Editing Pages with iFrames
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An iframe (inline frame) is used to embed a document inside the current document. The embedded document can be from the same site, or a different site.
Framed documents are separate/distinct from the top-level tab. A separate “instance” of PixieBrix runs in each iframe.
The Page Editor works on the top-level frame of the tab. It cannot directly select/modify elements in the document embedded within an iframe.
In selection/placement mode, when part of the page is an iframe, PixieBrix will highlight the whole iframe on hover because to the Page Editor, the iframe is a single element:
IFrames are distinct documents. To edit a document in an iframe with PixieBrix, you’ll edit the document and not the containing tab.
To extend a framed document with PixieBrix, you have two options:
Preferred: Open the framed document in its own tab and use the Page Editor
Use the Page Editor on the top-level tab, and manually write element selectors
Use the Chrome Dev Tools element selector
Select an element within the frame
Find the iframe ancestor element. It will have tag <iframe> and show a #document sub node:
Right click the src attribute value and click “Copy link address”. This will copy a link address to the clipboard (including the origin if the src attribute does not already include it)
Find the URL of the iframe (see above)
Open a new tab and navigate to the document URL
Open the Page Editor and edit the page as usual
Find the URL of the iframe (see above)
Add the mod in the Page Editor
Modify the “Sites” to match the source of the framed document
Build the mod as normal, but manually write elements selectors. (Because the Page Editor cannot select elements in iframes)
Save the Mod
Right-click on the frame and select “Reload Frame” from the Chrome context menu:
Your Mod will run inside the framed document
To run a brick in the top-level frame on the page, set the Advanced Options > Target Tab/Frame to “Top-level Frame”
To make data from an inline frame available to the Top-Level Frame, use the Assign Mod Variable brick in conjunction with the Target Tab/Frame option.
When the brick runs, it will set the mod variable of the Top-Level Frame.
To run a brick in all frames on the page, set the Advanced Options > Target Tab/Frame to “All Frames”. The brick will return an array of values (a value per frame)
To push data from a Top-Level Frame to frames on the page. Use the Assign Mod Variable brick and set the Advanced Options > Target Tab/Frame to “All Frames”.
To retrieve information from the Top-Level Frame, set Advanced Options > Target Tab/Frame for the brick to "Top-Level Frame":
To read the Mod Variables from the Top-Level Frame, use the Get shared page state brick:
Determining When to Read/Poll Information from the Top-Level Frame
An Inline Frame may load prior to the Top-Level Frame being ready. Therefore, you must take extra steps to ensure that the data is available reliably.
Some common approaches are:
If the data is loaded on page load: Use the "Wait for a DOM element” brick with Target Tab/Frame: Top-level Frame to wait for the information to be available
If the data may change: Use an Interval Trigger as the Starter Brick to poll for data
Use Wait/Sleep to provide an opportunity for the Top-Level Frame to load
To send a message to a frame on the page, use the “Post Message to a Frame” brick. The brick has the following options:
selector: the iframe to message
message: the message payload. The shape will depend on what the receiver/listener expects to receive
targetOrigin: the origin (schema, hostname, port) of the intended recipient, or * not to validate the target frame’s origin. Used to prevent sending sensitive information to the wrong location
Some Javascript applications listen for events from other frames to support events and data transfer. These applications use the Javascript
