript::QWebEngineScript()

Constructs a null script.

### QWebEngineScript::QWebEngineScript(const QWebEngineScript &other)

Constructs a user script using the contents of other.

### QWebEngineScript::~QWebEngineScript()

Destroys a script.

### QWebEngineScript::InjectionPoint QWebEngineScript::injectionPoint() const

Returns the point in the loading process at which the script will be executed. The default value is QWebEngineScript::Deferred.

See also setInjectionPoint().

### bool QWebEngineScript::isNull() const

Returns `true` is the script is null; otherwise returns `false`.

### QString QWebEngineScript::name() const

Returns the name of the script. Can be useful to retrieve a particular script from a QWebEngineScriptCollection.

See also setName(), QWebEngineScriptCollection::findScript(), and QWebEngineScriptCollection::findScripts().

### bool QWebEngineScript::runsOnSubFrames() const

Returns `true` if the script is executed on every frame in the page, or `false` if it is only ran for the main frame.

See also setRunsOnSubFrames().

### void QWebEngineScript::setInjectionPoint(QWebEngineScript::InjectionPoint p)

Sets the point at which to execute the script to be p.

See also injectionPoint() and InjectionPoint.

### void QWebEngineScript::setName(const QString &scriptName)

Sets the script name to scriptName.

See also name().

### void QWebEngineScript::setRunsOnSubFrames(bool on)

Executes the script on sub frames in addition to the main frame if on returns `true`.

See also runsOnSubFrames().

### void QWebEngineScript::setSourceCode(const QString &scriptSource)

Sets the script source to scriptSource.

See also sourceCode().

### void QWebEngineScript::setWorldId(quint32 id)

Sets the world ID of the isolated world to id when running this script.

Must be between `0` and `256`.

See also worldId().

### QString QWebEngineScript::sourceCode() const

Returns the source of the script.

See also setSourceCode().

### void QWebEngineScript::swap(QWebEngineScript &other)

Swaps the contents of the script with the contents of other.

### quint32 QWebEngineScript::worldId() const

Returns the world ID defining which world the script is executed in.

See also setWorldId().

### bool QWebEngineScript::operator!=(const QWebEngineScript &other) const

Returns `true` if the script is not equal to other, otherwise returns `false`.

### QWebEngineScript &QWebEngineScript::operator=(const QWebEngineScript &other)

Assigns other to the script.

### bool QWebEngineScript::operator==(const QWebEngineScript &other) const

Returns `true` if the script is equal to other, otherwise returns `false`.