Check if element exists in jQuery

Question

How do I check if an element exists if the element is created by  append   method     elemId   length doesn t work for me

User · Answer

How do I check if an element exists       if      mydiv   length        If it is 0  it will evaluate to false  anything more than that true    There is no need for a greater than  less than comparison

User · Answer

your elemId as its name suggests  is an Id attribute  these are all you can do to check if it exists   Vanilla JavaScript  in case you have more advanced selectors     you can use it for more advanced selectors if document querySelectorAll   elemId   length     if document querySelector   elemId         you can use it if your selector has only an Id attribute if document getElementById  elemId        jQuery   if jQuery   elemId   length

User · Answer

Try to check the length of the selector  if it returns you something then the element must exists else not    if      selector   length              use this if you are using id to check           it exists      if      selector   length              use this if you are using class to check           it exists

User · Answer

elemId   length doesn t work for   me    You need to put   before element id       elemId   length ---      With vanilla JavaScript  you don t need the hash     e g  document getElementById  id here     however when using jQuery  you do need to put hash to target elements based on id just like CSS

User · Answer

You can also use array-like notation and check for the first element  The first element of an empty array or collection is simply undefined  so you get the  normal  javascript truthy falsy behaviour   var el      body   0   if  el        console log  element found   el     if   el        console log  no element found

User · Answer

If you have a class on your element  then you can try the following   if      exists content   hasClass  exists content         element available

User · Answer

You can use native JS to test for the existence of an object   if  document getElementById  elemId   instanceof Object          do something here     Don t forget  jQuery is nothing more than a sophisticated  and very useful  wrapper around native Javascript commands and properties

User · Answer

Try this   if      mydiv   length  gt  0        do something here     The length property will return zero if element does not exists

[javascript] Check if element exists in jQuery

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