javascript - Chrome extension inject sidebar into page

Question

I would like my chrome extension to be able to inject a 300px sidebar on the right side of any page when it is activated. I am looking for the best way to constrain the entire page to document.body.clientWidth - 300, thereby leaving the 300px on the right for my sidebar. The sidebar I currently inject is appended to document.body and has a style like so:

width:300px
position: fixed
top: 0px
right: 0px
height:500px

I need a way to prevent the existing page elements from bleeding over into my sidebar. I was hoping that there would be a way to trick the existing elements into thinking that they were rendering into a browser client 300px narrower than their actual window thereby leaving space for my sidebar but I haven't found any easy way to do so...

Answer 1

I believe this is easier. First add padding to the body to make space for the sidebar. Then, create a div containing your sidebar. Position the div relative to the right and top of the page using CSS with fixed-positioning. Also set the height and width of the sidebar div.

Code (uses JQuery):

  var sidebar;
  $('body').css({
    'padding-right': '350px'
  });
  sidebar = $("<div id='sidebar'></div>");
  sidebar.css({
    'position': 'fixed',
    'right': '0px',
    'top': '0px',
    'z-index': 9999,
    'width': '290px',
    'height': '100%',
    'background-color': 'blue'  // Confirm it shows up
  });
  $('body').append(sidebar);