OK good.
You can use the webviewstring to transfer the username to the app. You will need to add some code to your javascript to set the webviewstring when the username is entered (no doubt you have a button event listener already from attempting localStorage)
You can then save the captured username in your app using tinyDB for later use, e.g. to pass the username back to the web page, also using the webviewstring.
Mmmmm,thanks.
So you mean in my javascript, if user name was input, then webviewer event becomes a trigger and it saved in TinyDB?
Do you know a specific example which I can refer to how to do it?
If I get time, I will work up an example for you.
Here is a self contained example, using a local html file.
Click button to open web page.
Enter username.
Username is passed to the webviewstring and saved to the tinydb on pressing the Submit button
Open the web page again, and the saved username is returned to the web page
Click the Clear Username button to remove the username from the tinydb, and variables and reset the web page
SaveAndReturnUserName.aia (3.1 KB)
<!DOCTYPE html>
<html>
<meta name=“viewport” content=“width=device-width, initial-scale=1.0”>
<head>
<title>Username</title>
</head>
<body>
<div class="container"><br>
<label for="uname"><b>Username</b></label><br><br>
<input id = "inputusername" type="text" placeholder="Enter Username" ><br><br>
<button id="submitButton" onclick="getUserName()" >Submit</button><br>
</div>
</body>
<script>
var username = window.AppInventor.getWebViewString();
if (username !="") {
document.getElementById("inputusername").value = username;
document.getElementById("submitButton").style.visibility = "hidden";
} else {
document.getElementById("submitButton").style.visibility = "visible";
}
function getUserName() {
window.AppInventor.setWebViewString(document.getElementById("inputusername").value);
document.getElementById("submitButton").style.visibility = "hidden";
}
</script>
</html>
Thank you so much for your support.
This code is very new to me but I will try to understand and I will challenge it! 
TIMAI2 san
I need your advice.
In my webpage, in javascript code, I just want to save usename into TinyDB.
var username="ABCD"
How can I save it?
window.AppInventor.setWebViewString(username);
Is this code used to save name inside TinyDB?
Yes, that will get it on the JavaScript side, in you app you need to get that value and save to tinydb.
This would be sufficient to just save the value to a tinydb tag
You can call the tag value back later by using:
Thank you so much.
I find some error when loading html.
Uncaught (in promise) TypeError: window.AppInventor is undefined
Do I need some definition ( add some in html ?) to use window.AppInventor.getWebViewString(); ?
I am not seeing the same problem, with these blocks and html:
<!DOCTYPE html>
<html>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<head>
<title>Username</title>
</head>
<body>
<div class="container"><br>
<label for="uname"><b>Username</b></label><br><br>
<input id = "inputusername" type="text" placeholder="Enter Username" ><br><br>
<button id="submitButton" onclick="getUserName()" >Submit</button><br>
</div>
</body>
<script>
function getUserName() {
var username = document.getElementById("inputusername").value;
window.AppInventor.setWebViewString(username);
}
</script>
</html>
This will only work when connected to a App Inventor companion app or with a compiled app. Computer browsers / jsFiddle do not know about webviewstring().
In your jsFiddle, if you comment out the webviewstring line, then the alert will show.
Now I see it.
Thank you so much for your support.
Could I ask you one more question?
I found custom webview can use browser cookie.
Can I save username into cookie and after closed apk app and open again,
I want to use the same user name which was already saved in a cookie.
My user name is made below code.
$(function () {
$("#name").click(function () {
$("#div4").dialog({
modal: true, //モーダル表示
title: "Input username, please", //タイトル
buttons: { //ボタン
"confirm": function () {
$("#p4").text($("#input1").val());
$(this).dialog("close");
username = $("#input1").val();
},
"cancel": function () {
$(this).dialog("close");
}
}
});
});
});
In this case, where/how can I add a MIT2 script as cookie save code?
I don't know. Perhaps @vknow360 (who developed the Custom webview extension) can advise on what you are trying to do?
That's not right.
You can't access cookies stored in other apps.
Oh, I see it.
Thank you very much.
I gave up cookie save and I am still trying TinyDB again...
Below is my website javascript code and this is to save username into TinyDB.
$(function () {
$("#name").click(function () {
$("#div4").dialog({
modal: true, //モーダル表示
title: "Input username, please", //タイトル
buttons: { //ボタン
"confirm": function () {
$("#p4").text($("#input1").val());
$(this).dialog("close");
username = $("#input1").val();
window.AppInventor.setWebViewString(username);////////I added it.
},
"cancel": function () {
$(this).dialog("close");
}
}
});
});
});
And I added below code to load a username from TinyDB when I open website from MIT app.
var username = window.AppInventor.getWebViewString();
So if I input usename from MIT app, it looks like username was saved into Tiny DB because username is shown on the screen but once I close the application and re-start it,
next time username is not shown (blank).
I wonder if this is due to that username was not saved correctly or there is some problem to load username from TinyDB.
I will also attach full Blocks code.
