playwright/docs/src/navigations.md

506 lines
14 KiB
Markdown
Raw Normal View History

2021-01-01 15:17:27 -08:00
---
id: navigations
title: "Navigations"
---
Playwright can navigate to URLs and handle navigations caused by page interactions. This guide covers common scenarios
to wait for page navigations and loading to complete.
2021-01-01 15:17:27 -08:00
<!-- TOC -->
## Navigation lifecycle
Playwright splits the process of showing a new document in a page into **navigation** and **loading**.
2021-11-03 15:26:25 -07:00
**Navigation starts** by changing the page URL or by interacting with the page (e.g., clicking a link).
The navigation intent may be canceled, for example, on hitting an unresolved DNS address or transformed into a file download.
**Navigation is committed** when the response headers have been parsed and session history is updated. Only after the
navigation succeeds (is committed), the page starts **loading** the document.
**Loading** covers getting the remaining response body over the network, parsing, executing the scripts and firing load
events:
- [`method: Page.url`] is set to the new url
- document content is loaded over network and parsed
- [`event: Page.DOMContentLoaded`] event is fired
- page executes some scripts and loads resources like stylesheets and images
- [`event: Page.load`] event is fired
- page executes dynamically loaded scripts
- `networkidle` is fired when no new network requests are made for 500 ms
## Scenarios initiated by browser UI
Navigations can be initiated by changing the URL bar, reloading the page or going back or forward in session history.
### Auto-wait
Navigating to a URL auto-waits for the page to fire the `load` event. If the page does a client-side redirect before
`load`, [`method: Page.goto`] will auto-wait for the redirected page to fire the `load` event.
```js
// Navigate the page
await page.goto('https://example.com');
```
```java
// Navigate the page
page.navigate("https://example.com");
```
```python async
# Navigate the page
await page.goto("https://example.com")
```
```python sync
# Navigate the page
page.goto("https://example.com")
```
```csharp
// Navigate the page
await page.GotoAsync("https://example.com");
```
### Custom wait
Override the default behavior to wait until a specific event, like `networkidle`.
```js
// Navigate and wait until network is idle
await page.goto('https://example.com', { waitUntil: 'networkidle' });
```
```java
// Navigate and wait until network is idle
page.navigate("https://example.com", new Page.NavigateOptions()
.setWaitUntil(WaitUntilState.NETWORKIDLE));
```
```python async
# Navigate and wait until network is idle
await page.goto("https://example.com", wait_until="networkidle")
```
```python sync
# Navigate and wait until network is idle
page.goto("https://example.com", wait_until="networkidle")
```
```csharp
// Navigate and wait until network is idle
await page.GotoAsync("https://example.com", new PageGotoOptions { WaitUntil = WaitUntilState.NetworkIdle });
```
### Wait for element
In lazy-loaded pages, it can be useful to wait until an element is visible with [`method: Locator.waitFor`].
Alternatively, page interactions like [`method: Page.click`] auto-wait for elements.
```js
// Navigate and wait for element
await page.goto('https://example.com');
await page.locator('text=Example Domain').waitFor();
// Navigate and click element
// Click will auto-wait for the element
await page.goto('https://example.com');
await page.click('text=Example Domain');
```
```java
// Navigate and wait for element
page.navigate("https://example.com");
page.locator("text=Example Domain").waitFor();
// Navigate and click element
// Click will auto-wait for the element
page.navigate("https://example.com");
page.click("text=Example Domain");
```
```python async
# Navigate and wait for element
await page.goto("https://example.com")
await page.locator("text=example domain").wait_for()
# Navigate and click element
# Click will auto-wait for the element
await page.goto("https://example.com")
await page.click("text=example domain")
```
```python sync
# Navigate and wait for element
page.goto("https://example.com")
page.locator("text=example domain").wait_for()
# Navigate and click element
# Click will auto-wait for the element
page.goto("https://example.com")
page.click("text=example domain")
```
```csharp
// Navigate and wait for element
await page.GotoAsync("https://example.com");
await page.Locator("text=Example Domain").WaitForAsync();
// Navigate and click element
// Click will auto-wait for the element
await page.GotoAsync("https://example.com");
await page.ClickAsync("text=Example Domain");
```
### API reference
- [`method: Page.goto`]
- [`method: Page.reload`]
- [`method: Page.goBack`]
- [`method: Page.goForward`]
## Scenarios initiated by page interaction
In the scenarios below, [`method: Page.click`] initiates a navigation and then waits for the navigation to complete.
### Auto-wait
By default, [`method: Page.click`] will wait for the navigation step to complete. This can be combined with a page interaction on
the navigated page which would auto-wait for an element.
```js
// Click will auto-wait for navigation to complete
await page.click('text=Login');
// Fill will auto-wait for element on navigated page
await page.fill('#username', 'John Doe');
```
```java
// Click will auto-wait for navigation to complete
page.click("text=Login");
// Fill will auto-wait for element on navigated page
page.fill("#username", "John Doe");
```
```python async
# Click will auto-wait for navigation to complete
await page.click("text=Login")
# Fill will auto-wait for element on navigated page
await page.fill("#username", "John Doe")
```
```python sync
# Click will auto-wait for navigation to complete
page.click("text=Login")
# Fill will auto-wait for element on navigated page
page.fill("#username", "John Doe")
```
```csharp
// Click will auto-wait for navigation to complete
await page.ClickAsync("text=Login");
// Fill will auto-wait for element on navigated page
await page.FillAsync("#username", "John Doe");
```
### Custom wait
`page.click` can be combined with [`method: Page.waitForLoadState`] to wait for a loading event.
```js
await page.click('button'); // Click triggers navigation
await page.waitForLoadState('networkidle'); // This resolves after 'networkidle'
```
```java
page.click("button"); // Click triggers navigation
page.waitForLoadState(LoadState.NETWORKIDLE); // This resolves after "networkidle"
```
```python async
await page.click("button"); # Click triggers navigation
await page.wait_for_load_state("networkidle"); # This waits for the "networkidle"
```
```python sync
page.click("button"); # Click triggers navigation
page.wait_for_load_state("networkidle"); # This waits for the "networkidle"
```
```csharp
await page.ClickAsync("button"); // Click triggers navigation
await page.WaitForLoadStateAsync(LoadState.NetworkIdle); // This resolves after "networkidle"
```
### Wait for element
In lazy-loaded pages, it can be useful to wait until an element is visible with [`method: Locator.waitFor`].
Alternatively, page interactions like [`method: Page.click`] auto-wait for elements.
```js
// Click will auto-wait for the element and trigger navigation
await page.click('text=Login');
// Wait for the element
await page.locator('#username').waitFor();
// Click triggers navigation
await page.click('text=Login');
// Fill will auto-wait for element
await page.fill('#username', 'John Doe');
```
```java
// Click will auto-wait for the element and trigger navigation
page.click("text=Login");
// Wait for the element
page.locator("#username").waitFor();
// Click triggers navigation
page.click("text=Login");
// Fill will auto-wait for element
page.fill("#username", "John Doe");
```
```python async
# Click will auto-wait for the element and trigger navigation
await page.click("text=Login")
# Wait for the element
await page.locator("#username").wait_for()
# Click triggers navigation
await page.click("text=Login")
# Fill will auto-wait for element
await page.fill("#username", "John Doe")
```
```python sync
# Click triggers navigation
page.click("text=Login")
# Click will auto-wait for the element
page.locator("#username").wait_for()
# Click triggers navigation
page.click("text=Login")
# Fill will auto-wait for element
page.fill("#username", "John Doe")
```
```csharp
// Click will auto-wait for the element and trigger navigation
await page.ClickAsync("text=Login");
// Wait for the element
await page.Locator("#username").WaitForAsync();
// Click triggers navigation
await page.ClickAsync("text=Login");
// Fill will auto-wait for element
await page.FillAsync("#username", "John Doe");
```
### Asynchronous navigation
Clicking an element could trigger asynchronous processing before initiating the navigation. In these cases, it is
recommended to explicitly call [`method: Page.waitForNavigation`]. For example:
* Navigation is triggered from a `setTimeout`
* Page waits for network requests before navigation
```js
// Note that Promise.all prevents a race condition
// between clicking and waiting for a navigation.
await Promise.all([
// Waits for the next navigation.
// It is important to call waitForNavigation before click to set up waiting.
page.waitForNavigation(),
// Triggers a navigation after a timeout.
page.locator('div.delayed-navigation').clikc(),
]);
```
```java
// Using waitForNavigation with a callback prevents a race condition
// between clicking and waiting for a navigation.
page.waitForNavigation(() -> { // Waits for the next navigation
page.click("div.delayed-navigation"); // Triggers a navigation after a timeout
});
```
```python async
# Waits for the next navigation. Using Python context manager
# prevents a race condition between clicking and waiting for a navigation.
async with page.expect_navigation():
# Triggers a navigation after a timeout
await page.click("div.delayed-navigation")
```
```python sync
# Waits for the next navigation. Using Python context manager
# prevents a race condition between clicking and waiting for a navigation.
with page.expect_navigation():
# Triggers a navigation after a timeout
page.click("a")
```
```csharp
// Using waitForNavigation with a callback prevents a race condition
// between clicking and waiting for a navigation.
2021-05-26 15:50:42 -07:00
await page.RunAndWaitForNavigationAsync(async () =>
{
// Triggers a navigation after a timeout
await page.ClickAsync("div.delayed-navigation");
});
```
### Multiple navigations
Clicking an element could trigger multiple navigations. In these cases, it is recommended to explicitly
[`method: Page.waitForNavigation`] to a specific url. For example:
* Client-side redirects issued after the `load` event
* Multiple pushes to history state
```js
// Note that Promise.all prevents a race condition
// between clicking and waiting for a navigation.
await Promise.all([
// It is important to call waitForNavigation before click to set up waiting.
page.waitForNavigation({ url: '**/login' }),
// Triggers a navigation with a script redirect.
page.locator('text=Click me').click(),
]);
```
```java
// Running action in the callback of waitForNavigation prevents a race
// condition between clicking and waiting for a navigation.
page.waitForNavigation(new Page.WaitForNavigationOptions().setUrl("**/login"), () -> {
page.click("a"); // Triggers a navigation with a script redirect
});
```
```python async
# Using Python context manager prevents a race condition
# between clicking and waiting for a navigation.
async with page.expect_navigation(url="**/login"):
# Triggers a navigation with a script redirect
await page.click("a")
```
```python sync
# Using Python context manager prevents a race condition
# between clicking and waiting for a navigation.
with page.expect_navigation(url="**/login"):
# Triggers a navigation with a script redirect
page.click("a")
```
```csharp
// Running action in the callback of waitForNavigation prevents a race
// condition between clicking and waiting for a navigation.
2021-05-26 15:50:42 -07:00
await page.RunAndWaitForNavigationAsync(async () =>
{
// Triggers a navigation with a script redirect.
await page.ClickAsync("a");
}, new PageWaitForNavigationOptions
{
UrlString = "**/login"
});
```
### Loading a popup
When popup is opened, explicitly calling [`method: Page.waitForLoadState`] ensures that popup is loaded to the desired
state.
```js
// Note that Promise.all prevents a race condition
// between clicking and waiting for the popup.
const [ popup ] = await Promise.all([
// It is important to call waitForEvent before click to set up waiting.
page.waitForEvent('popup'),
// Opens popup.
page.locator('a[target="_blank"]').click(),
]);
await popup.waitForLoadState('load');
```
```java
Page popup = page.waitForPopup(() -> {
page.click("a[target='_blank']"); // Opens popup
});
popup.waitForLoadState(LoadState.LOAD);
```
```python async
async with page.expect_popup() as popup_info:
await page.click('a[target="_blank"]') # Opens popup
popup = await popup_info.value
await popup.wait_for_load_state("load")
```
```python sync
with page.expect_popup() as popup_info:
page.click('a[target="_blank"]') # Opens popup
popup = popup_info.value
popup.wait_for_load_state("load")
```
```csharp
var popup = await page.RunAndWaitForPopupAsync(async () =>
{
await page.ClickAsync("a[target='_blank']"); // Opens popup
});
popup.WaitForLoadStateAsync(LoadState.Load);
```
### API reference
- [`method: Page.click`]
- [`method: Page.waitForLoadState`]
- [`method: Page.waitForNavigation`]
- [`method: Page.waitForFunction`]
## Advanced patterns
For pages that have complicated loading patterns, [`method: Page.waitForFunction`] is a powerful and extensible approach
to define a custom wait criteria.
```js
await page.goto('http://example.com');
await page.waitForFunction(() => window.amILoadedYet());
// Ready to take a screenshot, according to the page itself.
await page.screenshot();
```
```java
page.navigate("http://example.com");
page.waitForFunction("() => window.amILoadedYet()");
// Ready to take a screenshot, according to the page itself.
page.screenshot();
```
```python async
await page.goto("http://example.com")
await page.wait_for_function("() => window.amILoadedYet()")
# Ready to take a screenshot, according to the page itself.
await page.screenshot()
```
```python sync
page.goto("http://example.com")
page.wait_for_function("() => window.amILoadedYet()")
# Ready to take a screenshot, according to the page itself.
page.screenshot()
```
```csharp
await page.GotoAsync("http://example.com");
await page.WaitForFunctionAsync("() => window.amILoadedYet()");
// Ready to take a screenshot, according to the page itself.
await page.ScreenshotAsync();
```
### API reference
- [`method: Page.waitForFunction`]