Compare two numbers and get the largest

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Compare two numbers and get the largest

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#1 by (5 votes)
#2 by (1 votes)
#3 by (0 votes)

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Hello everyone, I'm creating this script to check the largest number and apply it as a discount, but I'm having trouble identifying the number greater and make the calculation.

The question is how to get the values with the comma and return the highest value.

$('.item').each(function() {
	var item = $(this);
	var flag = item.find('.flag');
	var value;
	
    //ESTE IF VERIFICA SE TEM MAIS DE 1 FLAG 
    //QUERO RETORNAR O NUMERO MAIOR COM PONTO OU VIRGULA ENTRE AS 2 FLAGS
	if(flag.length > 1){
        flag.each(function() {
            value = $(this).text().replace(/[^0-9]/g, '');
            console.log(value);
        });
    };
});

*{margin:0;padding:0;list-style:none;font-family:sans-serif;box-sizing:border-box}
ul{display:flex;justify-content:space-around}
.item{padding:10px;width:30%;float:left;border:1px solid #000}
.flag,.console-log{margin:5px 0;padding:5px 0;color:#FFF;text-align:center;background-color:#1485D3}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><ul><liclass="item">
        <p class="flag 1897----promo-comprador">18,97% - Promo Comprador</p>
        <p class="flag 8131----desconto-no-boleto">8,131% - Desconto no Boleto</p>
        <p id="" class="console-log"></p>
    </li>

    <li class="item">
        <p class="flag 1897----promo-comprador">18,97% - Promo Comprador</p>
        <p class="flag 8131----desconto-no-boleto">8,131% - Desconto no Boleto</p>
        <p id="" class="console-log"></p>
    </li>

    <li class="item">
        <p class="flag 1897----promo-comprador">18,97% - Promo Comprador</p>
        <p class="flag 8131----desconto-no-boleto">8,131% - Desconto no Boleto</p>
        <p id="" class="console-log"></p>
    </li>
</ul>

javascript jquery

asked by anonymous 30.06.2016 / 19:07

3 answers

How to exchange values of two variables without using a third one in php Error in POSTGRESQL Bank Creation

score 5 · Answer 1

You must include . and , your regular expression, then transform your string to a valid decimal.

// lista de textos que contem um valor decimal.
var textos = [
  "18,97% - Promo Comprador",
  "8,131% - Desconto no Boleto"
];

// extraindo os valores com ponto flutuante dos textos.
var valores = textos.map(function (texto, indice) {
  return texto.replace(/[^0-9,]/g, '').replace(",", ".");
});

// obtendo o maior valor dentro do array.
var maior = Math.max(...valores);

console.log(maior);

score 1 · Answer 2

You can change the regex to make the search easier, and then change the , to . (because the parseFloat method works in the en-US pattern):

$('.item').each(function() {
    var greaterValue = -99999, greaterFlag = null;
	
    $(this).find('.flag').each(function() {
        var textValue = $(this).text().replace(/^([0-9]+)\,([0-9]+)\%.*$/, '$1.$2');
        var numericValue = parseFloat(textValue);

        if(!isNaN(numericValue) && numericValue > greaterValue) {
            greaterValue = numericValue;
            greaterFlag = $(this); // pega a tag <p/> atual
        }
    });

    console.log('greater value: ' + greaterValue + ' | greater flag tag: ' + greaterFlag.text());
});

*{margin:0;padding:0;list-style:none;font-family:sans-serif;box-sizing:border-box}
ul{display:flex;justify-content:space-around}
.item{padding:10px;width:30%;float:left;border:1px solid #000}
.flag,.console-log{margin:5px 0;padding:5px 0;color:#FFF;text-align:center;background-color:#1485D3}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><ul><liclass="item">
        <p class="flag 1897----promo-comprador">18,97% - Promo 1 Comprador</p>
        <p class="flag 8131----desconto-no-boleto">8,131% - Desconto 1 no Boleto</p>
        <p id="" class="console-log"></p>
    </li>

    <li class="item">
        <p class="flag 1897----promo-comprador">1,24% - Promo 2 Comprador</p>
        <p class="flag 8131----desconto-no-boleto">89,131% - Desconto 2 no Boleto</p>
        <p id="" class="console-log"></p>
    </li>

    <li class="item">
        <p class="flag 1897----promo-comprador">11,9737% - Promo 3 Comprador</p>
        <p class="flag 8131----desconto-no-boleto">2,00% - Desconto 3 no Boleto</p>
        <p id="" class="console-log"></p>
    </li>
</ul>

score 0 · Answer 3

Use Math.max.apply to compare numbers. To resolve the comparison, try to rely on this specific code:

$('.item').each(function() {

    var item = $(this);
    var flag = item.find('.flag');

    /* Array com números das flags do item */
    var numbers = [];

    /* Percorre sobre cada flag */
    flag.each(function(f) {

        // Tira o número da flag da string e adiciona para a array;
        numbers.push(
            parseFloat($(f).text().replace('.', ','))
        );

    });

    // Pega o número máximo na array
    var max = Math.max.apply(null, numbers);

    // Loga o número máximo no console do navegador
    console.log(max);

});