CODEWITHSUNDEEP
javascript
Antonio Tito
Antonio Tito

Reputation: 17

shuffle only 5 of 20 random items of an html list (see the code)

good morning and thanks in advance to the whole community for this magnificent support. Who can help me to improveI a function to this code to return only 5 elements randomly from the entire list of 20 elements. I enter the code that now shows randomly the entire list. Thanks to the whole community...

var list = document.getElementById("items"),
newlist = document.getElementById("shuffle");
function shuffle(items)
{
    var cached = items.slice(0), temp, i = cached.length, rand;
    while(--i)
    {
        rand = Math.floor(i * Math.random());
        temp = cached[rand];
        cached[rand] = cached[i];
        cached[i] = temp;
    }
    return cached;
}
function shuffleNodes()
{
    var nodes = list.children, i = 0;
    nodes = Array.prototype.slice.call(nodes);
    nodes = shuffle(nodes);
    while(i < nodes.length)
    {
        list.appendChild(nodes[i]);
        ++i;
    }
}
window.onload = shuffleNodes;
<form id="something">
<div class="classname">
    
<dl id="items">
    <dd>1. item.<br></dd>
    <dd>2. item.<br></dd>
    <dd>3. item.<br></dd>
    <dd>4. item.<br></dd>
    <dd>5. item.<br></dd>
    <dd>6. item.<br></dd>
    <dd>7. item.<br></dd>
    <dd>8. item.<br></dd>
    <dd>9. item.<br></dd>
    <dd>10. item.<br></dd>
    <dd>11. item.<br></dd>
    <dd>12. item.<br></dd>
    <dd>13. item.<br></dd>
    <dd>14. item.<br></dd>
    <dd>15. item.<br></dd>
    <dd>16. item.<br></dd>
    <dd>17. item.<br></dd>
    <dd>18. item.<br></dd>
    <dd>19. item.<br></dd>
    <dd>20. item.<br></dd>
</dl>

</div>
</form>

Upvotes: 0

Views: 59

Answers (2)

Antonio Tito
Antonio Tito

Reputation: 17

Good Morning, and thanks for the code! could you give me one last help? I'm trying but I can not divide this list (total 20 items); select random elements; Mix: 2 elements (between 0.10) and 2 elements (between 10.20) and show everything randomly when the page loads... in the snipped the list is divided (between 0 and 10) and the first 2 elements are selected....

var list = document.getElementById("items"),
newlist = document.getElementById("shuffle");
function shuffle(items)
{
    var cached = items.slice(0,10), temp, i = cached.length, rand;
    while(--i)
    {
        rand = Math.floor(i * Math.random());
        temp = cached[rand];
        cached[rand] = cached[i];
        cached[i] = temp;
    }
    return cached;
}
function shuffleNodes()
{
    var nodes = list.children, i = 0;
    nodes = Array.prototype.slice.call(nodes);
    nodes = shuffle(nodes);
    
    list.innerHTML = "";
  
    while(i < 2)
    {
        list.appendChild(nodes[i]);
        ++i;
    }
}
window.onload = shuffleNodes;
<form id="something">
<div class="classname">
    
<dl id="items">
    <dd>1. item.<br></dd>
    <dd>2. item.<br></dd>
    <dd>3. item.<br></dd>
    <dd>4. item.<br></dd>
    <dd>5. item.<br></dd>
    <dd>6. item.<br></dd>
    <dd>7. item.<br></dd>
    <dd>8. item.<br></dd>
    <dd>9. item.<br></dd>
    <dd>10. item.<br></dd>
    <dd>11. item.<br></dd>
    <dd>12. item.<br></dd>
    <dd>13. item.<br></dd>
    <dd>14. item.<br></dd>
    <dd>15. item.<br></dd>
    <dd>16. item.<br></dd>
    <dd>17. item.<br></dd>
    <dd>18. item.<br></dd>
    <dd>19. item.<br></dd>
    <dd>20. item.<br></dd>
</dl>

</div>
</form>

Upvotes: 0

Blady214
Blady214

Reputation: 739

If you want to stay only 5 shuffled elements on the screen you should modify your shuffleNodes() by clearing the list and adding 5 elements in while loop as follows:

function shuffleNodes()
{
    var nodes = list.children, i = 0;
    nodes = Array.prototype.slice.call(nodes);
    nodes = shuffle(nodes);
    
    list.innerHTML = "";
  
    while(i < 5)
    {
        list.appendChild(nodes[i]);
        ++i;
    }
}

Upvotes: 1

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