javascript, Label sum

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javascript, Label sum

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#1 by (4 votes)

3

I have in a table, several label ex:

<td style="width:10%"><label id="PrecoProd_3" class="negrito">R$ 1.502,25</label></td>

There are several rows with this type, just changing the id

I would like to place a% of% of the total sum in a certain place on the page

I could do in jquery, pure javascript, any way, but I have not been able to isolate the fields, since I do not know the IDs (it may have multiple rows, so I can not reference the label id

I tried to do so

 function id(el) {
        return document.getElementById(el);
    }
    function somaLabel() {
        //Produtos - é o ID da tabela,
        var inputs = id('Produtos').getElementsByTagName('label');

        var soma = 0;
        for (var i = 0; i < inputs.length; i++) {
            soma += parseInt(inputs[i].value);
        }
        alert(soma);
        //id('resultado').value = soma;
    }

or alert is giving NAN alert only for testing, because I tried to do it on the final label. Application example:

link

javascript

asked by anonymous 19.05.2014 / 17:21

1 answer

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score 4 · Accepted Answer

The error is on the line

sum + = parseInt (inputs [i] .value);

The label element does not have the value attribute, the way you are expecting.

For this, you need to get the text of label , which by DOM , is your first child.

So:

soma += parseFloat(inputs[i].firstChild.nodeValue.substr(3).replace(/\./g, "").replace(/,/g, ".")));

The substr is to skip the beginning of your string "R$ "
I used parseFloat because of decimal places
The replace is to remove the thousand separator (% with%) and then replace the decimal separator "." with "," , so "." can work correctly

Furthermore, after reading the fiddle completely, there was an error in the currency conversion function: it was missing to replace the parseFloat generated by the "." method with toFixed , in addition to correcting the regular expression that adds the thousand separator. The full fiddle is here .

The final corrected code of the function in question is shown below:

function formatDinheiro(n, currency) {
    //às vezes n vem como NaN, quando o usuário deixa o campo em branco
    if (isNaN(n))
        n = 0;
    //converte n para string com 2 casas decimais
    var x = (currency + " " + n.toFixed(2).replace(/\./g, ",")).split(","),
        x1 = x[0],
        x2 = ((x.length > 1) ? "," + x[1] : ""),
        rgx = /(\d+)(\d{3})/;
    //acrescenta um separador de milhar a cada 3 dígitos
    while (rgx.test(x1))
        x1 = x1.replace(rgx, '$1' + '.' + '$2');
    return x1 + x2;
}

Another error is that when doing:

var inputs = id ('Products'). getElementsByTagName ('label');

The "," with subtotal is also returned in the array, so its value entered the sum again. The corrected code for this function is shown below:

function somaLabelProduto() {
    var inputs = id("Produto").getElementsByTagName('label');

    var soma = 0;
    for (var i = 0; i < inputs.length; i++) {
        if (inputs[i].id != "sub_total_0")
            soma += parseFloat(inputs[i].firstChild.nodeValue.substr(3).replace(/\./g, "").replace(/,/g, "."));
    }

    document.getElementById('sub_total_0').innerHTML = formatDinheiro(soma, "R$");
}