Continuously loop through JavaScript text array onclick

Question

I have a text array. I want to display the first entry on page load. And then replace the text with the next entry when I click a button. If I keep clicking the button I want the text to continuously be replaced by waht is next in the array, and when it gets to the end start back at the first entry. Can someone please show me an example code for that. I am new to this.

Here's what I have

$(document).ready(function(){
  var arr = new Array("One","Two","Three");
  var len=arr.length;
  $('#next').click(function(){ 
    for(var i=0; i<len; i++) { 
      $('#quote').html(arr[i]); 
    } 
 });
});

This is about the closest I can get. $(document).ready(function(){ var arr = new Array("One","Two","Three"); var len=arr.length; $('#next').click(function(){ for(var i=0; i<len; i++) { $('#quote').html(arr[i]); } }); }); — Staysee
– Staysee, Commented Oct 20, 2011 at 23:43

RobG · Accepted Answer · 2011-10-21 01:54:45Z

4

Something like the following should do the trick:

<script type="text/javascript">
var nextWord = (function() {
  var wordArray = ['fe','fi','fo','fum'];
  var count = -1;
  return function() {
    return wordArray[++count % wordArray.length];
  }
}());

</script>

<p id="foo">&nbsp;</p>

<button onclick="
  document.getElementById('foo').innerHTML = nextWord();
">Update</button>

Edit

Radomised version:

var nextWord = (function() {
  var wordArray = ['fe','fi','fo','fum'];
  var copy;
  return function() {
    if (!copy || !copy.length) copy = wordArray.slice();
    return copy.splice(Math.random() * copy.length | 0, 1);
  }
}());

edited Oct 21, 2011 at 1:54

answered Oct 21, 2011 at 0:07

RobG

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3 Comments

Staysee Over a year ago

Is it possible to do it at random without repeat, unless you have seen everything?

RobG Over a year ago

Yes. Copy the array, use Math.random()*copy.length|0 to splice a member from the copy. When it's length is zero, make a new copy and start again. However, when the array is re-built the last word of the previous copy might be the first one selected from the new copy. The more words in the array, the less likely that is to happen. You could also remove the last word from the new copy so it can't repeat, but that will make the result less random.

Staysee Over a year ago

Thanks everyone. This has been a real life safer. Seems so simple once you see how it is done!

Ruan Mendes · Accepted Answer · 2011-10-21 00:10:22Z

3

The following should do it http://jsfiddle.net/mendesjuan/9jERn/1

$(document).ready(function(){
  var arr = ["One","Two","Three"];
  var index = 0;
  $('#next').click(function(){ 
    $('#quote').html(arr[index]); 
    index = (index + 1) % arr.length ;
 });
});

Your code was writing all three values each time you clicked it (but only displaying that last value)

edited Oct 21, 2011 at 0:10

answered Oct 20, 2011 at 23:51

Ruan Mendes

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2 Comments

Staysee Over a year ago

Thanks a lot for the reply. When I get to "Three" though, can I click again and have it reset back to "One" and start over?

Akashxolotl Over a year ago

Thanks works like a charm nice work on modulo. Resets back on 0 when reaches array max length.

Terhands · Accepted Answer · 2011-10-20 23:46:40Z

2

I think something like this would work

The javascript would look like:

// assuming maxTextArrayIndex & textArray are defined & populated
var textDisplayIndex = -1;
document.getElementById('textDisplay').innerHTML = textArray[textDisplayIndex];

function nextElement()
{
    textDisplayIndex += 1;
    if (textDisplayIndex > maxTextArrayIndex)
    {
        textDisplayIndex = 0;
    }

    document.getElementById('textDisplay').innerHTML = textArray[textDisplayIndex];
}

The html would look like:

<body onLoad=nextElement()>
...
<elementToDisplayText id=textDisplay></elementToDisplayText>
<button onClick=nextElement()>Next</button>

answered Oct 20, 2011 at 23:46

Terhands

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1 Comment

Ruan Mendes Over a year ago

This works, but you didn't have to completely change the OP's code

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