alert before anything load

Question

I want to check if browser support pdf viewer or not before anything loads on page and then if pdf viewer is not enable, I want to display alert pdf viewer is not enable and redirect to some other page.

I tried

window.onload = function () {}

$(document).ready(function () { });

$( window ).load(function() { });

but it still shows page in background. I do not want to display page until it is confirmed that pdf viewer is installed. Please help.

You can use javascript from the HEAD section. Now how do you check for pdf viewer support? — A. Wolff, Jun 05 '14 at 10:11
@A.Wolff, I' m done with pdf viewer support functionality just about varification on page preload is remain to do. — Dhwani, Jun 05 '14 at 10:12

score 0 · Accepted Answer · answered Jun 05 '14 at 10:11

If it is enough to just hide the page, the you can put style="display: none" on root element and then if PDF is enabled you just show it

HTML

<html><head></head><body>
     <span id="hideItAll" style="display: none">
         ... Your content goes here ...
     </span>
</body>

And in javascript you just show it up

if( pdf ) document.getElementById('hideItAll').style.display = ''; else alert( ... );

Other approach is to redirect user on page with content after PDF check is ok

I think last option will be more better. – Dhwani Jun 05 '14 at 10:33 — Dhwani, Jun 05 '14 at 10:33

alert before anything load

1 Answers1