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Code Issues Projects Releases Wiki Activity

docs: add guide for print dialogs (#31340)

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https://github.com/microsoft/playwright-internal/issues/211
Relates https://github.com/microsoft/playwright/issues/6543
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docs/src/dialogs.md
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@ -5,7 +5,7 @@ title: "Dialogs"
## Introduction
Playwright can interact with the web page dialogs such as [`alert`](https://developer.mozilla.org/en-US/docs/Web/API/Window/alert), [`confirm`](https://developer.mozilla.org/en-US/docs/Web/API/Window/confirm), [`prompt`](https://developer.mozilla.org/en-US/docs/Web/API/Window/prompt) as well as [`beforeunload`](https://developer.mozilla.org/en-US/docs/Web/API/Window/beforeunload_event) confirmation.
Playwright can interact with the web page dialogs such as [`alert`](https://developer.mozilla.org/en-US/docs/Web/API/Window/alert), [`confirm`](https://developer.mozilla.org/en-US/docs/Web/API/Window/confirm), [`prompt`](https://developer.mozilla.org/en-US/docs/Web/API/Window/prompt) as well as [`beforeunload`](https://developer.mozilla.org/en-US/docs/Web/API/Window/beforeunload_event) confirmation. For print dialogs, see [Print](#print-dialogs).
## alert(), confirm(), prompt() dialogs
@ -126,3 +126,55 @@ Page.Dialog += async (_, dialog) =>
};
await Page.CloseAsync(new() { RunBeforeUnload = true });
```
## Print dialogs
In order to assert that a print dialog via [`window.print`](https://developer.mozilla.org/en-US/docs/Web/API/Window/print) was triggered, you can use the following snippet:
```js
await page.goto('<url>');
await page.evaluate('(() => {window.waitForPrintDialog = new Promise(f => window.print = f);})()');
await page.getByText('Print it!').click();
await page.waitForFunction('window.waitForPrintDialog');
```
```java
page.navigate("<url>");
page.evaluate("(() => {window.waitForPrintDialog = new Promise(f => window.print = f);})()");
page.getByText("Print it!").click();
page.waitForFunction("window.waitForPrintDialog");
```
```python async
await page.goto("<url>")
await page.evaluate("(() => {window.waitForPrintDialog = new Promise(f => window.print = f);})()")
await page.get_by_text("Print it!").click()
await page.wait_for_function("window.waitForPrintDialog")
```
```python sync
page.goto("<url>")
page.evaluate("(() => {window.waitForPrintDialog = new Promise(f => window.print = f);})()")
page.get_by_text("Print it!").click()
page.wait_for_function("window.waitForPrintDialog")
```
```csharp
await Page.GotoAsync("<url>");
await Page.EvaluateAsync("(() => {window.waitForPrintDialog = new Promise(f => window.print = f);})()");
await Page.GetByText("Print it!").ClickAsync();
await Page.WaitForFunctionAsync("window.waitForPrintDialog");
```
This will wait for the print dialog to be opened after the button is clicked.
Make sure to evaluate the script before clicking the button / after the page is loaded.