Run JavaScript Script snippet automatically

I want to run a script snippet on the SAP BO "Query Builder", it's a simple tool to retrieve data using SQL. (I can't upload the image due to the reputation, the product's interface can be found here: http://scn.sap.com/docs/DOC-42952)

Since I have a bunch of queries to run, I want to use snippet to run them automatically. Using the following code:

    //select the textarea to insert retrieved queries
    document.querySelector("textarea").textContent = "SELECT * FROM CI_INFOOBJECTS";
    //click the submit button
    document.getElementsByTagName('input')[0].click();
    //code to export the query result
    //after click(), the page reloaded and it won't executed the following code.
    document.addEventListener("DOMContentLoaded", function() {
    //back to the previous page, run the previous code again
        window.history.back(1);
        }, false);

Does anyone have good ideas how to implement it? Thanks for your help.

Alan