Having problem about webview sync

[Adobe]

this code crashes when i click button...
if i remove while block, the String2Hex procedure returns nothing...
what should i do?

[Gordon_Lu]

Can you please post the full JS code here?

[Adobe]

wstring = window.AppInventor.getWebViewString();bytes = new TextEncoder().encode(wstring);result = "";for (let i = 0; i !== bytes.length; i++) {result += ((bytes[i])>>>0).toString(16);}window.AppInventor.setWebViewString(result);

[Gordon_Lu]

Just to be clear, are you trying to encode a string to hex value?

[Adobe]

yeah

[Gordon_Lu]

Try this.

Script (modified from Javascript: Unicode string to hex - Stack Overflow):

    var hex;
    var result = "";
    for (i = 0; i < text.length; i++) {
        hex = text.charCodeAt(i).toString(16);
        result += (hex).slice(-4);
    }
    window.AppInventor.setWebViewString(result)

AIA:
encode.aia (2.0 KB)

[Adobe]

i wanna make the procedure to return the result, not the WebViewStringChanged event changes text :<

[Gordon_Lu]

I don't think you can, because you need to wait for a moment to return the result (and the nature of App Inventor).

[Juan_Antonio]

RunJavaScript examples. Ascii. PrettyJson. Evaluate. indexOf. Countdown

15.- String to Hex. str = 'Hola'; hex = ''; for (i = 0; i < str.length; i++) {hex += str.charCodeAt(i).toString(16).padStart(2, '0'); }; [javascript_string_hex]

[Adobe]

oh....
then is there any way to convert string into hex without using js?

[Juan_Antonio]

Here you have an extension, but it has the same synchronization problem.

[Free] Evaluate JavaScript Extension. Math expression. Source code

the extension is really interesting and necessary. it's a pity that such a feature. In fact, the need for such a block disappears. and it's sad that all this works in the WebView component (I wanted to use this extension on a wearable device running Wear, but there is no android.webkit

[Adobe]

wait, then converting string into hex is possible by making extension?

[TIMAI2]

@Adobe

converting string into hex is possible by making extension?

Converting A String To Hexadecimal In Java

[ABG]

Here are some blocks you can drag into the Blocks Editor ...

AsciiCHRASCprocedures.aia (4.4 KB)

AsciiCHRASCprocedures.aia (4.4 KB)