jquery - Collapse and expand all -

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I am trying to expand / collapse all the functionality I have a list of expandable items, the top right With a button that allows users to expand and collapse everything.

Currently, my code works if everything increases / collapses, but does not work properly when the user expands certain elements (and not all) it only collapsed / expanded Switching Elements

Here is my jQuery code that is running: 

  $ ('div.srcprojects'). Hide (); $ ('. Projectscontainer'). ("Click", "span.destproject", function () {$ (this) .siblings ('.srcprojects') toggle () .inter (.). Siblings ('div' ("click", "div ("Click"); $ (this) .Parent "Span # expandcollapse", function () {$ (this) .text (function (i, current text) {current text on current === 'expand all'? 'Collapse all': 'expand all ("Click");});   
 How can I make it / Sus So that my #expressed calculation really can expand to everyone / everyone collapses?   
 
 
 Without fully detecting my code, I just want to tell that the jQuery  toggle  method simply  show  to  hide  and vice versa. If you want to toggle only one direction, then you can:  
  to show (correct)  and show the  .toggle (false )

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