Why my functions cannot work?

Question

I'm new to javasript programming, so I have no idea why my code cannot work properly on qualtrics. This code aims to conduct a simple research. The participants need to click the "add" button to add red balls into the box, and if they want to draw a ball from the box, they should click the "draw button". If the participants pick a red ball, they win the game. 
When I ran the code attached below, the console showed that my functions were not defined. Would you please give me some advices? Thanks a lot!
Javacript code:

Welcome to the game！

#container {
width: 200px;
height: 200px;
position: relative;
background: white;
}
#animate {
width: 20px;
height: 20px;
position: relative;
border-radius: 100%; 
background-color: red;
}

Enter

x=1;   
y=50;   
document.getElementById("myP").innerHTML="There are "+ x + " red balls and " + y + " black balls in the box.";

function qz(t){
    a=t.value
    if (a == "123456789") {
        z=x++
        document.getElementById("myP").innerHTML="There are "+ x + " red balls and " + y + " black balls in the box.";
    }

else if (a == "draw"){
        var Range = 49+x;  
        var Rand = Math.random();  
        var i = 1 + Math.round(Rand * Range);
        if (i x && i

rondev · Answer

On just going through the code, one mistake we can see is that - 'document.write' function is disabled in qualtrics. So instead of that, you can use some p tag with id to display the text.

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