Trigger change event when setting select s value with val function

Question

What is the easiest and best way to trigger change event when setting the value of select element   I ve expected that executing the following code     select some   val 10     or     select some   attr  value    10     would result in triggering the change event  which i think is pretty logic thing to be done  Right   Well  it isn t the case  You need to triger change   event by doing this     select some   val 10  change      or     select some   val 10  trigger  change      but i m looking for some solution which would trigger change event as soon as select s value is changed by some javascript code

User · Answer

I separate it  and then use an identity comparison to dictate what is does next        selectField   change function      if this value      textValue1        contentClass1   fadeIn        if this value      textValue2        contentclass2   fadeIn

User · Answer

The straight answer is already in a duplicate question  Why does the jquery change event not trigger when I set the value of a select using val     As you probably know setting the value of the select doesn t trigger the change   event  if you re looking for an event that is fired when an element s value has been changed through JS there isn t one   If you really want to do this I guess the only way is to write a function that checks the DOM on an interval and tracks changed values  but definitely don t do this unless you must  not sure why you ever would need to     Added this solution  Another possible solution would be to create your own  val   wrapper function and have it trigger a custom event after setting the value through  val    then when you use your  val   wrapper to set the value of a  lt select gt  it will trigger your custom event which you can trap and handle    Be sure to return this  so it is chainable in jQuery fashion

User · Answer

I had a very similar issue and I m not quite sure what you re having a problem with  as your suggested code worked great for me   It immediately  a requirement of yours  triggers the following change code       selectField   change function        if     selectField   val       N                secondaryInput   hide          else               secondaryInput   show            Then I take the value from the database  this is used on a form for both new input and editing existing records   set it as the selected value  and add the piece I was missing to trigger the above code    change          selectField   val valueFromDatabase  change      So that if the existing value from the database is  N   it immediately hides the secondary input field in my form

User · Answer

One thing that I found out  the hard way   is that you should have       selectField   change function         some content           defined BEFORE you are using       selectField   val 10  trigger  change      or       selectField   val 10  change

User · Answer

As jQuery won t trigger native change event but only triggers its own change event  If you bind event without jQuery and then use jQuery to trigger it the callbacks you bound won t run    The solution is then like below  100  working     var sortBySelect   document querySelector  select your-class     sortBySelect value    new value    sortBySelect dispatchEvent new Event  change

[jquery] Trigger change() event when setting <select>'s value with val() function

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