puppeteer/docs/api/puppeteer.frame.waitforselector.md

61 lines
2.1 KiB
Markdown
Raw Normal View History

2022-07-05 13:41:43 +00:00
---
sidebar_label: Frame.waitForSelector
---
# Frame.waitForSelector() method
**Signature:**
```typescript
class Frame {
waitForSelector<Selector extends keyof HTMLElementTagNameMap>(
selector: Selector,
options?: WaitForSelectorOptions
): Promise<ElementHandle<HTMLElementTagNameMap[Selector]> | null>;
}
```
## Parameters
| Parameter | Type | Description |
| --------- | --------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------ |
| selector | Selector | the selector to wait for. |
| options | [WaitForSelectorOptions](./puppeteer.waitforselectoroptions.md) | <i>(Optional)</i> options to define if the element should be visible and how long to wait before timing out. |
**Returns:**
Promise&lt;[ElementHandle](./puppeteer.elementhandle.md)&lt;HTMLElementTagNameMap\[Selector\]&gt; \| null&gt;
a promise which resolves when an element matching the selector string is added to the DOM.
## Remarks
Wait for the `selector` to appear in page. If at the moment of calling the method the `selector` already exists, the method will return immediately. If the selector doesn't appear after the `timeout` milliseconds of waiting, the function will throw.
This method works across navigations.
## Example
```ts
const puppeteer = require('puppeteer');
(async () => {
const browser = await puppeteer.launch();
const page = await browser.newPage();
let currentURL;
page
.mainFrame()
.waitForSelector('img')
.then(() => console.log('First URL with image: ' + currentURL));
for (currentURL of [
'https://example.com',
'https://google.com',
'https://bbc.com',
]) {
await page.goto(currentURL);
}
await browser.close();
})();
```