Algorithm - How to catch days in a JS week

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Algorithm - How to catch days in a JS week

Asked 8 years, 7 months ago

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I have the following situation: I need to set the days of each week within a month, creating an array of JSON objects.

Each position would correspond to a week, for example if there were 5 weeks I would have an array of 5 positions, where each position would be an object where the day of the week would be the key, and the day of the month the value of this key.

example:

0: {segunda:02/05, terça: 03/05 ...}
1: {...quinta:n/n, sexta:n/n}

I tried to do this using the date object Date but I couldn’t, how could I create this algorithm?

Your month would be the current or some set?

– Marconi

2016/05/12 at 14:19
would be the current month @Marconi

– Marcos Henrique

2016/05/12 at 14:19
1

And how Monday should appear if it still belongs to the previous month?

– Sergio

2016/05/12 at 14:35
1

Apart from your question here, but related you can take a look to this project on Github, it generates something similar to what you’re looking for.

– Sergio

2016/05/12 at 14:36
i ended up mistaking the example and changing the month, but if the month did not have a second should not be set in this application where it encompasses only the current month.

– Marcos Henrique

2016/05/12 at 14:42
as for the project, the same would generate for me objects to set in a date Picker for example?

– Marcos Henrique

2016/05/12 at 14:43
@Marcoshenrique, exactly, I did this project to engine a calendar. jsFiddle: http://jsfiddle.net/La7cwne8/

– Sergio

2016/05/12 at 14:43
@Marcoshenrique in relation to the question: the array starts with the 1st of each month or the Monday of the first week of the month?

– Sergio

2016/05/12 at 14:45
then in relation to the array, it should be set from the first day of the month regardless of the day of the week it started

– Marcos Henrique

2016/05/12 at 14:46

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by Sergio • **133,294** points · Answer 1 · 2016-05-12T15:32:11+00:00

As I suggested in the comments take a look at this project js-Calendar (demo), because I think it does a lot of what you need. It’s a date generator with weekdays, etc.

But to answer the specific question, you can do it this way:

var diasSemana = ['Segunda', 'Terça', 'Quarta', 'Quinta', 'Sexta', 'Sabado', 'Domingo'];

function diaSemana(nr) {
    return diasSemana[nr % 7]; // dar nomes ao numero do dia de semana
}

function diasMes(ano, mes) {
    var semanas = []; // array a preencher
    var semana = {};
    var diaUm = new Date(ano, mes - 1); // dia um do mês
    var inicioSemana = diaUm.getDay() - 1; // numero do dia da semana (começando na segunda)
    var ultimoDia = new Date(ano, mes, -1).getDate(); // quantidade de dias no mês
    for (var i = 1; i <= ultimoDia; i++) {
        var dia = diaSemana(inicioSemana++); // dar nome ao dia da semana
        semana[dia] = [i, mes].join('/'); // dia do mês / mês
        if (i % 7 == 0) { // caso mude a semana
            semanas.push(semana);
            semana = {}
        } else {
            if (i == ultimoDia) semanas.push(semana); // juntar os ultimos dias
        }
    }
    return semanas;
}

var janeiro = diasMes(2016, 1);
alert(JSON.stringify(janeiro, null, 4));

jsFiddle: https://jsfiddle.net/898thd7e/1

I made this code now, test to see if there’s a hidden bug.