One variable for two function in JS

Question

I dev a little game, and I went at the beginning of the game, the gravity at -40, but after if the player wants to change it, he can.

I have this form:

<form>
     <input type="text" id="userInput" />
     <input type="submit" onclick="otherG();" />
</form>

My gravity is:

function initScene() {
   blablabla
   scene.setGravity(new THREE.Vector3(0, -40, 0));
   blablabla
}

How can I change the -40 by the input of the user, and allow the scene (no need do f5) ?

The form appear when the user wants to change gravity via a keypress.

PS: I'm using three.js and physijs.

Submit is refreshing the page. Add return false at the end of the function to prevent this. — Anonymoose
– Anonymoose, Commented Apr 3, 2014 at 15:15
the question appears to be about how to use user input in your code. make a variable and set it to the value that the user enters. use this variable in your code. — akonsu
– akonsu, Commented Apr 3, 2014 at 15:15
But not scene.setGravity(new THREE.Vector3(0, someNewValue, 0)); ? — vp_arth
– vp_arth, Commented Apr 3, 2014 at 15:16
Yes, but in intscene() i have many thing like draw car, the ground... — flavien317
– flavien317, Commented Apr 3, 2014 at 15:16

R3tep · Accepted Answer · 2014-04-03 16:42:30Z

2

Maybe something like this

HTML :

<form onsubmit="return otherG();">
   <input type="text" id="userInput" />
   <input type="submit" value="Change Gravity" />
</form>

Javascript :

var gravity = -40; // default value
var doc = document;

function otherG() {
    gravity = doc.getElementById("userInput").value;
    updateScene();
    return false;
}

function updateScene() {
  blablabla
  scene.setGravity(new THREE.Vector3(0, gravity, 0));
  blablabla
}

edited Apr 3, 2014 at 16:42

answered Apr 3, 2014 at 15:20

R3tep

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3 Comments

flavien317 Over a year ago

in need change onclick="otherG"();" ?

flavien317 Over a year ago

ok, updateScene and initScene is same function or not ? because initScen draw all, but updatescene do same with new gravity ?

flavien317 Over a year ago

when i set the new gravity, the game freeze, i initscen with -40, if want chnage, the form call setnewgravity, and put 5, but frezze after that

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