Jump to content

event.preventDefault is not a function

Carlos Carranza

Recommended Posts



I'm having issues trying to set up custom input number arrows, I'm currently learning JavaScript so I'm not really sure what I'm missing, here is my code.


<div class="orden">
                                <label for="pase por dia">Boletos deseados: </label>
                                <div class="caja_ticket">
                                    <input type="number" min="0" id="test" size="3" placeholder="0" class="ticket">
                                    <div class="botones_ticket">
                                        <input type="button" id="pase_dia_mas" value="+">
                                        <input type="button" id="pase_dia_menos" value="-">




I have 3 input with the id = test so to save some code I decided to use a querySelectorAll('#test') to get an array of them, and then when I click the button I want to call the function "mas1"

var test = document.querySelectorAll('#test');
var paseDiaMas = document.querySelector('#pase_dia_mas');

paseDiaMas.addEventListener('click', mas1(event, 0));

    function mas1(event, e) {
        let test_value = e;
        console.log('it works');


however when I try to pass the values it doesn't works, if I remove the variables "test_value" and "e" and add a fixed value like "test[0]"  it works:


I also wonder why when I remove the event.preventDefault() function it runs once when I open the page even if I don't click at the button.


Link to comment
Share on other sites

You cannot pass values to addEventListener callbacks. Callbacks have to be just the name of the function without parentheses. If you use parenthesis, you will call the function immediately and assign its return value as an event listener instead.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Create New...