Add event handler for body onload by javascript within body part

Question

We want to include a maps from Google Maps API in our document  The documentation tells to initialize the map with a function called by the onload   event of the body   The ordinary way to call    lt body onload  initialize map     gt    This doesn t work out for us because we re using Template  Toolkit and the  lt body gt  tag is already included in our wrapper  In short  The  lt body gt  tag is already printed when our javascript code starts running   I tried something like this but it does only work for onclick  not onload  I guess that s because the javascript code is beneath the  lt body gt  tag itself   var body   document getElementsByTagName  body   0    body addEventListener  load   init    false    function init             alert  it works          Any help how to fire up a Google Maps map appreciated

User · Answer

As  epascarello mentioned for W3C standard browsers  you should use   body addEventListener  load   init  false     However  if you want it to work on IE lt 9 as well you can use   var prefix   window addEventListener         on   var eventName   window addEventListener    addEventListener     attachEvent   document body eventName  prefix    load   init  false     Or if you want it in a single line   document body window addEventListener    addEventListener     attachEvent        window addEventListener    load     onload   init  false     Note  here I get a straight reference to the body element via the document  saving the need for the first line   Also  if you re using jQuery  and you want to use the DOM ready event rather than when the body loads  the answer can be even shorter       init

User · Answer

As we were already using jQuery for a graphical eye-candy feature we ended up using this  A code like    document  ready function            any code goes here     init          did everything we wanted and cares about browser incompatibilities at its own

User · Answer

You should really use the following instead  works in all newer browsers    window addEventListener  DOMContentLoaded   init  false

User · Answer

body addEventListener  load   init    false     That init   is saying run this function now and assign whatever it returns to the load event   What you want is to assign the reference to the function  not the result  So you need to drop the      body addEventListener  load   init  false     Also you should be using window onload and not body onload  addEventListener is supported in most browsers except IE 8

User · Answer

Simply wrap the code you want to execute into the onload event of the window object   window onload   function           your code here

[javascript] Add event handler for body.onload by javascript within <body> part

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