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JavaScript - Declare Variables Question
THIS IS NOT HOMEWORK
Hi all, Simple question: Is it "legal" to conditionally declare variables? For example: First Code: if (name) {
var age = 54;
var year = 1957;
}
Second Code: var age;
var year;
if (name) {
age = 54;
year = 1957;
}
Is "First" wrong and "Second" right? Or are they both equally OK? Thanks. -- Roger Edit: Please explain your answer. Similar TutorialsI have been working on a few budget scripts that I can access from the web in using HTML. My problem is that when variable values change I need to change these values in all of the HTML files on the server. I know that there is a way to declare global variables in a single file and use those values in another file but I have not been able to find any information that tells me exactly how to do this. I have tried to put it together on my own using what little informaiton I have been able to find but have not been able to get this to work. Is there a more detailed referance that I can find somewhere or does anyone know what steps I need to take to make this happen?
How do i declare an empty array? I need to iterate through a group of arrays and search for a user-chosen word every time. The problem is i can't declare how many array elements will be needed, such as: new array = (12), because some words inside my arrays, occur more than others. So i need to decalare an empty array with x number of possible values. Can this be done? hi. i know a little php, but new to javascript. much of the syntax is identical. in reading the new rhino book (flanagan 6th), he gives the following example: Code: var square = function(x) {
return x*x;
};
okay, but then he does this: Code: square(plus1(y)) as an example of "invoking two functions in one expresson". (Prior he gives an example of defining a function with plus1, which is how I normally think of functions.) uh, square is a *variable*, but he is using it as a FUNCTION. Can somebody help me understand how this can be? how it works? I'm having trouble conceptualizng how we use a variable as a function. Very new to javascript, so I apologize in advance. I honestly tried to figure this out on my own, and I'm just not able. I'm trying to create a family tree online that has several other related family charts. I want each person's name and birth year to be stored in javascript variables, then I want to be able to just go through the tree, and put the persons name once, and have it put the appropriate name and birthyear in the little boxes that the css is creating. In the js file... I would do this for each family member. Code: var johnname = "John Smith"; var johnbirthyear = "Jan 1 1930"; var janename = "Jane Doe"; var janebirthyear = "Jan 1 1940"; var mikename = "mike wilson"; var mikebirthyear = "Jan 1 1950"; var saraname = "sara johnston"; var sarabirthyear = "Jan 1 1960"; In the HTML file... Code: <div id = "boybox"> <script type="text/javascript"> id = "john"; <!-- this is the only thing I want to have to change --> name = id+"name"; document.write(name); </script> <div id = "year"> <script type="text/javascript"> birthyear = id+"year"; document.write(birthyear); </script> </div> </div> So I thought I had it all figured out. I thought that the above would take the id of John that I added, go to the line that sets the name, add john to the word name, and then document write the variable of johnname from the js file. I know you're laughing at me because of course it instead made the value of name to johnname, then wrote the word johnname in the box. Can anyone point me in the right direction please? ultimately I want to go through and be able to just type the persons name in the html for that box once, and have it update with their appropriate info. Thanks, and sorry for such a rookie question. So here's my problem. I have a long list of buttons that I want to declare their onclick with values from an array. It looks something like this. It seems simple but obviously there's something that I'm not seeing that isn't allowing this to run.Here's what the code looks like Code: <html>
<body>
<form name="form1">
<input type="button" name="one">
<input type="button" name="two">
<input type="button" name="three">
</form>
<script>
function hello()
{
....
....
}
goodbye = ["one","two","three"]
for(i=0;i< 3; i++)
{
document.form1.goodbye[i].onclick=hello;
}
If anybody could help me out with this I would greatly appreciate it. Okay so I have a form, and it has many options and the ability to select more than one. I can get a txt input div to show up if "Other" is selected with the below Javascript, but i need to add something else to the underlined area below, which will say something like "if which.value == "other" || "other" & "anything else", show the div." ...for you see, the div disappears again if you select "other" in addition to another option. Code: function showBox(which) {
var d = which.id;
if (d == "Referred_by") {var b = 1}
if (d == "Bit_Rate") {var b = 2}
if (d == "Samp_Rate") {var b = 3}
if (d == "format") {var b = 4}
if (d == "extension") {var b = 5}
if (d == "turnaround") {var b = 6}
if (d == "language") {var b = 7}
if (which.value == "Other") {
document.getElementById("inputBox" +b).style.display="block";
}
else {
document.getElementById("inputBox" +b).style.display="none";
}
}
help is appreciated! I hope someone can help me! I have a website that sells a product through a third party merchant - ie a customer clicks my "buy now" button and they are transfered to the merchants payment processing page. once the transaction is complete the customer is sent back to my thank you page where I give them some extra stuff for free. All pretty normal I guess. The problem is this - The merchant sends back some url parameters when they transfer the customer to the thank you page and I would now like to use the "customer name" parameter to personalise the thank you page to test if this makes any difference to my return rate. Now, whilst I am not a complete newbie I haven't got a clue how to achieve this. What I want to do is have the page display: "Hello [customer] .....etc..." The customer name parameter is passed as "cname" and is one of about a dozen passed seperated, presumably, by "&" Thanks for any help! Paul Hi All Please could any one shed some light on the values of thirdVar fourthVar and fifthVar. Am i correct to say that value of thirdVar is o cromwell Any help and explanation would be great thanks. var firstVar = 'oliver' var secondVar = 'cromwell' var thirdVar = firstVar.charAt (0) + '. ' + secondVar var fourthVar = thirdVar.length var fifthVar = 'The last character is' + thirdVar.charAt (fourthVar) + '!' I wrote a script: when the same button is clicked for the first time, it should give a message "Hello World", for the second time "hello Earth". The script is not working. I don't want anybody to re-write the script, but to look at how i define variables and tell me where I am wrong. I think, this is where the main error is. my current script just outputs the message "hello world". my assumption is that functions can alter the value of a global variable. Thank you very much. Code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> title</title>
<meta http-equiv="content-type" content="text/html;charset=UTF-8" />
<script type="text/javascript">
var count=0;
function changePar() {
if(count===0)
first();
if(count===1)
second();
}
function first() {
document.getElementById("changingParagraph").innerHTML="Hello World";
var count=1;
}
function second() {
document.getElementById("changingParagraph").innerHTML="Hello Earth";
var count=0;
}
</script>
</head>
<body>
<button onclick="changePar()">Click Here</button>
<p id="changingParagraph"></p>
</body>
</html>
Noob here. Please bear with me.http://www.codingforums.com/images/smilies/tongue.gif <span title="this is the title">....</span> I need to use variables for the title instad of text. Please advise. Thank you. hello i am editing a javascript game and im trying to get a heading (h1) to display the value of a variable in a javascript function however everything i have tried always causes an error. Any help will be apreciated. Hello, Does anyone know how to list all declared variables in JavaScript ? tnx Ok i'm really new at this so i apologize beforehand if i ask a stupid question or anything. I'm working on a project that displays a GUI asking for a name as well as grades. when you enter them all it runs the grades through a formula and opens another frame with the results. I don't need any help building the GUI what i need help on is I cannot for the life of me find out how to access the variable from another frame. Everything i've seen online tells me to set the variable outside the class but i need to run the formula inside because the grades come from the user. Sorry if my code is messy, like i said i'm very new at this Code: // Loads all neccesary plugins
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class SInfo extends JPanel
{
// Setting all text fields, labels and button
public JButton submitInfo;
public JLabel SNamel, Asign, Asignl, Asign1l, Asign2l, Asign3l, Asign4l, Asign5l, Asign6l,
Asign7l, Asign8l, Asign9l, Asign10l, Folderl, Projectl, Project1l, Project2l, Project3l,
Project4l, GProjectl, blank, blank1, Sname, AsgnAvg, ProjectAvg, TotalAvg;
public JTextField SName, Asign1, Asign2, Asign3, Asign4, Asign5, Asign6,
Asign7, Asign8, Asign9, Asign10, Folder, Project1, Project2, Project3,
Project4, GProject;
double a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
p1, p2, p3, p4, gp, fldr, asgnAvg, projectAvg, totalAvg;
public SInfo()
{
setLayout (new GridLayout (20,2));
// Sets the text for the labels
{
blank = new JLabel ("");
blank1 = new JLabel ("");
SNamel = new JLabel ("Student Name: ");
Asign = new JLabel ("");
Asignl = new JLabel ("--------Assignment Grades--------");
Asign1l = new JLabel ("Assignment 1: ");
Asign2l = new JLabel ("Assignment 2: ");
Asign3l = new JLabel ("Assignment 3: ");
Asign4l = new JLabel ("Assignment 4: ");
Asign5l = new JLabel ("Assignment 5: ");
Asign6l = new JLabel ("Assignment 6: ");
Asign7l = new JLabel ("Assignment 7: ");
Asign8l = new JLabel ("Assignment 8: ");
Asign9l = new JLabel ("Assignment 9: ");
Asign10l = new JLabel ("Assignment 10: ");
Folderl = new JLabel ("Class Folder Grade: ");
Projectl = new JLabel ("--------Project Grades--------");
Project1l = new JLabel ("Project 1: ");
Project2l = new JLabel ("Project 2: ");
Project3l = new JLabel ("Project 3: ");
Project4l = new JLabel ("Project 4: ");
GProjectl = new JLabel ("Group Project Grade: ");
}
// Button text and sets listener for it
{
submitInfo = new JButton ("Submit");
submitInfo.addActionListener (new SubmitListener());
}
// Tells the program how long to make the textfield
{
SName = new JTextField (20);
Asign1 = new JTextField (5);
Asign2 = new JTextField (5);
Asign3 = new JTextField (5);
Asign4 = new JTextField (5);
Asign5 = new JTextField (5);
Asign6 = new JTextField (5);
Asign7 = new JTextField (5);
Asign8 = new JTextField (5);
Asign9 = new JTextField (5);
Asign10 = new JTextField (5);
Folder = new JTextField (5);
Project1 = new JTextField (5);
Project2 = new JTextField (5);
Project3 = new JTextField (5);
Project4 = new JTextField (5);
GProject = new JTextField (5);
}
// Adds the objects to the Window
{
add (SNamel);
add (SName);
add (Asign);
add (Asignl);
add (Asign1l);
add (Asign1);
add (Asign2l);
add (Asign2);
add (Asign3l);
add (Asign3);
add (Asign4l);
add (Asign4);
add (Asign5l);
add (Asign5);
add (Asign6l);
add (Asign6);
add (Asign7l);
add (Asign7);
add (Asign8l);
add (Asign8);
add (Asign9l);
add (Asign9);
add (Asign10l);
add (Asign10);
add (Folderl);
add (Folder);
add (blank1);
add (Projectl);
add (Project1l);
add (Project1);
add (Project2l);
add (Project2);
add (Project3l);
add (Project3);
add (Project4l);
add (Project4);
add (GProjectl);
add (GProject);
add (blank);
add (submitInfo);
}
// sets size and color of the window
{
setPreferredSize (new Dimension(400,450));
setBackground (Color.gray);
}
}
public class SubmitListener implements ActionListener
{
// Performs calculation and saves when button is clicked
public void actionPerformed (ActionEvent event)
{
// Sets variables for the text fields
Sname = new JLabel ("Student Name: " + SName);
AsgnAvg = new JLabel ("Average of Assignments: " + asgnAvg);
ProjectAvg = new JLabel ("Average of Individual Projects: " + projectAvg);
TotalAvg = new JLabel ("Total Average for the year: " + totalAvg);
// Assignments
{
String asgn1 = Asign1.getText();
a1 = Double.valueOf(asgn1);
String asgn2 = Asign2.getText();
a2 = Double.valueOf(asgn2);
String asgn3 = Asign3.getText();
a3 = Double.valueOf(asgn3);
String asgn4 = Asign4.getText();
a4 = Double.valueOf(asgn4);
String asgn5 = Asign5.getText();
a5 = Double.valueOf(asgn5);
String asgn6 = Asign6.getText();
a6 = Double.valueOf(asgn6);
String asgn7 = Asign7.getText();
a7 = Double.valueOf(asgn7);
String asgn8 = Asign8.getText();
a8 = Double.valueOf(asgn8);
String asgn9 = Asign9.getText();
a9 = Double.valueOf(asgn9);
String asgn10 = Asign10.getText();
a10 = Double.valueOf(asgn10);
}
// Projects
{
String proj1 = Project1.getText();
p1 = Double.valueOf(proj1);
String proj2 = Project2.getText();
p2 = Double.valueOf(proj2);
String proj3 = Project3.getText();
p3 = Double.valueOf(proj3);
String proj4 = Project4.getText();
p4 = Double.valueOf(proj4);
String gproject = GProject.getText();
gp = Double.valueOf(gproject);
String Sname = SName.getText();
// Folder
String folder = Folder.getText();
fldr = Double.valueOf(folder);
}
// Math Formula
{
// asgnAvg = 20%
// projectAvg = 45%
// fldr = 10%
// gp = 25%
asgnAvg = (a1 + a2 + a3 + a3 + a5 + a6 + a7 + a8 + a9 + a10) / 10;
projectAvg = (p1 + p2 + p3 + p4) / 4;
totalAvg = (asgnAvg * .20) + (projectAvg * .45) + (fldr * .10) + (gp * .25);
}
{
JFrame frame = new JFrame ("Student Average");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new SInfo2());
frame.pack();
frame.setVisible(true);
// Show the frame
frame.setSize(300, 300);
setBackground (Color.gray);
frame.setVisible(true);
}
}
}
}
And this is the second frame i am trying to open i haven't really done anything for the GUI i'm just working on it reading the variables now Code: // Loads all neccesary plugins
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class SInfo2 extends SInfo
{
// Setting all text fields, labels and button
public JLabel Sname, AsgnAvg, ProjectAvg, TotalAvg;
public SInfo2()
{
setLayout (new GridLayout (4,2));
{
Sname = new JLabel (Sname); // These are the 4 I cannot retrieve
AsgnAvg = new JLabel (asgnAvg); // These are the 4 I cannot retrieve
ProjectAvg = new JLabel (projectAvg); // These are the 4 I cannot retrieve
TotalAvg = new JLabel (totalAvg); // These are the 4 I cannot retrieve
add (Sname);
add (AsgnAvg);
add (ProjectAvg);
add (TotalAvg);
}
}
}
Thank you in advance for anyone who even looks at it Code: <script language="javascript" type="text/javascript">
function limitText(limitField, limitCount, limitNum) {
if (limitField.value.length > limitNum) {
limitField.value = limitField.value.substring(0, limitNum);
} else {
limitCount.value = limitNum - limitField.value.length;
}
}
</script>
<textarea name="txt_area" rows="3" id="txt_area" class="style3" onKeyDown="limitText(this.form.txt_area,this.form.countdown, 500);"
onKeyUp="limitText(this.form.txt_area,this.form.countdown, 500);" cols="20"></textarea><br>
<font face='Arial' size="1" color='#336600'>(Maximum characters: 500)<br>
You have <input readonly type="text" name="countdown" size="3" value="500"> characters left.</font>
</td>
This works great BUT, the value 500 (in 4 places in the above HTML) is a constant. I need this value to be set to a default when the page loads, but I have onclick events that change the style of the textarea and in doing so, I need the maximum allowed characters to change. So I need the constant value 500 to be a variable that changes with my onclick event AND gets initially set (I'm guessing) on page load..... I just do not know how to change this constant into a variable and make that variable change with onclick. Thank you. Hi there, Greetings, I have limited knowledge on Javascript. I wish someone could help me out. Thanks. I have actually found a free script named "Image Flow" (http://finnrudolph.de/ImageFlow/Examples) on the website. Then, I have uploaded it to my web server. Everything was fine and functioning well. I would like to add in new Var (to make new window appears after clicking) according to the codes given but failed to do so. The codes given are A) Code:
var target_1 = new ImageFlow();
target_1.init({ ImageFlowID: 'target_1,'
onClick: function() {window.open(this.url, '_blank');} });
Then, I just added the above code into imageflow.JS and imageflow.packed.JS. (I have attached the file below) Original: Code: domReady(function()
{
var instanceOne = new ImageFlow();
instanceOne.init({ ImageFlowID:'myImageFlow' });
});
After amendment: Code: domReady(function()
{
var instanceOne = new ImageFlow();
instanceOne.init({ ImageFlowID:'myImageFlow' });
var target_1 = new ImageFlow();
target_1.init({ ImageFlowID: 'target_1,'
onClick: function() {window.open(this.url, '_blank');} });
});
However, no pictures were loaded after that. Does it involve more than just "copy and paste"? Or what have I done incorrectly? Sorry to disturb you. Hi, I'm trying to get variables out of an iFrame for my JavaScript function. Is it possible to use an onload parameter to call the JavaScript function to run after it has loaded? If there is a better method to get remotely created variables into a JavaScript function, besides using the url, please let me know. Thanks 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;
}
Hello everyone. I am new to this forum and hope to become a good addition. Thanks in advance to whom ever might help. I am having trouble concatenating variables in the alert box. The alert will basically be: Sum of the numbers from 1 through 5 is 15. But the 5 is the var = userEntry and the 15 is the var = sumOfNumbers. Of course, the numbers 5 and 15 will be replaced by the userEntry and the calculated sumOfNumbers. I have been able to make the first variable work, but cannot get the second one. For example: alert (" Sum of the numbers from 1 through " + userEntry);. I just cannot figure out how to concatenate a second variable into the message. I hope I am making sense. I am new to javascript and working off of Murach's Javascript and jQuery. Thanks again! I am perplexed about this one. Not sure if php is the best solution or maybe javascript. ( or both.) I am writing a litle script that will go to my mysql table and take out 20 rows ( from about 10,000 rows ) based on the WHERE statement. Then I want to step through these 20 rows displaying just two filds in this fashion: First, I want to display one field in a "box" ( using divs and css ) then wait for a form input. Then while keeping the first displayed box and field display the second field in a similar box a fee lines below. Wait for a form input update some data. Then onto the next row. If I use javascript then I could keep all the processing on one page and not have to have server refreshes. But how do I get these those array elements from $row['field1'] and $row['field2'] into javascript vars ? Is this the best way to do this ? Or would php and having a couple of extra trips to the server for form processing be better ? Thanks for any input. . I have this code: Code: var player = 100;
var part1 = ('ctl00_cphRoblox_TabbedInfo_GamesTab_RunningGamesList_RunningGamesListView_ctrl0_ctl00_PlayersRepeater_ct');
var part2 = ('_PlayerImage1');
var final = part1 + player + part2;
var name = document.getElementById(final)
The variable (name) turns up null when I try to see what it is. But, it is, infact, an element on the page, and when I do it manually it works. Help? |
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