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Explain how to test if element attached to main DOM #725

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Explain how to test if element attached to main DOM #725

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11 changes: 11 additions & 0 deletions page/using-jquery-core/faq/how-do-i-test-whether-an-element-exists.md
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Expand Up @@ -17,3 +17,14 @@ Note that it isn't always necessary to test whether an element exists. The follo
```
$( "#myDiv" ).show();
```

If you need to understand if element is present in main DOM tree, or if you're previously stored selector set in variable, use [jQuery.contains](https://api.jquery.com/jQuery.contains/)

```
var elements = $('#myDiv');
if ($.contains(document, elements)) {
elements.show();
}
```

Because modern browsers detaching elements in [DocumentFragment](https://developer.mozilla.org/ru/docs/Web/API/Document/createDocumentFragment), `.length` will always return constant value, even if element already removed from page.