The jQuery is() method will return a boolean value(true/false) by checking the given element or set of elements against an expression or filter. The method will return true, if the given element or at-least one element in the given set of elements is matched with the expression or filter. Otherwise, it will return false.
Example:
  1. <html>
  2. <body>
  3. <!-- Set of div elements with different id -->
  4. <div id="div1">Div1</div>
  5. <div id="div2">Div2</div>
  6. <div id="div3">Div3</div>
  7. <div id="div4">Div4</div>
  9. <script src="https://code.jquery.com/jquery-1.9.1.js"></script>
  10. <script>
  11. $(function()
  12. {
  13. //Example with set of div elements. $('div') means the entire div in the current document.
  15. //return true, because at-least one div element in the set of div elements has the id '#div1'
  16. alert($('div').is('#div1'));
  17. //return false, because none div element in the set of div elements has the id '#div5'
  18. alert($('div').is('#div5'));
  19. //return false, because none div element in the set of div elements is hidden.
  20. alert($('div').is(':hidden'));
  22. /*Example to use the is() method with single element. Here the expression/filter checked
  23. with given element only.*/
  25. //return true, because the given div element div1 is visible, not hidden.
  26. alert($('#div1').is(':visible'));
  28. //now hide the div1 element, and check again.
  29. $('#div1').hide();
  30. //now it will be false, because the div1 element is hidden.
  31. alert($('#div1').is(':visible'));
  32. });
  33. </script>
  34. </body>
  35. </html>
For more details and live demo with source code
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