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runtime.getFrameId() - Mozilla | MDN
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runtime.getFrameId()
Returns the frame ID of any window global or frame element when called from a content script or extension page, including background pages.
Syntax
js
let gettingInfo = browser.runtime.getFrameId(
target // object
)
Parameters
target-
A WindowProxy or a browsing context container Element (iframe, frame, embed, or object) for the target frame.
Return value
Returns the frame ID of the target frame, or -1 if the frame doesn't exist.
Examples
This code recursively walks descendant frames and gets parent frame IDs.
js
const parents = {};
function visit(win) {
const frameId = browser.runtime.getFrameId(win);
const parentId = browser.runtime.getFrameId(win.parent);
parents[frameId] = win.parent !== win ? parentId : -1;
try {
const frameEl = browser.runtime.getFrameId(win.frameElement);
browser.test.assertEq(frameId, frameEl, "frameElement id correct");
} catch (e) {
// Can't access a cross-origin .frameElement.
}
for (const frame of win.frames) {
visit(frame);
}
}
visit(window);
Browser compatibility
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