I'm trying to do so "Projectile motion" experiment.
in HTML
<div>
<label for="angle">Angle</label>
<input id="angle" name="angle" type="number" max="90" min="0" value=50 ></input>
<label for="velocity">Velocity</label>
<input id="velocity" name="velocity" type="number" value=150></input>
<button id="launch">Launch</button>
<button id="reset">Reset</button>
</div>
And in JS:
let v = document.getElementById("velocity").value;
let degreeAngle = document.getElementById("angle").value;
I can change the value of V and Angle in the input by this is no effect on the value. (always v is 150 and angle 50)
why ? and how can I change those values?
You seem to be looking for a way to respond to changes in the values set by the user. What you're looking for is an event handler (https://developer.mozilla.org/en-US/docs/Web/Events/Event_handlers).
Event handlers allow you to attach a callback function to an element and have it execute whenever some event occurs.
You can attach an event handler to the click event on the #launch button and run your calculations/simulation like so:
function onLaunchClicked() {
let v = document.getElementById("velocity").value;
let degreeAngle = document.getElementById("angle").value;
// Run simulation
}
let launchButton = document.getElementById("launch");
launchButton.addEventListener("click", onLaunchClicked);