When to use window opener window parent window top

Question

In JavaScript when to use window opener   window parent   window top

User · Answer

when you are dealing with popups window opener plays an important role  because we have to deal with fields of parent page as well as child page  when we have to use values on parent page we can use window opener or we want some data on the child window or popup window at the time of loading then again we can set the values using window opener

User · Answer

I think you need to add some context to your question   However  basic information about these things can be found here   window opener https   developer mozilla org en-US docs Web API Window opener  I ve used window opener mostly when opening a new window that acted as a dialog which required user input  and needed to pass information back to the main window   However this is restricted by origin policy  so you need to ensure both the content from the dialog and the opener window are loaded from the same origin   window parent https   developer mozilla org en-US docs Web API Window parent  I ve used this mostly when working with IFrames that need to communicate with the window object that contains them   window top https   developer mozilla org en-US docs Web API Window top  This is useful for ensuring  you are interacting with the top level browser window  You can use it for preventing another site from iframing your website  among other things   If you add some more detail to your question  I can supply other more relevant examples   UPDATE  There are a few ways you can handle your situation  You have the following structure    Main Window  Dialog 1  Dialog 2 Opened By Dialog 1     When Dialog 1 runs the code to open Dialog 2  after creating Dialog 2  have dialog 1 set a property on Dialog 2 that references the Dialog1 opener   So if  childwindow  is you variable for the dialog 2 window object  and  window  is the variable for the Dialog 1 window object  After opening dialog 2  but before closing dialog 1 make an assignment similar to this   childwindow appMainWindow   window opener   After making the assignment above  close dialog 1  Then from the code running inside dialog2  you should be able to use  window appMainWindow to reference the main window  window object   Hope this helps

User · Answer

top  parent  opener  as well as window  self  and iframe  are all window objects    window opener -  returns the window that opens or launches the current popup window  window top -  returns the topmost window  if you re using frames  this is the frameset window  if not using frames  this is the same as window or self  window parent -  returns the parent frame of the current frame or iframe  The parent frame may be the frameset window or another frame if you have nested frames  If not using frames  parent is the same as the current window or self

User · Answer

window opener refers to the window that called window open        to open the window from which it s called window parent refers to the parent of a window in a  lt frame gt  or  lt iframe gt  window top refers to the top-most window from a window nested in one or more layers of  lt iframe gt  sub-windows   Those will be null  or maybe undefined  when they re not relevant to the referring window s situation     Referring window  means the window in whose context the JavaScript code is run

[javascript] When to use window.opener / window.parent / window.top

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