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How to Capture a Specific Element with ApiFlash

Capture a specific page element with ApiFlash using a CSS selector, URL encoding, and wait_for when the target is rendered late.
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To capture one element with ApiFlash, add the element parameter with a CSS selector. ApiFlash captures the first matching element. For a GET request, URL-encode the selector; if the element appears only after lazy loading, add wait_for with a selector for that element. Do not combine this with full_page=true, because full-page mode ignores element.

Make an element screenshot request

ApiFlash’s documented endpoint is https://api.apiflash.com/v1/urltoimage. Supply your access key, the page URL, and a CSS selector in element. For example, #main-content selects the element whose ID is main-content:

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https://api.apiflash.com/v1/urltoimage?access_key=YOUR_ACCESS_KEY&url=https%3A%2F%2Fexample.com&element=%23main-content

The %23 is the URL-encoded #. Encode selector characters as part of the query parameter; otherwise characters such as # can be interpreted as URL syntax instead of selector text. Replace the access-key placeholder with your ApiFlash key and the example URL with the page you want to capture.

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ApiFlash accepts GET query parameters or POST form data. It returns image bytes by default; set response_type=json if you need a JSON response instead. See the ApiFlash documentation for current parameter behavior and limits.

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Choose and verify the selector

Capture the first match

The element value is a CSS selector, and ApiFlash captures the first DOM element matching it. Prefer a selector specific enough to identify the intended content. If a selector matches several cards, for example, the result is the first match rather than a screenshot of every match.

Wait for content inserted later

When scripts or lazy loading add the target after the page begins loading, use wait_for with a selector that identifies the element. ApiFlash documents a 15-second failure timeout when nothing matches the wait_for selector. Check that the wait selector describes an element that actually appears on the page and is not merely a styling selector typo.

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ApiFlash says it waits for network idle by default, but that does not ensure every dynamically rendered target is present. Prefer a selector or page-state wait such as wait_for or wait_until when appropriate rather than starting with an arbitrary fixed delay. Consult its documentation for the available wait conditions.

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Pick the right capture mode

  • One DOM element: Use element with a CSS selector. It captures the first match.
  • A rectangular region: Use crop with left, top, width, and height values when the target is defined by coordinates rather than a DOM element.
  • The whole page: Use full_page=true. In this mode, ApiFlash ignores element.
  • Overlapping content: Consider element_overlap if the capture should include elements overlapping the selected element.

Output format, viewport dimensions, and additional wait controls are also available. Their current values and constraints are subject to ApiFlash’s documentation.

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Troubleshoot missing or incorrect captures

  • The screenshot shows the wrong content: The selector may match more than one element. Narrow it so the intended target is the first match.
  • No element appears or the wait fails: Verify the selector against the rendered page and use it in wait_for when content is inserted late. ApiFlash documents failure after 15 seconds if the wait selector does not match.
  • The entire page is captured instead: Check whether full_page=true is enabled. It takes precedence in practice because element capture is ignored in full-page mode.
  • The request behaves as if the selector is missing: URL-encode the selector in a GET request, especially characters such as #.
  • The page is blocked: Sites using Cloudflare or similar bot protection may prevent capture. ApiFlash says a proxy may help depending on the protection, but it is not a guaranteed bypass.
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ScreenshotNeo can capture a page through one GET request; its API documentation describes the available parameters. For an element capture, use its CSS-selector option:

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Frequently Asked Questions

Does ApiFlash capture every element matched by a CSS selector?

No. It captures the first matching element.

Can I use ApiFlash element capture with a full-page screenshot?

No. When full_page=true, ApiFlash ignores element.

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