Pass value from Js to Java on keypress

Question

I need to open an url using Selenium and execute a script. After sometime on 'Escape' keypress I need to pass value back to Java program.

My Java program.

JavascriptExecutor js = (JavascriptExecutor) driver;
String content = new String(Files.readAllBytes(Paths.get("xp_simple.js")));
String str = (String) js.executeScript(content);
System.out.println("Returned from js : " + str);

My passed javascript string.

var pageName='value from webpage';
window.addEventListener('keydown', function (zEvent) {
    if (zEvent.key === 'Escape') {
    console.log("Escape is pressed");
    return getSG()
     }
} );
function getSG() {
        return pageName;
};

Issue --> Control doesn't stay until Escape key is pressed. It immediately returns back to java program with str value as null.

Not going to happen with executeScript. You probably want to look into `executeAsyncScript` — epascarello, Jul 02 '21 at 15:58
Can you suggest if I could create endless loop in js code which would break when Escape key is pressed, and thus final value gets back to java code — Amresh, Jul 02 '21 at 16:34
I am guessing you did not look up the documentation for executeAsyncScript — epascarello, Jul 02 '21 at 16:55
https://stackoverflow.com/questions/13452822/webdriver-executeasyncscript-vs-executescript — epascarello, Jul 02 '21 at 16:56

score 0 · Answer 1 · edited Jul 04 '21 at 10:36

The following code worked.

String content = new String(Files.readAllBytes(Paths.get("xpo_simple.js")));
String str = (String) js.executeAsyncScript(content);

JavaScript code

var pageName='value from webpage';
var callback=arguments[arguments.length - 1];

window.addEventListener('keydown', function (zEvent) {
    if (zEvent.key === 'Escape') {
    console.log("Escape is pressed");
        callback(getSG());
     }
} );
function getSG() {
        return pageName;
};

Pass value from Js to Java on keypress

1 Answers1