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javascript - Finding whether the element exists in whole html page

I want to check whether an element exists in the whole page or not. Is there any way to know if the element exists in the page through jQuery?

For example:

<html>
     <body>
        <p id="para1" class="para_class"></p>
     </body>
</html>

In the above code, I have to check whether <p> of id para1 exists in the DOM or not. In any case if with the help of the 'class' attribute we can know if the element exists, it also would be helpful.

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by (71.8m points)

For element IDs:

if($('#para1').length){
  //element with id exists
}

For element class:

if($('.para_class').length){
  //element with class exists
}

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