Loop run every 20 lines

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5

I would like every button click to count, and it would invoke variavel to change the initialization and condition > for , for a numeric value of 20 in 20 .

It would be kind to go from 0 to 20 and wait another click. On another click, continue from 20 to 40 and wait for the next click, which will now 40 to 60 > and stop again, and so on ...

That is, the Tie for is only changed at initialization and its condition

for initialization; condition; increment)   ... }

Demo:

In first click

for 20 ; 40 ; increment)   ... }

In the second click

for 40 ; 60   ... }

Third-click

for 60 ; 80   ... }

and so on, with every click.

  

Explaining - Where 0 is 20 after first click , where > 20 becomes 40 after the second click , and so goes to each click on the button, successively one after another click on the button your values.

     

I think it was clear. Dynamic change in loop syntax with every click.

    
asked by anonymous 05.05.2016 / 17:12

4 answers

4

If I understood your question, simply create a variable with a larger scopo to be your "counter" of clicks, applying the rule in lool with each click. Here is a simple example: 

<p id="resultado">

</p>

<script>	
  var contador = 0;
  var test =  document.getElementById("resultado").innerHTML;
  
  function calcular(){
  	console.log(contador);
    var i = 10 + contador;
    var c = 20 + contador;

     for ( i; i < c; i++) {
     console.log(i)
        test += ' - ' + i;
    }
    document.getElementById("resultado").innerHTML = test;
    contador += 10;
  }
</script>

<button onclick="calcular()">
Calcular
</button>
    
05.05.2016 / 18:39
2

the fromInclusive (initialization) and the toExclusive (condition) must come from somewhere. for example, two text boxes.: 

var fromInclusive = document.getElementById("fromInclusive");
var toExclusive = document.getElementById("toExclusive");
var executar = document.getElementById("executar");
var resultado = document.getElementById("resultado");


executar.addEventListener("click", function (event) {
  var from = parseInt(fromInclusive.value);
  var to = parseInt(toExclusive.value);
  var result = 0;
  
  for (var indice = from; indice < to; indice++) {
    result += indice;
  }
  
  resultado.textContent = result;
  
  var diff = to - from;
  fromInclusive.value = from + diff;
  toExclusive.value = to + diff;
});
<div>
  <label>
    fromInclusive:
    <input id="fromInclusive" type="text" value="0" />
  </label>
</div>
<div>
  <label>
    toExclusive:
    <input id="toExclusive" type="text" value="10" />
  </label>
</div>
<div>
  <input id="executar" type="button" value="Somar Valores" />
  <span id="resultado"></span>
</div>
    
05.05.2016 / 18:33
1

Simple like this: 

for (var i = 0; i < 100; i+=10) 
{
    // ...
}

The ++ fault incrementer can be parameterized.

  • % with% increase 1 ;
  • % with n increment , where n should > = 1;

It can also be a decrementer:

  • % with% decrease of 1 ;
  • % with% decrease in n , where n > = 1;
05.05.2016 / 18:27
1

After a few attempts based on the answers from colleagues here, I had a clear vision, just set two variables with a scopo to be initialization and another to condition , the " click counter " the part Let's look at the result, just below: 

var n = 0; // Variável de Inicialização do laço  
        var i = 0; // Variável de Condição do laço  
        var j = 0; // Esta é variável que tão somente conta os cliques no botão

        function mais() {

            // Logo no primeiro clique inicia-se o Salto de 20 em 20 na declaração 2 - condição 
            i += 20;

            // Exibi o(s) número(s) de clique(s) dado(s)
            document.getElementById('view').textContent = i;
            // Nesta linha iremos quebrar/dividir o(s) dado(s) de cada string
            barra = dados.split("|");

            for (x = n; x < i; x++) {
                if (barra[x]) {

                    // Logo abaixo exibimos a informação na página de cada string

                    document.getElementById('list').innerHTML += "<br>" + barra[x] + "<br>";
                }
            }
            // No segundo clique inicia-se o Salto de 20 em 20 na declaração 1 - inicialização 
            // Isto se faz necessário para que não repita as primeiras linhas exibidas 
            // mas que de continuidade nas seguintes após as primeiras e assim por diante ...
            if (j) {
                n += 20
            }
        }
        dados = //Isto é a nosso banco de dados para o nosso exemplo

            // O 1º clique - Mostra a listagem 1 do A - E 
            "|A|Tam.: G|Cod.: 01|" +
            "|B|Tam.: M|Cod.: 02|" +
            "|C|Tam.: P|Cod.: 03|" +
            "|D|Tam.: P|Cod.: 04|" +
            "|E|Tam.: G|Cod.: 05|" +
            // O 2º clique - Mostra a listagem 2 do F - J 
            "|F|Tam.: P|Cod.: 06|" +
            "|G|Tam.: M|Cod.: 07|" +
            "|H|Tam.: P|Cod.: 08|" +
            "|I|Tam.: P|Cod.: 09|" +
            "|J|Tam.: G|Cod.: 10|" +
            // O 3º clique - Mostra a listagem 3 do K - O 
            "|K|Tam.: G|Cod.: 11|" +
            "|L|Tam.: M|Cod.: 12|" +
            "|M|Tam.: P|Cod.: 13|" +
            "|N|Tam.: P|Cod.: 14|" +
            "|O|Tam.: G|Cod.: 15|" +
            // O 4º clique - Mostra a listagem 4 do P - T 
            "|P|Tam.: G|Cod.: 16|" +
            "|Q|Tam.: M|Cod.: 17|" +
            "|R|Tam.: P|Cod.: 18|" +
            "|S|Tam.: P|Cod.: 19|" +
            "|T|Tam.: G|Cod.: 20|" +
            // O 5º clique - Mostra a listagem 5 do U - Y
            "|U|Tam.: G|Cod.: 21|" +
            "|V|Tam.: M|Cod.: 22|" +
            "|W|Tam.: P|Cod.: 23|" +
            "|X|Tam.: P|Cod.: 24|" +
            "|Y|Tam.: G|Cod.: 25|";
    <center>

        <input type="button" onclick="mais(j++)" value="Conta">

        <div id="view"></div>

        <hr>

        <div id="list"></div>

    </center>

But why would you have to add / traverse by 20 in 20?

I say! - For my purpose as they can parse I'm looking for data from within a method new String() .

However, I wanted to only display 5 strings per click.

For every data between double quotes, we have the " | " bars, which in turn divides the data, namely: 4 bars by string .

Knowing this, multiply 4 barras by 5 strings = 20 linhas

In this way, the var n=0 , n += 20 and var i=0 , i += 20 are created to change the declaration declaration and the statement declaration for

So we have the 20 in 20 lines

  

NOTE - What I had in mind when I asked this question was to create an infinite sroll effect in Pure Javascript. I realized that I could do it with a loop with the method scrollTop() . It was in this intention that I came to the conclusion that not only would it create the infinite scroll effect with this logic but also make static pagination and randomize the information on the page.

     

Because you could not use the syntax of for as it is itself, you would not have to go through it in sequence (ordinal numbers), of course this is how a loop does. If I did so, with each click on the button it would return only the twentieth (last) line of each string .

    
09.05.2016 / 05:53
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