jQuery first child of this

Question

I m trying to pass  this  from a clicked span to a jQuery function that can then execute jQuery on that clicked element s first child  Can t seem to get it right      lt p onclick  toggleSection   this     gt  lt span class  redClass  gt  lt  span gt  lt  p gt    Javascript   function toggleSection element      element toggleClass  redClass        How do I reference the  first-child of element

User · Answer

This can be done with a simple magic like this       first-child   element  toggleClass  redClass      Reference  http   www snoopcode com jquery jquery-first-child-selector

User · Answer

I ve added jsperf test to see the speed difference for different approaches to get the first child  total 1000  children  given  notif       foo   jQuery ways      quot  first-child quot   notif  - 4 304 ops sec - fastest notif children  quot  first quot   - 653 ops sec - 85  slower notif children   0  - 1 416 ops sec - 67  slower  Native ways   JavaScript native  ele firstChild - 4 934 323 ops sec  all the above approaches are 100  slower compared to firstChild  Native DOM ele from jQery  notif 0  firstChild - 4 913 658 ops sec  So  first 3 jQuery approaches are not recommended  at least for first-child  I doubt that would be the case with many other too   If you have a jQuery object and need to get the first-child  then get the native DOM element from the jQuery object  using array reference  0   recommended  or  get 0  and use the ele firstChild  This gives the same identical results as regular JavaScript usage  all tests are done in Chrome Canary build v15 0 854 0

User · Answer

If you want immediate first child you need        element  first      If you want particular first element in the dom from your element then use below      var spanElement     elementId  find   redClass  first          spanElement  addClass  yourClassHere      try out   http   jsfiddle net vgGbc 2

User · Answer

element children   first      Find all children and get first of them

User · Answer

I ve just written a plugin which uses  firstElementChild if possible  and falls back to iterating over each individual node if necessary    function           var useElementChild     firstElementChild  in document createElement  div            fn firstChild   function              return this map function                 if  useElementChild                    return this firstElementChild                else                   var node   this firstChild                  while  node                        if  node type     1                            break                                            node   node nextSibling                                    return node                                      jQuery     It s not as fast as a pure DOM solution  but in jsperf tests under Chrome 24 it was a couple of orders of magnitude faster than any other jQuery selector-based method

User · Answer

If you want to apply a selector to the context provided by an existing jQuery set  try the find   function   element find   gt  first-child   toggleClass  redClass      J  rn Schou-Rode noted that you probably only want to find the first direct descendant of the context element  hence the child selector      He also points out that you could just as well use the children   function  which is very similar to find   but only searches one level deep in the hierarchy  which is all you need        element children   first   toggleClass  redClass

User · Answer

you can use DOM    this  children   first      is equivalent to   this firstChild

User · Answer

please use it like this first thing give a class name to tag p like  myp   then on use the following code    document  ready function             myp   click function               this  children   first   toggleClass  classname       this will access the span

User · Answer

Have you tried      first-child   element  toggleClass  redClass      I think you want to set your element as a context for your search  There might be a better way to do this which some other jQuery guru will hop in here and throw out at you

User · Answer

Use the children function with the  first selector to get the single first child of element   element children   first   toggleClass  redClass

[javascript] jQuery first child of "this"

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