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JavaScript - Generate Unique Number
Hi,
I am developing a html ordering system that does not use a database but sends the data via email. To differentiate between two orders I would like to generate and add an unique identifier to the email. One approach I have seen is using data object to generate an unique id: Code: function uniqid()
{
var newDate = new Date;
return newDate.getTime();
}
This is not guaranteed to be unique as two people can send their request at the exact same time. One question pops up, the data being generated, is this local or utc time? Also, the number being generated in this situation is quite big and not so easy to differentiate two orders for a human. Ideally I would like to generate a global sequence starting at 1 and incrementing by one for each user that clicks on the order button regardless of timing, timezone etc. Is this possible given the constraints given at the start of the post? Any suggestions are welcome. Similar TutorialsHi i'm trying to make a unique random number function but i''m stuck in an infinite loop here is what ive been trying below. basically i would like the output to be VolvoSaabBMW in a random order and it should NEVER be VolvoVolvoBMW or anything of the likes, each array item can should only be used once basically. Thanks for any help at all! Code: <html>
<body>
<script type="text/javascript">
var mycars = new Array();
mycars[0] = "Saab";
mycars[1] = "Volvo";
mycars[2] = "BMW";
var uniquerand = new Array();
var c = 0;
function randno(arrayname)
{
var i;
var b = 0;
var randomnumber=Math.floor(Math.random()*arrayname.length);
if(c == 1)
{
while (b<1)
{
for (i=0;i<uniquerand.length;i++)
{
if(uniquerand[i] != randomnumber)
{
document.write(mycars[randomnumber]);
uniquerand.push = randomnumber;
b = 1;
}
}
}
}
else
{
randomnumber=Math.floor(Math.random()*arrayname.length);
uniquerand.push = randomnumber;
document.write(mycars[randomnumber]);
c=1;
}
}
randno(mycars);
randno(mycars);
randno(mycars);
</script>
</body>
</html>
I have a function below where every time a question is submitted, it will add a new row in the table with a textbox which allows numbers entry only. My question is that I don't know how to code these features in this function: 1: I want the text box to be between 0 and 100, so if text box contains a number which is above 100, it will automatically change the number to the maximum number which is 100. Does any one know how to code this in my function below in javascript: Code: function insertQuestion(form)
{
var row = document.createElement("tr");
var cell, input;
cell = document.createElement("td");
cell.className = "weight";
input = document.createElement("input");
input.name = "weight_" + qnum;
input.onkeypress = "return isNumberKey(event)";
cell.appendChild(input);
row.appendChild(cell);
}
When I used toFixed() method on a number, I thought that this method round a number to a specified approximation, but I got a surprising result, the number became string! 15.23689 .toFixed ( 2 ) ==> "15.24" So does it convert the number into string? I am trying to figure out how to make a random number I can plug into a script count down from that number at certain times of the day until it reaches 0. I would like it to reset itself at midnight every day. I'm trying to make it work with a script I found on here that resets itself at midnight every day. So instead of it counting down too fast, it would count down to the next number after a randomly generated number of minutes until it reaches 0. But it wouldn't necessarily have to end at 0 at midnight. It could go from 845 to 323 at the end of the day at a slower pace. Is that possible?
I am building a search function for a sermon blog on squarespace. The format url for category search is www.mysite.org/blog?category=... I have drop down menus and a datepicker but need to figure out how to get java to build the url and redirect to it. The output url should look like http://www.mysite.org/sermons?catego...+mybook+mydate. Any help would be greatly appreciated. Here is my java so far. Code: function search() {
var myRootSite = 'www.mysite.org/sermons?category=';
var myNewTitle = document.getElementById('myTextField').value;
var mySpeaker = document.getElementById('mySpeaker').value;
var myService = document.getElementById('myService').value;
var mySeries = document.getElementById('mySeries').value;
var myBook = document.getElementById('myBook').value;
var myDate = document.getElementById('myDate').value;
if (myNewTitle == 0 && mySpeaker == 0 && myService == 0 && mySeries == 0 && myBook == 0 && myDate == 0) {
alert('Please enter some search criteria');
return;
}
var title = document.getElementById('title');
title.innerHTML = mySpeaker;
}
Hi, I am trying to develop a quiz system.Here is a simplified version of my code with lots of modifications made mainly for easier comprehension. Code: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
<script type="text/javascript">
var count=3;
var questions = new Array(3);
for (var i = 1; i <=count; i++)
{
questions[i] = "Question "+String(i);
}
</script>
<script type="text/javascript">
/*
Global "swap" holder
Use value, null, if no layer initially visible
*/
var currlayerId = "question1";
function toglayer(id)
{
if(currlayerId) setDisplay(currlayerId, "none");
if(id)setDisplay(id, "block");
currlayerId = id;
}
function setDisplay(id,value)
{
var elm = document.getElementById(id);
elm.style.display = value;
}
</script>
<style type="text/css" media="screen, print, projection">
.text
{
display:none;
}
</style>
</head>
<body>
<li><a href="#" onclick="toglayer('question1');return false;">Q.1</a></li>
<li><a href="#" onclick="toglayer('question2');return false;">Q.2</a></li>
<li><a href="#" onclick="toglayer('question3');return false;">Q.3</a></li>
<div id="question1" class="text">
<script>document.write(questions[1]);</script>
<br>
</div>
<div id="question2" class="text">
<script>document.write(questions[2]);</script>
</div>
<div id="question3" class="text">
<script>document.write(questions[3]);</script>
</div>
<script>toglayer('question1');</script>
</body>
</html>
When you will run the code,you will find three links Q.1 Q.2 Q.3 These links are basically due to the following code Code: <li><a href="#" onclick="toglayer('question1');return false;">Q.1</a></li>
<li><a href="#" onclick="toglayer('question2');return false;">Q.2</a></li>
<li><a href="#" onclick="toglayer('question3');return false;">Q.3</a></li>
When you click on any of the links,you will see the question associated with it.This is because of the following code Code: <div id="question1" class="text"> <script>document.write(questions[1]);</script> <br> </div> <div id="question2" class="text"> <script>document.write(questions[2]);</script> </div> <div id="question3" class="text"> <script>document.write(questions[3]);</script> </div> -------------------------------------------------------------------------------------- Now,here's the question,how do I put the div layers and their links in a loop.That is,I want it to be something like this Code: (for var i=1;i<=count;i++)
{
<li><a href="#" onclick="toglayer('question[i]');return false;">Q.[i]</a></li>
}
Code: (for var i=1;i<=count;i++)
{
<div id="question[i]" class="text">
<script>document.write(questions[i]);</script>
<br>
</div>
}
The reason why I ask this is,is because the number of questions in the quiz depends on the value of the javascript variable "count".Therefore,if the value of count is 5,the number of questions would be 5,if it is 6 the number of questions will be 6,etc. Thanks Hemant I wrote a java tool for scanning Js code and generating API documentation automatically. Jsdocx Project Website: http://jsdocx.sourceforge.net/ A online example document: http://jsdocx.sourceforge.net/exampl...ocx/index.html If you find bugs or have suggests, contact with me. Hi All, i want to achieve an effect like the following, please help 1. i want to get the current time, possibility no from client computer ( sometimes their time is wrong)? i dont know whether can achieve but if cannot, then never mind, just get from client computer. 2. for example now is 1:25 am, i want to generate dynamically every half an hour timing from 2 am(round up) till for example 11 am something like <select> <option>2:00</option> <option>2:30</option> ................ <option>11:00</option> </select> for me this is a bit complicated, anybody can help me? <option>3:00</option> Hello, I'm a complete javascript beginner so sorry if I'm just being stupid I wanted to know if it's possible for me to add a picture (as in a .png file) to a page by clicking on something which would then make an image appear on the screen (which I would then want to be able to drag and move but I made a different thread for that question) I hope this explanation made sense Thank you for your time Hello, I'm looking to create a web form with various text field to get input from users. Upon enter data to each field, users should have option to genenrate another text field underneath (i.e. a sub criteria of the above field). This is what i have so far, but i cannot get each button to generate the textfield right underneath. Here's my code: <html> <head> <title>test</title> <script> var maxFieldWidth = "500"; function addRow(element, indentFlag) { var elementClassName = element.className; // this is the class name of the button that was clicked var fieldNumber = elementClassName.substr(3, elementClassName.length); // current textfield width, take off the px on the end var fieldWidth = document.getElementById("textfield" + fieldNumber).style.width; fieldWidth = fieldWidth.substr(0, fieldWidth.indexOf("px")); // get the new field number (incremented) var newFieldNumber = ++fieldNumber; // get new field width in case we are indenting var newFieldWidth = fieldWidth; if(indentFlag) newFieldWidth = fieldWidth - (newFieldNumber * 10); var rowContainer = element.parentNode; // get the surrounding div so we can add new elements // create text field var textfield = document.createElement("input"); textfield.type = "text"; textfield.setAttribute("value", "textfield " + newFieldNumber); textfield.id = "textfield" + newFieldNumber; textfield.setAttribute("style","width:" + newFieldWidth + "px; margin-left: " + (maxFieldWidth - newFieldWidth)); // create buttons var button1 = document.createElement("input"); button1.type = "button"; button1.setAttribute("value", "++"); button1.setAttribute("onclick", "addRow(this, false)"); button1.className = "row" + newFieldNumber; var button2 = document.createElement("input"); button2.type = "button"; button2.setAttribute("value", "+"); button2.setAttribute("onclick", "addRow(this, true)"); button2.className = "row" + newFieldNumber; var button3 = document.createElement("input"); button3.type = "button"; button3.setAttribute("value", "-"); button3.className = "row" + newFieldNumber; // add elements to page rowContainer.appendChild(document.createElement("BR")); // add line break rowContainer.appendChild(textfield); rowContainer.appendChild(document.createTextNode(" ")); // add space rowContainer.appendChild(button1); rowContainer.appendChild(document.createTextNode(" ")); // add space rowContainer.appendChild(button2); rowContainer.appendChild(document.createTextNode(" ")); // add space rowContainer.appendChild(button3); } </script> </head> <body> <div id="main-container"> <div> <input type="text" id="textfield1" value="textfield 1" style="width:500px;" /> <input type="button" class="row1" value="++" onclick="addRow(this, false)"> <input type="button" class="row1" value="+" onclick="addRow(this, true)"> <input type="button" class="row1" value="-"> </div> </div> </body> </html> ok so heres where I stand, I don't know too much about javascript. Just enough to get me by. I am a PHP developer, I know how to do this in PHP but the client insists on doing it through javascript. Basically there are 3 different form values that determine the Premium Death Benefit Ratio. This is the formula the client wants: Premium to Death Benefit Ratio % (Created by formula = Annual (Level) Premium Amount (Divided by) Death Benefit Amount (equals a percentage) That percentage multiplied by Life Expectancy The 3 form values in the formula would be Annual Premium Amount (fypremium), Death Benefit Amount (dbp), Life Expectancy (average_le) I was messing around with javascript trying to figure it out and I have gotten no where since I am not used to writing formulas in JS. Anyways here is what I have so far: Code: function calculateLE(inputFieldId1, inputFieldId2, inputFieldId3, outputFieldId){
var DBR;
var input = document.getElementById(inputFieldId).value;
APA = document.getElementById(fypremium).value;
DBA = document.getElementById(dbp).value;
LE = document.getElementById(average_le).value;
formula = document.getElementById(fypremium).value / document.getElementById(dbp).value = formula3;
formula2 = document.getElementById(average_le).value * formula3;
if { APA = "" } {
document.getElementById(outputFieldId).value = "Error getting Annual Premium Amount";
}
else if { DBA = "" } {
document.getElementById(outputFieldId).value = "Error getting Death Benefit Amount";
}
else if { LE = "" } {
document.getElementById(outputFieldId).value = "Error getting Life Expectancy";
}
else {
document.getElementById(outputFieldId).value = formula3;
}
}
Now I honestly have no clue if I am on the right track but what i've found on the net hasnt really pointed me in the right direction Here is the form values. Code: <input type="text" name="fypremium" id="fypremium" onblur="calculateLE('fypremium', 'dbp', 'average_le', 'premium_dbr')">
<input type="text" name="dbp" id="dbp" onblur="calculateLE('fypremium', 'dbp', 'average_le', 'premium_dbr')">
<input type="text" name="average_le" id="average_le" onblur="calculateLE('fypremium', 'dbp', 'average_le', 'premium_dbr')">
In a nut shell the values for the 3 inputs stated above will determine premium_dbr's value. fypremium / dbp = percentage; average_le * percentage = DBR (death benefit ratio); If someone could point me in the right direction to finishing this id be very greatful. Dear Users, I am trying to validate 4 radio groups (YES/NO) and get user to select at least one YES, doesnt matter which one. I am using a Spry Validation from Dreamweaver + the function listed below, but when I use this function the Spry Validation doesnt work, I think so I need to rebuild attached file (please change txt for js) function validate(f) { if(!f.RadioGroup1[0].checked && !f.RadioGroup2[0].checked) { alert('Please select at least one Yes'); return false; } return true; } I think so this is the place inside the Spry file to make a changes but I am ot quite sure how to make it // check isRequired if (this.isRequired && (nochecked == 0 || required != 0)) { this.addClassName(this.element, this.requiredClass); this.addClassName(this.additionalError, this.requiredClass); return false; } this.addClassName(this.element, this.validClass); this.addClassName(this.additionalError, this.validClass); return true; }; Hey All, So to start out, this is my first post on CodingForums! I've only recently started learning web development so I figured it would be a good idea to get involved with some active forums. I am trying to open a random page in a frame, but I am trying to call the Javascript to do so in another frame. I currently have an html page with a frameset which has two frames. One of the frames is a toolbar that sits at the top of the page and it has an image that acts as button. When the user clicks on this image, the bottom frame generates a random page from an array of links I have hardcoded into the Javascript. The bottom frame is just set to google.com as a default because I couldn't really think of anything to put in an html file there. The problem I'm having is when I click on the image to open a random page in the bottom frame, nothing happens. The code for all the files are below. Home.html Code: <head> </head> <frameset rows='44,*' cols="*" frameborder='no'> <frame name="toolbar" noresize="noresize" src="toolbar.htm" marginwidth="5px" marginheight="10px" scrolling="no"> <frame name="main" noresize="noresize" src="http://www.google.com" marginwidth="5px" marginheight="5px" scrolling="auto" > </frameset><noframes></noframes> <body> </body> </html> The code for the frame, toolbar.htm: Code: <head>
<title></title>
<script type="text/JavaScript" src="random.js"></script>
</head>
<body>
<div id="wrapper">
<div id="toolbar">
<a href="javascript:getaPage()"><img src="Images/nextpage.png" align="right" /></a>
</div>
</div>
</body>
</html>
And finally the Javascript, random.js: Code: function get_random()
{
var ranNum= Math.floor(Math.random()*3);
return ranNum;
}
function getaPage()
{
var randomPage=get_random();
var page=new Array(3)
Page[0]="http://www.google.com";
Page[1]="http://www.yahoo.com";
Page[2]="http://www.myspace.com";
top.main.location.href=page[randomPage];
}
And as a follow-up question, how difficult would it be to set up this entire random page generating script via php? I'm learning php so I can eventually set up a database of urls in mysql and have tags associated with each url. Thanks in advance! I have a script where I move randomly users from one multiple selectfield to another and that part works perfectly, but... When I want to submit the form I don't get any users passed along, course they are not "selected". I have then read around on the net and I need to create an elemet with a hidden input field where all the randomly selected users is inserted to with comma separation, but dont know how?!?! This is what I got: Code: function randomusers(){
var given = 3, used = {}, randnum, opts = $('#select1 option'), olen = opts.length;
function ran() { // generate a unique random number
randnum = Math.floor(Math.random() * olen);
return used['u'+randnum] ? ran() : randnum;
}
for (var i = 0; i < given; i++) { // get the correct quantity of randoms
used['u'+ran()] = true;
}
opts.filter(function(index) { // remove all options that are not one of the randoms
return !!used['u'+index];
}).appendTo('#select2');
}
I have tryied to insert this: appendTo('#select2' + '<input type="hidden" name="test[]" value="" />'); but that didn't seem right... Please help :-) Hi, I have a problem. please help me in this regard. I have a combobox which contain numeric values from 1-7. i want to generate a table with 2 rows and 4 columns through javascript. Means when a user select numeric value like '3' from a combo box then a page generates '3' tables without refreshing a page. And if a user selects '4' from a combobox then a script generates 4 tables with 2 rows and 4 columns and so on. kindly guide me that how can i mkae this javascript. plz help I would like to remove some hosting imposed google ads on my phpbb board. Currently I accomplish this by deleting via javascript all the banners divs when the page is loaded. But unfortunately in that way advertisements are quickly displayed before disappearing. Now I am thinking about a different (neater) approach to my problem: maybe I might write some javascript code which interferes with the one injected by google thus generating the inability to show those annoying divs... Any idea? Hello HTML CODE TUTORIAL support, I am aryan. A student of engg. I want simple help in following code : It is simple 4 You and difficult 4 Me :unsu ================================================ <html> <head></head> <title>Mad </title> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>MAD</title> <script language="javascript" type="text/javascript"> function session() { var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz"; var str = ''; for (var i=0; i<10; i++) { var b = Math.floor(Math.random() * chars.length); str += chars.substring(b,b+1); } document.frm.un.value = str; document.frm.s.value = str; document.frm.capt.src =" Free games - MAD.com init?w=120&h=40&f=png&s="+ str; document.getElementById("c").focus(); } </script> </head> <body> <form action='http://mad.com/ register' method='post' id='cI' enctype='text/plain'><p><input name='s' id='s' value='GENERATED 10 CHARACTERS HERE'' type='hidden'><p><input name='did' id='did' value='NEHA' type='hidden'><p><input name='pid' id='pid' value='twinkle' type='hidden'><p><input name='cid' id='cid' value='twinkle' type='hidden'><p><input name='l' id='l' value='en' type='hidden'> <p> <b>USERNAME</b><br> <input name='un' id='un' value='aliya_loves7' ><p><b>PASSWORD</b><br> <input name='pw' id='pw' value='Iaminhell8*'></p><p> <img src='http://mad.com/init? w=120&h=40&f=png&s=GENERATED 10 CHARACTERS HERE'></p><p> captcha <br><input name='c' id='c'><br><br><input name='send' value=' CREATE ' type='submit'></ form></font> </head> ================================================== In this code i wrote code in italic font. Which is modified by me And i want to know it is wrong or right ? I want to know exact what is wrong here. I tried many times but getting error. And i also want to know When i click on CREATE button, <img src='http://mad.com/init? w=120&h=40&f=png&s="GENERATED 10 CHARACTERS HERE> This value want to change automatically for next session But dont open next page i want to change this in that page likes Refresh Captcha when i press CREATE button One more thing I Have Four input Value ABHI,AKKI,SIMRAN,PRINCE I want to replace this value into NEHA input value. [You can see in code] I also want to change this value when Img src refreshed Please Help me i have a function to dynamically create an image on the screen the problem is i need it to slide down the screen, and i am using the function to have the picture up in more than one place at more then one one time. is their anything i can build into the div tag containing the image that would let it scroll down on its own (or some other method of accomplishing this i haven't thought of) i am putting my function below Code: function newtree(){
x_axis=Math.floor(Math.random()*height);
newdiv=document.createElement('div');
newdiv.setAttribute('style','position:absolute; left:'+x_axis+';top:0');
document.body.appendChild(newdiv);
newimg=document.createElement('img');
newimg.src="Tree.png";
newimg.width="150";
newdiv.appendChild(newimg);
}
the 'height' and 'width' variable are already set to the available room in pixels |
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