Modify Java variable within JavascriptExecutor

Question

Is it possible to modify the value of a Java variable from within Selenium JavascriptExecutor?

I know it is possible to access Java variables inside JavascriptExecutor as '"+myjavavar+"' but how do we modify it?

If I use '"+myjavavar+"'= somenewvalue; it fails with error "invalid assignment left-hand side".

You are probably confusing java and javascript here. You want to modify a javascript variable through JavascriptExecutor, right? — alecxe
– alecxe, Commented May 14, 2015 at 11:28
@alecxe No, I want to access and modify a java variable through JavascriptExecutor. — bpk
– bpk, Commented May 14, 2015 at 11:33
Could you add more details about the motivation behind this kind of requirement? — alecxe
– alecxe, Commented May 14, 2015 at 11:34
Basically what I am looking to achieve here is either (1) OR (2) of below. (1) As my JavascriptExecutor modifies some javascript variables, I need that values to be available within the java program. A kind of global javascript variable which can be used within both java and javascript. (2) I have a java variable which has some initial value. I need to pass this value to JavascriptExecutor and within the JavascriptExecutor I will update this value on some conditions and then continue the java program with the new value. I don't want to use any cookies based global storage here. — bpk
– bpk, Commented May 14, 2015 at 11:58

alecxe · Accepted Answer · 2015-05-14 12:02:47Z

4

You can both get and set javascript variables through JavascriptExecutor. To have a "global" variable during your test session available in every script you execute, keep it on the global window object. Example:

JavascriptExecutor js = (JavascriptExecutor) driver;

// set the value (note how the arguments are passed into)
js.executeScript("window.myvar = arguments[0];", "Test");

// get the value (note the "return")
String myvar = (String) js.executeScript("return window.myvar;");
System.out.println(myvar);

answered May 14, 2015 at 12:02

alecxe

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1 Comment

bpk Over a year ago

Thanks...! Fair enough.

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