49 lines
2.0 KiB
JavaScript
Executable File
49 lines
2.0 KiB
JavaScript
Executable File
// SPLICE resize handling - https://cssplice.org/
|
|
// Expected message format:
|
|
// {
|
|
// subject: lti.frameResize',
|
|
// message_id: (a unique string ID), // optional - not used
|
|
// height: ...,
|
|
// width: ...
|
|
// }
|
|
|
|
window.addEventListener('message', function (event) {
|
|
let edata = event.data;
|
|
|
|
//MoM sends event.data as a string instead of JSON
|
|
if (typeof event.data == 'string' && event.data.match(/lti\.frameResize/)) {
|
|
edata = JSON.parse(event.data);
|
|
}
|
|
|
|
if (edata.subject === "lti.frameResize") {
|
|
if ("frame_id" in edata) {
|
|
// MoM may send frame_id
|
|
let el = document.getElementById(edata['frame_id']);
|
|
document.getElementById(edata['frame_id']).style.height = edata.height + 'px';
|
|
if (edata.wrapheight && document.getElementById(edata['frame_id'] + 'wrap')) {
|
|
document.getElementById(edata['frame_id'] + 'wrap').style.height = edata.wrapheight + 'px';
|
|
}
|
|
} else if ("iframe_resize_id" in edata) {
|
|
// MoM may send iframe_resize_id
|
|
document.getElementById(edata['iframe_resize_id']).style.height = edata.height + 'px';
|
|
} else {
|
|
// No target element specified, so resize the iframe that sent the message
|
|
// event.source.frameElement is only accessible if the iframe is on the same domain
|
|
// so loop through iframes to find the one that sent the message
|
|
const iFrames = document.getElementsByTagName('iframe');
|
|
for(const iFrame of iFrames) {
|
|
if(iFrame.contentWindow === event.source) {
|
|
if (edata.height) iFrame.height = edata.height;
|
|
if (edata.width) iFrame.width = edata.width;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
});
|
|
|
|
// Currently only used by My Open Math to request a resize after knowls open
|
|
function sendResizeRequest(el) {
|
|
el.contentWindow.postMessage("requestResize", "*");
|
|
}
|