How do I round up a value from 39.54 to 39

Question

How to round the value from within a class in the case 39,54 % OFF for 39 % OFF, values are generated by the system?

Answer 1

Assuming you have a string with the number inside you can use it like this:

(I took several steps just to be clear)

var string = '39,54 % OFF';
var novaString = string.split('%'); // aqui fica com uma duas partes: ["39,24 ", " OFF"]
var arredondamento = parseInt(novaString[0], 10); // aqui converte a primeira parte para numero inteiro, arredondando-o para baixo
var resultado = arredondamento + '%' + novaString[1]; // aqui junta as duas partes novamente
alert(resultado);

Example

In case you have the number in a variable (which does not seem to have a comma) you can use the Math.floor().

If you are changing text in DOM, here is a concrete example using the above code in a function that takes all elements and changes the text:

function limparClasse(classe) {
    var elementos = document.querySelectorAll('.' + classe);
    for (var i = 0; i < elementos.length; i++) {
        var elemento = elementos[i];
        var string = elemento.innerHTML;
        var novaString = string.split('%');
        var arredondamento = parseInt(novaString[0], 10);
        var resultado = arredondamento + '%' + novaString[1];
        elemento.innerHTML = resultado;
    }
}


limparClasse('vtex-cpShow'); // correr a função procurando a classe 'vtex-cpShow'

Example

---

If you use regular expressions you can make the code smaller and use it like this:

function limparClasse(classe) {
    var elementos = document.querySelectorAll('.' + classe);
    for (var i = 0; i < elementos.length; i++) 
        elementos[i].innerHTML = elementos[i].innerHTML.replace(/,.*%/, "%");
}

Example

Answer 2

information about the types of data you are dealing with is missing, but let’s see what we can do:

If its numeric value is of type Float only one parseInt(39.54) must solve. If it is a string, "39,54 % OFF", something like

"39,54 % OFF".replace(/,[^%]+/, "")

will solve your problem.

Regular expression looks for a comma followed by 1 or more characters other than '%' and replaces with an empty string.

Answer 3

Just truncate the value:

 function trunc (n) {
    return ~~n;
 }

Source: https://stackoverflow.com/questions/2125715/javascript-trunc-function