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JavaScript - How To Get Rid Of List Number When Using The Unshift Method
So im working on code that user adds things to a list. When you hit the promote button, the user chooses which task to promote to the beginning by way of the unshift method. My problem that I can't figure out is how to get rid of the number to the old task that I promoted. It's like its an empty string. I'm just looking for some ideas to how I might go about solving it. The first code is the html, and the second is the .js.
Code: <body>
<div id="content">
<h1>Task List Manager</h1>
<p id="tasks"><textarea id="task_list" rows="5" cols="50"></textarea></p>
<p><input type="button" name="add_task" id="add_task"
value="Add Task" /></p>
<p><input type="button" name="modify_task" id="modify_task"
value="Modify Task" /></p>
<p><input type="button" name="delete_task" id="delete_task"
value="Delete Task" /></p>
<p><input type="button" name="promote_task" id="promote_task"
value="Promote Task" /></p>
</body>
Code: var task_list = [];
var $ = function (id) { return document.getElementById(id); }
var update_task_list = function () {
if ( task_list.length == 0 ) {
$("task_list").value = "";
} else {
var list = "";
for ( var i in task_list ) {
list += (parseInt(i)+1) + ": " + task_list[i] + "\n";
}
$("task_list").value = list;
}
}
var add_task_click = function () {
$("add_task").blur();
var task = prompt("Enter a task:", "");
if ( task != "" && task != null) {
task_list.push(task);
update_task_list();
}
}
var delete_task_click = function () {
$("delete_task").blur();
if ( task_list.length == 0 ) {
alert("No task to delete.");
return;
}
var to_delete = prompt("Enter the task number to delete:", "");
if (to_delete == null) { return; }
to_delete = parseInt(to_delete);
if ( isNaN(to_delete) ) {
alert("You did not enter a number.");
return;
}
if ( to_delete < 1 ) {
alert("The task number is too low.");
return;
}
if ( to_delete > task_list.length ) {
alert("The task number is too high.");
return;
}
to_delete--;
task_list.shift();
//task_list.splice(to_delete, 1);
update_task_list();
}
var modify_task_click = function() {
var mod = parseInt(prompt("Enter the task number that you choose to modify:", "") );
var wow = parseInt(mod - 1);
var bomb = prompt("Modify your task",task_list[wow]);
task_list[wow] = bomb;
update_task_list();
}
var promote_task_click = function () {
var mud = parseInt(prompt("Enter the task number that you choose to be promoted:", "") );
var mooh = parseInt(mud - 1);
var fat = task_list[mooh];
task_list.unshift(fat);
var cops = parseInt(mooh + 1);
task_list[cops] = "";
update_task_list();
}
window.onload = function() {
$("add_task").onclick = add_task_click;
$("delete_task").onclick = delete_task_click;
$("modify_task").onclick = modify_task_click;
$("promote_task").onclick = promote_task_click;
update_task_list();
}
Similar TutorialsIf i have 4 vars var one = 29.1 var two = 5.4 var three = 12.4 var four = 15 how can compare all 4 and find the smallest? in this case the result would be two Why is the callwhy is the slice method only a method of an Array instance? The reason why I ask is because if you want to use it for the arguments property of function object, or a string, or an object, or a number instance, you are forced to use Array.prototype.slice.call(). And by doing that, you can pass in any type of object instance (Array, Number, String, Object) into it. So why not just default it as a method of all object instances built into the language? In other words, instead of doing this: Code: function Core(){
var obj = {a : 'a', b : 'b'};
var num = 1;
var string = 'aff';
console.log(typeof arguments);//Object
console.log(arguments instanceof Array);//false
var args1 = Array.prototype.slice.call(arguments);
console.log(args1);
var args2 = Array.prototype.slice.call(obj);
console.log(args2);
var args3 = Array.prototype.slice.call(num);
console.log(args3);
var args4 = Array.prototype.slice.call(string);
console.log(args4);
Core('dom','event','ajax');
Why not just be able to do this: Code: function Core(){
var obj = {a : 'a', b : 'b'};
var num = 1;
var string = 'aff';
var args = arguments.slice(0);
var args2 = obj.slice(0);
var args3 = num.slice(0);
var args4 = string.slice(0);
//right now none of the above would work but it's more convenient than using the call alternative.
}
Core('dom','event','ajax');
Why did the designers of the javascript scripting language make this decision? Thanks for response. 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);
}
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?
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? Hi all, I have been struggling on a bit of code for a while now. I need to populate a second drop down list (Region) based upon the selection of the first (County). I have found a piece of code that works on its own and have adapted to suit my needs - see below. However, when I drop it into my main page the javascript is not working. It's because of the formObject but I just don't know enough to resolve this! Furthermore, I need the textboxes the user has already completed in the form to retain their value once the javascript kicks in as the completed form will submit to a database. This piece of code is working well . . . . Code: <?php
$link = mysql_connect('myhost', 'myusername', 'mypassword') or die('Could not connect: ' . mysql_error());
mysql_select_db('mydatabase') or die('Could not select database');
if(isset($_GET["County"]) && is_numeric($_GET["County"]))
{
$County = $_GET["County"];
}
if(isset($_GET["Region"]) && is_numeric($_GET["Region"]))
{
$Region = $_GET["Region"];
}
?>
<script language="JavaScript">
function autoSubmit()
{
var formObject = document.forms['theForm'];
formObject.submit();
}
</script>
<form name="theForm" method="get">
<!-- County SELECTION BASED ON city VALUE -->
<?php
?>
<select name="County" onChange="autoSubmit();">
<option value=''</option>
<?php
//POPULATE DROP DOWN MENU WITH COUNTRIES FROM A GIVEN city
$sql = "SELECT * FROM county_regions";
$counties = mysql_query($sql,$link);
while($row = mysql_fetch_array($counties))
{
echo ("<option value=\"$row[CountyID]\" " . ($County == $row["CountyID"]? " selected" : "") . ">$row[County]</option>");
}
?>
</select>
<?php
?>
<br><br>
<?php
if($County!= null && is_numeric($County))
{
?>
<select name="Region" onChange="autoSubmit();">
<?php
//POPULATE DROP DOWN MENU WITH RegionS FROM A GIVEN city, County
$sql = "SELECT * FROM county_regions WHERE CountyID = $County ";
$Regions = mysql_query($sql,$link);
while($row = mysql_fetch_array($Regions))
{
echo ("<option value=\"$row[CountyID]\" " . ($Region == $row["CountyID"]? " selected" : "") . ">$row[Region]</option>");
}
?>
</select>
<?php
}
?>
What follows is my form where the javascript is not working - edited quite a bit to save on space! Code:
<head>
<script language="JavaScript">
function autoSubmit()
{
var formObject = document.forms['subform'];
formObject.submit();
}
</script>
</head>
<form enctype="multipart/form-data" method="post" action="add_attraction01.php" FORM NAME="FormName">
<input type="hidden" name="MAX_FILE_SIZE" value="32768" />
<label for="Business_name">Business Name</label>
<input type="text" size="60" STYLE="color: #FFFFFF; font-family: Arial, Helvetica, sans-serif; font-weight: bold; font-size: 12px; background-color: #72A4D2;"
<id="Business_name" name="Business_name" maxlength=60/><font size="1" face="arial" color="red">Required field</font><br />
<label for="StreetAddress">Address</label>
<input type="text" size="60" rows="2" id="StreetAddress" name="StreetAddress" maxlength=120/><font size="1" face="arial" color="red">Required field</font><br />
<label for="Town">Town</label> <input type="text" size="25" id="Town" name="Town" maxlength=25/><font size="1" face="arial" color="red">Required field</font><br />
<?php
$link = mysql_connect('myhost', 'myusername', 'mypassword') or die('Could not connect: ' . mysql_error());
mysql_select_db('mydatabase') or die('Could not select database');
if(isset($_GET["County"]) && is_numeric($_GET["County"]))
{
$County = $_GET["County"];
}
if(isset($_GET["Region"]) && is_numeric($_GET["Region"]))
{
$Region = $_GET["Region"];
}
?>
<form name = "subform" method="get">
<select name="County" onChange="autoSubmit();">
<option value=''</option>
<?php
$sql = "SELECT * FROM county_regions";
$counties = mysql_query($sql,$link);
while($row = mysql_fetch_array($counties))
{
echo ("<option value=\"$row[CountyID]\" " . ($County == $row["CountyID"]? " selected" : "") . ">$row[County]</option>");
}
?>
</select>
<?php
?>
<br><br>
<?php
if($County!= null && is_numeric($County))
{
?>
<select name="Region" onChange="autoSubmit();">
<?php
$sql = "SELECT * FROM county_regions WHERE CountyID = $County ";
$Regions = mysql_query($sql,$link);
while($row = mysql_fetch_array($Regions))
{
echo ("<option value=\"$row[CountyID]\" " . ($Region == $row["CountyID"]? " selected" : "") . ">$row[Region]</option>");
}
?>
</select>
<?php
}
?>
<input type="text" size="20"id="Tel_No" name="Tel_No" maxlength=20 onkeypress="return isNumberKey(event)"/><font size="1" face="arial" color="red">Required field</font><br />
<br/>
<input type="submit" value="Submit your attraction" name="submit" onclick="return BothFieldsIdenticalCaseSensitive();"/>
</form>
</body>
</html>
It's probably obvious to you guys!! Thanks in advance for your help. I would like to make an ordered list, for example: 1. Airplane 2. Boat 3. Car I'd like one of the words to be displayed on my webpage, for example: Boat Then I'd want an up button, and a down button. The up button would display Airplane instead of Boat, and the down button would display Car instead of Boat. Once it got to Car, the same up button would change it back to boat. How do I do this? Thanks. 09-01-10 Not sure exactly where to post this thread as it involves HTML, Javascript and embedded media players. It probably would be more appropriate here as there is much Javascript involved.... Hello, I am trying to construct a Jukebox for my website. I have spent considerable time all over the WEB and at this forum which addressed the issue in a 50 page thread. Please see: http://codingforums.com/showthread.php?t=50666 I got a lot of ideas from this thread but still cannot figure a way to do the following within the Jukebox. These are my main two questions for everything below: 1. How can I have the Jukebox cycle through all tunes and then start over from the beginning? 2. How can I allow the user to select a tune from a list but not a drop down list, have the Jukebox start from the user’s selection and then play all songs to the end. Then as in #1, start over from the beginning? Per this thread I came away with basically two ways to assemble the jukebox. One uses links in a drop down list which the user can choose from. The other is to use an .m3u playlist. The user can only select a “playlist” from the drop down. Below, I have included the code for each Jukebox. To see the Jukeboxes in action please go to my website where I have posted some test pages exhibiting the jukeboxes that I am referring to. The following is the Jukebox which utilizes an .m3u playlist. If I end up using this idea I would like the tunes in the .m3u playlist to be displayed and allow the user to be able to choose a tune in the list. Then have the list play to the end of all tunes in the list. Then start over from the beginning of the list. After this code is the .m3u playlist. Go to url removed and click on the link that says: “Media Player Using an .M3U Playlist” Jukebox utilizing an .m3u playlist: Code: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Untitled Document</title>
<style type="text/css">
body {
text-align:center;
}
</style>
<script type="text/javascript">
function PlayIt(what){
player.document.getElementById('music').innerHTML='<object width="300" height="300" '
+'classid="CLSID:6BF52A52-394A-11d3-B153-00C04F79FAA6" '
+'codebase="http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#Version=5,1,52,701" '
+'standby="Loading Microsoft Windows Media Player components..." type="application/x-oleobject">'
+'<param name="url" value="'+what+'">'
+'<param name="uiMode" value="full">'
+'<param name="autoStart" value="true">'
+'<param name="loop" value="true">'
+'<embed type="application/x-mplayer2" '
+'pluginspage="http://microsoft.com/windows/mediaplayer/en/download/" '
+'showcontrols="true" uimode="full" width="300" height="45" '
+'src="'+what+'" autostart="true" loop="true">'
+'</object>';
}
</script>
</head>
<body>
<div id="music">
<object width="300" height="300"
classid="CLSID:6BF52A52-394A-11d3-B153-00C04F79FAA6"
codebase="http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#Version=5,1,52,701"
standby="Loading Microsoft Windows Media Player components..." type="application/x-oleobject">
<param name="url" value="">
<param name="uiMode" value="full">
<param name="autoStart" value="true">
<param name="loop" value="true">
<embed type="application/x-mplayer2"
pluginspage="http://microsoft.com/windows/mediaplayer/en/download/"
showcontrols="true" uimode="full" width="300" height="45"
src="" autostart="true" loop="true">
</object>
</div>
<br>
<br>
<select name="player" onchange="PlayIt(this.value)">
<option value="none">::Choose a Song::</option>
<option value="JukeboxList.m3u">Jukebox List</option>
</select><br>
</html>
Here is the .m3u playlist for the above code: Code: #EXTM3U #EXTINF:Bill Evans - G Waltz media/G Waltz.mp3 #EXTINF:Dan Pincus - In Your Time media/In Your Time.mp3 The following code is for the Jukebox that has a list of links in a dropdown list. If I go with this idea, I would like for the list not to be a dropdown list but just a list of tunes. The user should be able to click on any tune in the list and the player should start from that point, play all the remaining tunes in the list and then start from the beginning. Go to url removed and click on the link that says: “Media Player Using Links” Code: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Untitled Document</title>
<style type="text/css">
body {
text-align:center;
}
</style>
<script type="text/javascript">
function PlayIt(what){
player.document.getElementById('music').innerHTML='<object width="300" height="300" '
+'classid="CLSID:6BF52A52-394A-11d3-B153-00C04F79FAA6" '
+'codebase="http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#Version=5,1,52,701" '
+'standby="Loading Microsoft Windows Media Player components..." type="application/x-oleobject">'
+'<param name="url" value="'+what+'">'
+'<param name="uiMode" value="full">'
+'<param name="autoStart" value="true">'
+'<param name="loop" value="true">'
+'<embed type="application/x-mplayer2" '
+'pluginspage="http://microsoft.com/windows/mediaplayer/en/download/" '
+'showcontrols="true" uimode="full" width="300" height="45" '
+'src="'+what+'" autostart="true" loop="true">'
+'</object>';
}
</script>
</head>
<body>
<select name="player" onchange="PlayIt(this.value)">
<option value="none">::Choose a Song::</option>
<option value="media/GWaltz.mp3">G Waltz</option>
<option value="media/InYourTime.mp3">In Your Time</option>
<option value="http://urltosong3.mp3">Song 3</option>
<option value="http://urltosong4.mp3">Song 4</option>
<option value="http://urltosong5.mp3">Song 5</option>
</select><br>
<div id="music">
<object width="300" height="300"
classid="CLSID:6BF52A52-394A-11d3-B153-00C04F79FAA6"
codebase="http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#Version=5,1,52,701"
standby="Loading Microsoft Windows Media Player components..." type="application/x-oleobject">
<param name="url" value="">
<param name="uiMode" value="full">
<param name="autoStart" value="true">
<param name="loop" value="true">
<embed type="application/x-mplayer2"
pluginspage="http://microsoft.com/windows/mediaplayer/en/download/"
showcontrols="true" uimode="full" width="300" height="45"
src="" autostart="true" loop="true">
</object>
</div>
</html>
Another idea I found on the WEB also uses an .m3u playlist. The good thing about it is that it lists all the tunes in the playlist which the user can then select from. This jukebox calls up an entire Windows Media Player. If I was to use this idea I would like to be able to disable the left side of the player where the user has options such as burning to CD, Media Guide, Radio Tuner etc… Go to url removed and click on the link that says: “Media Player Within an IFrame Using .m3u Playlist”” Code: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>JukeBox</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="Expires" content="-1"> </head> <body> <IFRAME name="frame" src="JukeboxList.m3u" width="100%" height="347" scrolling="no" frameborder="0"> [Your user agent does not support frames or is currently configured not to display frames.] </IFRAME> </body> </html> Thanks! Dan I have two lists/menus that are start and end times and I want to make the end time list/menu advance 2 hours from whatever is chosen in start list/menu. The values in both of the list/menu are [CODE] <select name="Time" class="Body" id="Time"> <option value="">Choose Start Time</option> <option value="06:00:00">6:00 am</option> <option value="06:30:00">6:30 am</option> <option value="07:00:00">7:00 am</option> <option value="07:30:00">7:30 am</option> ETC........ <select name="Time2" class="Body" id="Time2"> <option value="">Choose End Time</option> <option value="06:00:00">6:00 am</option> <option value="06:30:00">6:30 am</option> <option value="07:00:00">7:00 am</option> <option value="07:30:00">7:30 am</option> ETC........ [ICODE] any ideas on how to accomplish this? you can find my file at http://www.crazywayno.com/startend.php ---------------------------------------------------------------- I also tried this javascript but it doesn't add the additional 2 hours it just repeats the first value. [CODE] <script type="text/javascript"> function cfunc() { document.getElementById("Time2").value=document.ge tElementById("Time").value } </script> <select name="Time" type="text" id="Time" onmouseup="cfunc()"> <option value="">Choose Start Time</option> <option value="06:00:00">6:00 am</option> <option value="06:30:00">6:30 am</option> <option value="07:00:00">7:00 am</option> <option value="07:30:00">7:30 am</option> ETC.......... <select name="Time2" class="Body" id="Time2"> <option value="">Choose End Time</option> <option value="06:00:00">6:00 am</option> <option value="06:30:00">6:30 am</option> <option value="07:00:00">7:00 am</option> ETC........... [ICODE] You can find this at http://www.crazywayno.com/2fields.php Thanks I am using javascript for adding and removing rows from table as per user require ment like if we press ADDROW button it adds extra row to table and if we pressREMOVEROW it delets the last row.. Now i want to access the data from textbox like this.. var crpt = document.getElementById("itrtr2").value; //no. of rows for(var k=1;k<=crpt;k++) { qtyc = document.getElementById("txtRowc3"+k).value; unit_pricec = document.getElementById("txtRowc5"+k).value; alert('QTYC:'+qtyc+' UPC:'+unit_pricec); cttl = qtyc * unit_pricec; document.getElementById("txtRowc6"+k).value = cttl.toFixed(2); csbttl = csbttl + cttl; } document.getElementById("subttlC").value=csbttl.toFixed(2); it shows the value of textRowc3i in qtyc in alert box but also givs error document.getElementById("txtRowc3"+k) is null.. I tried for this but problem is not solved please help... Thank You... So I'm new around here, and to web dev in general, but I've got a (hopefully) short question. I am trying to call a function (nextMonth()) every second from the time that the cycle method gets called, until it is called again. As of now I am trying to use setInterval, (and I previously tried with setTimeout and using a callback argument but maybe I wasn't doing that properly). The problem is that after running the cycle() method for 5 or 6 seconds, the entire browser freezes up and you have to kill it and restart it. Here is my code as of now: Code: function cycle()
{
if(CYCLEINT != null) //STOP THE CYCLE LOOP
{
window.clearInterval(CYCLEINT);
CYCLEINT = null;
document.getElementById("cycle").innerHTML = "Cycle Months";
}
else //LOOP IS NOT RUNNING, INITIATE AND CONTINUE INTERVAL.
{
CYCLEINT = self.setInterval("nextMonth()", 1000);
document.getElementById("cycle").innerHTML = "Pause";
}
}
function prevMonth()
{
var dVal = $( ".slider" ).slider( "option", "value");
if(dVal > 1)
{
dVal--;
$( ".slider" ).slider( "option", "value", dVal );
refresh();
}
}
function nextMonth()
{
var dVal = $( ".slider" ).slider( "option", "value");
if(dVal < dateMax)
{
dVal++;
$( ".slider" ).slider( "option", "value", dVal );
refresh();
}
if(CYCLEINT != null && dVal >= dateMax)
{
cycle();
}
}
I am trying to impliment Javascript code to replace the MS Tabular data control. How do I go about creating a Fields collection object that has a default method of Item(idx) ie. myrs.Fields.Item(4).name is the same as myrs.Fields(4).name Im working on learning JavaScript with the help of a text book, below is the current script I am working on regarding handling forms. This script should populate the "Days" field depending on the Month selected. I understand most of it except for the parseInt function. Could anyone help describe it to me? I understand it turns a String into a Value...hmm Code:
window.onload = initForm;
function initForm() {
document.getElementById("months").selectedIndex = 0;
document.getElementById("months").onchange = populateDays;
}
function populateDays() {
var monthDays = new Array(31,28,31,30,31,30,31,31,30,31,30,31);
var monthStr = this.options[this.selectedIndex].value;
if (monthStr != "") {
var theMonth = parseInt(monthStr);
document.getElementById("days").options.length = 0;
for(var i=0; i<monthDays[theMonth]; i++) {
document.getElementById("days").options[i] = new Option(i+1);
}
}
}
Thank you! I am very interested in learning this and would love any help! Have the code check that the statement has at least one character. You can do this by using the trim method to remove spaces from the beginning and end, and then checking the length of the trimmed string. If there are no characters, the response should tell the user to enter something. For example, a possible statement and response would be: Statement: Response: Say something, please. Could someone help me with this? I'm not sure how to make it check to see if the user input has 0 characters. I'm a newbie of JS and don't know if I have got the right terms in my question. I want to lowercase all the arrays: Code: <script>
var txt = [
["Cats","Dogs","Rabbits"],
["Fish","Bones","Carrots"]
]
document.write(txt[0][1] + " love eating " + txt[1][1]);
</script>
I know I can do something like this: Code: document.write(txt[0][1].toLowerCase() + " love eating " + txt[1][1].toLowerCase()); // or var txt1 = txt[0][1] + " love eating " + txt[1][1]; document.write(txt1.toLowerCase()); But if I will loop through all the arrays and print them out, I am bothered with appending .toLowerCase(0 after each array one by one, so is there any way to bind that method at one go? I hope my question is understandable. Maybe I've used wrong terms of JS. Thank you. Hi there I'm trying to figure out what the following syntax for split means in the following line of the code arrTest[0].split('/')[0] what does ('/')[0] means in split('/')[0]? please can anyone explain Write a public static method named starPrinter that will take an int as a parameter and print lines of stars as shown below. The header of the method will be public static void starPrinter(int n) . This is what it should look like: Please help! i want to write a code which would prompt the user for his first name and last name with space in between them.The full name must be entered in the same prompt box.Using the charCodeAt() method i wanna test the first character of the user's first name as well as last name.If the first character of first name is in lowercase then it should alert the user as "first name must start with uppercase".And if the first character of second name is in uppercase then it should alert the user as "second name must start with lowercase". ..plzzzz help me and give me some code for this..i m a beginner in javascript..
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