Attach event using Javascript -

i'd attach event when function called, seems not working using addeventlistener...

my code :

function add () {   this.inputstring.input.addeventlistener('mouseover', toggle.call(this)); }  function toggle () {   $(this.tooltip).toggle(); } 

issue : toggle() function doesn't work. however, this.inputstring.input , this.tooltip not emtpy...

the apparent problem see here should attach function addeventlistener's second argument, not call itself:

this.inputstring.input.addeventlistener('mouseover', toggle); 

then should consider reviewing toggle() function itself.
mean this.tooltip ?

but out of scope of question (about attaching events).