Select A Random Entry From An Array?
Aug 30, 2010
So, I am attempting to select a random entry from an array, and then make it so that particular entry will not be selected again until every entry has been selected. Basically, I don't want to see any of the same entries, until all of the entries in the array have been selected.
So if this were my array....
keywords =
[
"ppc",
"games",
[Code]....
since meta was selected a second time before everything had been selected once.
I would like to see something more like
meta, advertise, gaming,ppc, welcome, home, games, advertise, ppc, since this did not select any entry multiple times before every entry had been randomly selected.( the second loop started at the second "advertise" in case you didn't catch the differences.
But as you can see from the code that I have posted above, I do not know how to do this. I have seen examples where the entries that were randomly selected, were actually deleted from the array entirely but this is not what I want to do. I just want every entry to be selected once, and then for the process to be restarted.
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Dec 18, 2010
I have an array and a button to select a random integer from the array, how do I make it so that it selects every integer once til all are selected, then it starts over again?For example, an array has these:
A
B
1
2
Q
F
So you press the button a number of times, and you get:
Q
B
1
F
A
2
Instead of:
1
Q
A
1
B
A
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Aug 6, 2009
I've looked for a solution to this issue, but it seems like a little different scenario than other situations. I made a system for generating friend requests on Facebook. I have a grid that is 6 x 3, for a total of 18 cells. Each cell has a picture in it, and the picture is linked to the Facebook friend request page. My problem is that since each cell is populated at random from the array, I'm getting lots of repeats. For example, some picutures are in 5 cells, and some are in none. I'm trying to figure out how to make it so that once a picture is used once in the grid, it does not get used again in the same grid.I still want every cell filled at random on each page load, I just want to prevent the repeating.
Here's my current code:
<script type="text/javascript">
var vip_list=new Array(
new Array('http://profile.ak.fbcdn.net/v225/1616/88/s1220771654_2158.jpg','http://www.facebook.com/addfriend.php?id=1220771654'),
new Array('http://profile.ak.fbcdn.net/v223/1233/29/s904885342_9055.jpg','http://www.facebook.com/addfriend.php?id=904885342'),
[Code]...
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Feb 27, 2009
I have a value, j[i] , which Ineed to do the following with:1) split with / to make an array2) Return the last valueFor example:Continent/country/State/City..and it would return "City", and with:Continent/country/State..it would return "State"Can anyone point me in the right direction?In Perl, I would just do:
my @tmp = split ///, $val;
my $last_val = $tmp[$#tmp];
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Mar 24, 2006
I'm refering to an entry in an array by it's string key, as in
foo["bar"]. Is there a way to get the numeric index of that array
without iterating through the entire array?
What I need to do is find the "next" or "previous" entry in the array,
but the keys are strings, instead of numerical indeces.
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Oct 29, 2009
I created an array, whose entries looks like this:
[41, "The bird flew into it's cage"]
[33, "He drew fire from Joe"]
[33, "Roger asked her her name"]
[code]....
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Mar 9, 2010
How do I search through an array looking for an inputted entry? Ihave this so far. Also need it to display where the object was found.
var states = new Array();
var i;
i=0;
states[0] = "Alabama";
states[1] = "Alaska";
states[2] = "Arizona";
states[3] = "Arkansas";
states[4] = "California";
states[5] = "Colorado";
states[6] = "Connecticut";
states[7] = "Delaware";
states[8] = "Florida";
states[9] = "Georgia";
states[10] = "Hawaii";
states[11] = "Idaho";
states[12] = "Illinois";
states[13] = "Indiana";
states[14] = "Iowa";
states[15] = "Kansas";
states[16] = "Kentucky";
states[17] = "Louisiana";
states[18] = "Maine";
states[19] = "Maryland";
states[20] = "Massachusetts";
states[21] = "Michigan";
states[22] = "Minnesota";
states[23] = "Mississippi";
states[24] = "Missouri";
states[25] = "Montana";
states[26] = "Nebraska";
states[27] = "Nevada";
states[28] = "New Hampshire";
states[29] = "New Jersey";
states[30] = "New Mexico";
states[31] = "New York";
states[32] = "North Carolina";
states[33] = "North Dakota";
states[34] = "Ohio";
states[35] = "Oklahoma";
states[36] = "Oregon";
states[37] = "Pennsylvania";
states[38] = "Rhode Island";
states[39] = "South Carolina";
states[40] = "South Dakota";
states[41] = "Tennessee";
states[42] = "Texas";
states[43] = "Utah";
states[44] = "Vermont";
states[45] = "Virginia";
states[46] = "Washington";
states[47] = "West Virginia";
states[48] = "Wisconsin";
states[49] = "Wyoming";
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Mar 16, 2009
I am trying to accomplish a fairly basic task with javascript > my lack of Js knowledge has meant i have hit something of a roadblock.I need the a function to take an array from a form, remove the parsed variable from it and repost the form with the new array.This is what I have so far...
<script language="javascript">
function remove(SID) {
var speakers = document.form_name.elements["SID[]"];
[code]....
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Jul 23, 2005
I have a dropdown box containing about 10 values.
I would like to create a separate href on my page that when clicked will
make the drop down box go to a specific value. I do not want to have to
refresh the page to do this. Is it possible to have that sort of control
over a drop down box.?
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May 6, 2007
I'd like to reorganize the third, fourth, fifth and sixth, as well as any
elements thereafter in an array in random order:
var a = new Array('first','second','third','fourth','fifth','s ixth','etc')
In other words, the first, second and third element should remain in
position 0, 1 and 2, while the fourth, fifth and sixth, etc. should appear
in random order.
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Mar 20, 2010
I am having a problem where I want to give user an option to select more entry from one dropdown.
Example:
<form name="form1" method="post" action="">
<label>
<select name="service" id="service">
<option value="service1">service 1</option>
<option value="service2">service2</option>
<option value="service3">service3</option>
<option value="service4">service 4</option>
<option value="service5">srvice5</option>
<option value="service6">service 6</option>
</select>
</label>
</form>
In this case, I want to select service 3, service 4, service 5 and service 6. I don't know how to create a javascript function for this.
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Aug 10, 2011
I am looking to build as basic as possible, a form that has 3 select dropdowns that have predetermined options. The user will select the first option and based on that option the second will populate and based on that, the third one will give the last option. Now, when the last one is selected, i need a div or a paragraph displaying information to be displayed.So here's the framework.
Option 1 = fruit or vegitables of which fruit is selected is selected by the user
Option 2 = Apples, Grapes, and pears of which apples is then selected
Option 3 = Red, Green and Yellow of which Green is selected.
Once green is selected, I need a description about the green aple to be displayed.
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Aug 1, 2005
I have a textbox on one of my forms that is used to accept a time from the
user. I need to write this value to a database to trigger an event later on.
What I'd like to know is...
Are there any functions in javascript that can convert different time
formats to a known format (24 hour clock)... 5pm -> 17:00 or 5:00 to 05:00,
etc. ???
Assuming that I get the input into a 24 hour format, how can I create a full
time/date variable with todays date and the users entered time?
Finally, if the entered time is earlier than the current time, how can I
create the above date/time combination using tomorrows date?
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Jul 16, 2009
In http:www.dreaminco...wtopic51264.htm a code was proposed for generating a random number within an array and then printing it into the html document using document.write.Is it possible to go one step ahead and feeding the result into an html href function? [code]is the random array member generated by the javascript.
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Dec 7, 2009
I am trying to write a function that will take a random array as a var and split it into two arrays. My problem is I don't know how to show the split. I need to cut the array at the mid index. How do i write that so no matter what the length is the middle of the index is selected. I have wrote some code but the if isnt working and the var to set the two array lengths is not right Code:
[Code]....
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Apr 10, 2010
This one is throwing me off! Either I am making a stupid mistake or I'm doing it totally wrong I have an array, and I am trying to select unique values from it and assign it to another array. Here is the code:
Code:
var flag;
for (i=0;i<=pdfs.length-1;i++)
{
flag = 1;
for (j=0;j<=pdfs2.length-1;j++)
[Code]...
The problem is that the if (pdfs2[j] == pdfs[i]) statement ends up never being true. There are URL's to pdf files in the array. On the other side, if there is a much easier way to select unique values from an array, please feel free to point it out.
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Jun 8, 2009
I have some image URLs stored in an array. I then want to be able to print out one of those image URLs randomly on page load. What would be the best method to do this in jQuery?
[Code]...
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Feb 20, 2010
Code:
<html>
<head>
<script type="text/javascript">
[code]...
how to call the values at random in the arrays: article, noun, verb, preposition ?
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Jan 21, 2009
I am learning Javascript from this book I got, and I am trying to do one of the "challenges" in the Hangman example, and that is to add on more 8 letter words to it and have it select by random. I am assuming that it's asking me to do this with arrays, but I have no idea how to implement that on this while having it select randomly.
<html>
<head>
<title>Hangman</title>
<script language="JavaScript" type="text/javascript">
</script>
</head>
[Code]...
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May 7, 2011
I have an array containing 100 different values. How would I randomly pick 25 of them for display? For now I do: for (var i=0; i<markers.length && i<25; i++) {
html += markers[i].name + '<br />';
}
Which of course returns 25 values but always in the same order which is not what I want. PS. My array could also contain only 20 values, in which case I would like the function to display the 20 values randomly sorted.
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Nov 21, 2000
does anyone know how to scramble the "box#" in the codes below? Ultimately, I want the checkboxes to be in different order each time I access the web page?
<script lanugage="javascript">
function countChoices(obj) {
max = 3; // max. number allowed at a time
box1 = obj.form.box1.checked; // your checkboxes here
box2 = obj.form.box2.checked;
box3 = obj.form.box3.checked; // add more if necessary
box4 = obj.form.box4.checked;
box5 = obj.form.box5.checked;
count = (box1 ? 1 : 0) + (box2 ? 1 : 0) + (box3 ? 1 : 0) + (box4 ? 1 : 0) + (box5 ? 1 : 0);
if (count > max) {
alert("You can only choose " + max + " of the 5 nominees.");
obj.checked = false;
}
}
</script>
<form>
<input type=checkbox name=box1 onClick="countChoices(this)"> Homer Simpsons <p>
<input type=checkbox name=box2 onClick="countChoices(this)"> Ground's Keeper Willie <p>
<input type=checkbox name=box3 onClick="countChoices(this)"> Mr. Burns <p>
<input type=checkbox name=box4 onClick="countChoices(this)"> Barney <p>
<input type=checkbox name=box5 onClick="countChoices(this)"> Chief Wiggum<p>
</form>
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May 15, 2010
I'm creating a tool which will who a random image every time I press a button, when the image is clicked it will open a new tab which will show a website. I can tell you I've succeeded in all this, but I was wondering if there is any way in which I can let my "generator" show 1 standard image at first, and if this is even possible never show that image after it has been showed. The image will explain that the you have to press the button to go to the next image.The Code:
<script language="JavaScript">
images = new Array(4);
images[0] = "<a href = 'URL' target='name' onclick='window.open ('URL')' ><img src='img1.jpg' alt='tag'></a>";
[code]....
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Nov 10, 2010
I have a quick question with multiple array and random numbers. If i generate my random numbers in one array, how would i take a selection of those numbers and put them in another array?
Ex: array 1: 25, 34, 38, 40, 22, 49
Want to move numbers between 30 and 50 to another array.
array 2: 34, 38, 40, 49
Is it as simple as for loops and if statements setting the conditions? do i use a sorting method? (selection? bubble?)
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Sep 5, 2010
My array contains 15 value I want to random pick 5 value:
[Code]...
How to random pick from all elements with no repeat of the same content. e.g. if myArray[0] is picked then myArray[12] will not be picked again. (because they have the same value "a")
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Mar 29, 2010
I am taking a Javascript class and the teacher assigned this: Quote: Write a script that uses a random number generation to create sentences and name it sentences.html. Use five arrays of strings called: uppercase article (uarticle), noun, verb, lowercase article (larticle), and preposition. You will need to use the correct case for the article arrays. Create a sentence by selecting a word at random from each array in the following order: uarticle, noun, verb, preposition, larticle, noun. You can find examples of generating random numbers in both Fig. 8.6 (dice-rolling) and Fig. 8.7 (random image) of Chapter 8.
The arrays should be filled at minimum, as follows: the article array(s) should contain the articles: the, a, one, some and any. The noun array should contain the nouns: boy, girl, dog, town and car. The verb array should contain the verbs: drove, jumped, ran, walked, and skipped. The preposition array should contain the prepositions: to, from, over, under and on. If you would like to add more words, adjust the arrays appropriately.
[Code]...
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Feb 18, 2009
I am working on a problem that wants me to use a for loop to give an array a random number for each of it's elements (total of 10) and then using a second loop to add them up and display the result.
<script type="text/javascript">
var sum;
var i=0;
[code]....
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