How to access Javascript function using JSR223 Sampler in JMeter?

Question

I have a Javascript function in JSR223 Sampler and I would like to call this function in my HTTP Request sampler. Any idea how to call the function?

Example:

I know I can do something like this and use the "total" variable from my HTTP Request Sampler.

var total;
function sum(a, b){
    return a+b;
};
vars.put("total", sum(2,4));

But is there a way to call the function sum(a,b) directly from HTTP Request sampler? If not, is there any other way to do this? A sample example will really help me a lot.

Dmitri T · Accepted Answer · 2018-04-17 17:27:17Z

1

First of all, are you aware of __intSum() function which does exactly what you're trying to achieve, the syntax would be:

${__intSum(2,4,total)}

If you still want to proceed with coding:

Don't use JavaScript as it might become a performance bottleneck. Since JMeter 3.1 it is strongly recommended to use Groovy for scripting.
Create a file, i.e. sum.groovy in "bin" folder of your JMeter installation and put the following code into "Script" area:
```
int sum (int a, int b) {
    return a + b;
}
```
Run JMeter as follows:
```
jmeter -Jgroovy.utilities=sum.groovy
```
If you want to make the change permanent - add the relevant line to user.properties file
```
groovy.utilities=sum.groovy
```
See Apache JMeter Properties Customization Guide for more detailed information on setting and overriding JMeter properties
You will be able to sum numbers with __groovy function like:
```
${__groovy(sum(2\, 4),total)}
```

answered Apr 17, 2018 at 17:27

Dmitri T

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1 Comment

shank087 Over a year ago

Yes, I am aware of __intSum() function. I just gave an example. Anyway, thank you for your answer. I didn't know that we are not supposed to use JS.

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