Calling one page method to another page

Hi,

I have two pages one contacts and another one contacts history.

To avoid the reputation of code, i am calling contact method in contacts history page.

using declare var window and window.contacts=this; in contacts page.

and contact history page again declare var window. and calling the method

window.contacts.gethistory(id) when i first render in contacts page and go to contacts history page click the button that time contact method calling successfully. if i render the contacts history directly and click the button means the below error is coming

ERROR TypeError: Cannot read property ‘gethistory’ of undefined. How to solve this.

Thanks in Advance

Regards,
Ramji

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