jQuery more than one handler for same event

Question

What happens if I bind two event handlers to the same event for the same element   For example   var elem            elem click       elem click         Does the last handler  win   or will both handlers be run

User · Answer

jQuery s  bind   fires in the order it was bound      When an event reaches an element  all handlers bound to that event   type for the element are fired  If there are multiple handlers   registered  they will always execute in the order in which they were   bound  After all handlers have executed  the event continues along the   normal event propagation path    Source  http   api jquery com bind   Because jQuery s other functions  ex   click    are shortcuts for  bind  click   handler   I would guess that they are also triggered in the order they are bound

User · Answer

There is a workaround to guarantee that one handler happens after another  attach the second  handler to a containing element and let the event bubble up  In the handler attached to the container  you can look at event target and do something if it s the one you re interested in   Crude  maybe  but it definitely should work

User · Answer

You should be able to use chaining to execute the events in sequence  e g        target      bind  click  function event        alert  Hello             bind  click  function event        alert  Hello again             bind  click  function event        alert  Hello yet again             I guess the below code is doing the same      target          click function event            alert  Hello                     click function event            alert  Hello again                     click function event            alert  Hello yet again                 Source  http   www peachpit com articles article aspx p 1371947 amp seqNum 3  TFM also says      When an event reaches an element  all handlers bound to that event   type for the element are fired  If there are multiple handlers   registered  they will always execute in the order in which they were   bound  After all handlers have executed  the event continues along the   normal event propagation path

User · Answer

Both handlers will run  the jQuery event model allows multiple handlers on one element  therefore a later handler does not override an older handler   The handlers will execute in the order in which they were bound

User · Answer

Made it work successfully using the 2 methods  Stephan202 s encapsulation and multiple event listeners  I have 3 search tabs  let s define their input text id s in an Array   var ids   new Array  searchtab1    searchtab2    searchtab3      When the content of searchtab1 changes  I want to update searchtab2 and searchtab3  Did it this way for encapsulation   for  var i in ids                ids i   change function             for  var j in ids                if  this    ids j                             ids j   val   this  val                                         Multiple event listeners   for  var i in ids        for  var j in ids            if  ids i     ids j                         ids i   change function                             ids j   val   this  val                                         I like both methods  but the programmer chose encapsulation  however multiple event listeners worked also  We used Chrome to test it

User · Answer

Both handlers get called   You may be thinking of inline event binding  eg  onclick        where a big drawback is only one handler may be set for an event   jQuery conforms to the DOM Level 2 event registration model      The DOM Event Model allows   registration of multiple event   listeners on a single EventTarget  To   achieve this  event listeners are no   longer stored as attribute values

User · Answer

Suppose that you have two handlers  f and g  and want to make sure that they are executed in a known and fixed order  then just encapsulate them            click function event     f event     g event         In this way there is  from the perspective of jQuery  only one handler  which calls f and g in the specified order

User · Answer

jquery will execute both handler since it allows multiple event handlers  I have created sample code  You can try it  demo

[javascript] jQuery: more than one handler for same event

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