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| Info |
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Source: https://github.com/e3ds/E3DS-Iframe-Demo/tree/iframe-demo-html Iframe Demo: https://iframe.eagle3dstreaming.com/ ReactJS Iframe Demo: https://iframe_react.eagle3dstreaming.com/ UE5 Iframe Demo: https://iframe_ue5.eagle3dstreaming.com/ Unreal project source code used in the demo: https://bitbucket.org/Eagle3DStreaming/e3dsfeaturestemplate/ |
Overview
Communication means refers to the transmission of data between two people individuals or entities. Where one will send data and another one will receive it , where one sends data and the other receives it, and vice versa.
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1
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. Sending data from the parent
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Webpage to the Unreal App
To communicate with the unreal app, you must should send data from the webpage to the unreal app and the app will send you a response. Data
The data must be sent as a string to the unreal app.
To send Integer data, we have to convert the integer into a string using the toString()method.
To send a JSON object, we have to should stringify it using the JSON.stringify() method.
For an array, we need to convert it to a JSON object and then stringify the object.
Below is an example of how to send JSON data from the webpage to the unreal app.
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| Code Block | ||
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let descriptor = {
Teleport: "6"
};
let obj = {
cmd: "sendToUe4",
value: descriptor
}
document.getElementById("iframe_1").contentWindow.postMessage(JSON.stringify(obj), "*");
//here "iframe_1" is the id of the HTML iframe element |
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2
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. Manipulating the style attribute of an HTML element
This can also be achieved by sending data from the webpage . But but we need to make a few changes in the JSON object for that.
Here’s an example that hides the settings button inside within the streaming UI:
id is the ID of the HTML element whose style you are trying to change.
| Code Block |
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const toggleSettings = (id)=>{
let descriptor = {
id,
property: 'display',
value: 'none'
};
let obj =
{
cmd: "style",
value: descriptor,
}
document.getElementById("iframe_1").contentWindow.postMessage(JSON.stringify(obj), "*");
} |
Here id is the ID of the HTML element whose style you are trying to change.
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3. Receiving data from the Unreal App to the parent
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Webpage
After sending the data we will receive a response from the unreal app.
This response can be caught by using message event handler defined in the page . Here’s
Below is a detailed example of that - :
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function HandleResponseFromUE4(jsonObj) {
// Process the JSON object sent by the Unreal app to the webpage
}
const eventHandler = (event) => {
// This function will receive all kinds of events the webpage receives
// Check if event.data.type exists to identify if it was sent by the Unreal app
if (!event.data.type) {
// If event.data includes a field named cmd, then this data is coming from the Unreal app.
// If your Unreal app uses a different field name, replace this field name with the one you have used in your Unreal app
if (typeof event.data === 'string' && event.data.includes('cmd')) {
// We are receiving data as a string. Now we try to parse it to check
// if this string represents a JSON or not.
// If you are sending a normal string from the Unreal app, then this is not needed
const parsedData = JSON.parse(event.data);
if (parsedData.cmd) { // It is JSON object data sent from UE4
HandleResponseFromUE4(parsedData); // Process the data sent by UE4
}
}
}
else{
//data sent from server
messageHandler(event);
}
}
// We are binding eventHandler to receive all kinds of messages the webpage receives
window.addEventListener("message", eventHandler);
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Part-4 :
Set Custom Resolution from Webpage with Iframe
Go to the following document to learn about how to set custom resolution from your webpage.
Part-5:
How to send a Pixel Streaming Response from unreal app to webpage
Useful Events:
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4. Receiving Non-Unreal Data from an Iframe on a Webpage
If a message doesn’t contain event.data.type, it is sent to messageHandler function.
See this document to learn different types of event sent to messageHandler.
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const messageHandler = (event) => {
const loaderStep1 = document.getElementById("loaderStep1");
const loaderStep2 = document.getElementById("loaderStep2");
const loaderStep3 = document.getElementById("loaderStep3");
const iframeElem = document.getElementById("iframe_1");
const sidebar = document.getElementById("sidebar");
console.log("received data event type " + event.data.type)
switch (event.data.type) {
case "ResponseFromUE4":
console.log("UE4->iframe: " + event.data.descriptor)
myHandleResponseFunction(event.data.descriptor);
break;
case "stage1_inqueued":
loaderStep1.style.visibility = "visible";
break;
case "stage2_deQueued":
// loading screen 1 hides
break;
case "stage3_slotOccupied":
loaderStep1.style.display = "none";
loaderStep2.style.visibility = "visible";
break;
case "stage4_playBtnShowedUp":
//loading screen 2 hides
loaderStep2.style.visibility = "hidden";
iframeElem.style.visibility = "visible";
// loaderStep3.style.visibility = "visible";
let playButton = document.getElementById("playButtonParent");
playButton.click();
onPlayBtnPressed();
break;
case "stage5_playBtnPressed":
sidebar.style.visibility = "visible";
loaderStep2.style.display = "none";
iframeElem.style.visibility = "visible";
$('#iframe_1').focus();
break;
case "_focus":
document.getElementById("iframe_1").focus();
break;
case "isIframe":
let obj = {
cmd: 'isIframe',
value: true
};
document.getElementById("iframe_1").focus();
document.getElementById("iframe_1").contentWindow.postMessage(JSON.stringify(obj), "*");;
break;
case "QueueNumberUpdated":
console.log("QueueNumberUpdated. New queuePosition: : " + event.data.queuePosition)
break;
case "stage3_1_AppAcquiringProgress":
console.log("stage3_1_AppAcquiringProgress percent: " + JSON.stringify( event.data.percent))
break;
case "stage3_2_AppPreparationProgress":
console.log("stage3_2_AppPreparationProgress percent:" + JSON.stringify( event.data.percent))
break;
case "shortCuts":
console.log("Key pressed");
break;
case "Error_Redirect":
loaderStep2.style.display = "none";
iframeElem.style.visibility = "visible";
$('#iframe_1').focus();
default:
console.error("Unhandled message data type");
break;
}
} |
5. Setting a Custom Resolution via an Iframe on a Webpage
Refer to this document to learn how to set a custom resolution on your webpage.
6. Sending a Pixel Streaming Response from the Unreal App to the Webpage
Refer to this document.
Useful Events
See this document for Useful Events in Iframe Solution.
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More detailed docdocuments to embed iframe to any webpage: Refer to Multiplayer Demo, Embed Stream into Webpage using iFrame and communicate with Unreal App. |
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