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JavaScript - Plot A Line Using Given Variables
Hi ! I am trying to plot a line using the variables that I have derived in this "rectangular to polar" conversion program. I am just new to javascript and to programming generally. But with the help of sample codes here, I have managed to deal with some easy problems.
I have read that drawing in javascript isn't so easy. Could you give me some hints on how to draw the following variable in polar coordinates. Do I need to use another programming language aside from javascript ? Thank you very much !!! Code: <html>
<head>
</head>
<body>
<script language="javascript" type="text/javascript">
function PolarConvert(){
num_1=Number(document.addition.entry_1.value);
num_2=Number(document.addition.entry_2.value);
valNum1=Math.pow(num_1,2);
valNum2=Math.pow(num_2,2);
valNum3=Math.sqrt(valNum1 + valNum2);
valNum4=Math.atan(num_2/num_1);
valNum5=(valNum4*180)/Math.PI;
document.addition.endVal.value=valNum3;
document.addition.endVal2.value=valNum5;
}
</script>
<form name="addition">
<input type="text" name="entry_1">+ j
<input type="text" name="entry_2"> =
<input type="text" name="endVal"> angle
<input type="text" name="endVal2"><br>
<input type="button" value="Convert to polar" onclick="PolarConvert()">
<input type="reset" value="Clear">
</form>
</body>
</html>
Similar TutorialsI am trying to implement a javascript on a page and the error that I get is Parse error: syntax error, unexpected T_STRING, expecting ',' or ';' in /fullsize/image.php on line 131 On line 131 the code is Code: echo"<img id='thepic' onClick="scaleImg('thepic')" onLoad="scaleImg('thepic')" src='$image'>";
hi, I am tring to display some texts in a textbox using \n to create a new line but it does not work. PHP Code: <script> document.getElementById("txtbox1").value=" this is my firstline \n This is my second line \n this is my third line" </script> <input type="text" id="txtbox1"> thanks sub: Please help me to get all characters from every line from a word-wrapped div using javascript. Detail: Need to get all the characters for first line, second line, third line,... separately from the word-wrapped div Thanks for your reply. the HTML code: Code: <ul id="ul1"> <li>1111</li> <li>2222</li> </ul> <div id="div1"></div> the javascript code: Code: var oDiv=document.getElementById('div1');
oDiv.style.left=getPos(this).left+this.offsetWidth+'px';
oDiv.style.top=getPos(this).top+'px';
function getPos(obj){
var aPos={left: null, top: null};
while(obj)
{
aPos.left+=obj.offsetLeft;
aPos.top+=obj.offsetTop;
obj=obj.offsetParent;
}
return aPos;
}
why it write the while loop,and what's effection of the while loop obj=obj.offsetParent; what's this line meaning? How do I get new line to work in javascript. Everytime I try to use it, it never works. There should be a new line with 5 * instead of having 17 * on one line. Code: <html>
<body>
<script type ="text/javascript">
var x=0;
for (x=0;x<=12;x++)
{
document.writeln("*");
}
document.writeln("\n");
for (x=0;x<=5;x++){
document.writeln("*");
}
</script>
</body>
<html>
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 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>
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. 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) + '!' 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. I know you can add data to array wiht the push() method but can you add a whole new line as in a = new Array a [1] [1,2,3] so it would create a new line a [2] [4,5,6]; The syntax to the array i think is wrong but you get the question. I've started studying JavaScript recently. The following simple scenario from the Russian textbook cannot be implemented on my PC. Code: <HTML>
<HEAD>
<TITLE>Creeping line example</TITLE>
<SCRIPT LANGUAGE="JavaScript">
var msg = "Взгляните, как ровно движется строка! Вставляет?";
spacer = "... ...";
pos = 0;
function ScrollMessage() {
window.status = msg.substring(pos, msg.length) + spacer + msg.substring(0,pos);
pos++;
if (pos > msg.length) pos = 0;
window.setTimeout("ScrollMessage()",80);
}
ScrollMessage();
</SCRIPT>
</HEAD>
<BODY>
<h1>Creeping line example</h1>
Have a look at the creeping line in the lower part of your browser window.
</BODY>
</HTML>
I just typed the script from the book char by char. I use Firefox browser, v.3.5.7. The error console does not display any mistakes. Please, explain me why creeping line does not appear in the browser window. I have a slideshow that goes through pictures once you click on the Play button and doesn't stop until you press on the Stop button. How can I make it so that it automatically plays once the website loads without having to click on the Play button? Heres the code: Code: <div class="tabs png"><span class="tabs-inner"><a href=""></a> <a href=""></a> <a href=""></a> <a href=""></a> <a href=""></a> <a href=""></a> <a href=""></a></span></div>
<div class="slider-indent-button">
<a href="#" onClick='$("div.tabs").tabs().play();'>Play</a>
<a href="#" onClick='$("div.tabs").tabs().stop();'>Stop</a>
</div>
All help is much appreciated!!! Hi, I'm creating a new email in javascript via outlook. When i try entering a line break "\n", "\r", "\r\r", etc, Outlook just ignores it completely. I've tried using "%0D%0A" and "fromCharCode(10)" as well but it doesnt seem to read it as a line break. Is there any way to code it so that a line break or a carriage return appears on outlook? Hello: First post here on CS ... I am wondering why my code will not write a new line or line break. This is fine: Code: <script>
document.write("Hello and welcome to javascript!");
</script>
But when I try to put a message on two lines, it does not work. The book I'm reading and several websites have stated the below codes will work, but neither do: Code: <script>
document.write("Hello and welcome to javascript! \n");
document.write("It is a tricky language to learn!")
</script>
Code: <script>
document.writeln("Hello and welcome to javascript!");
document.writeln("It is a tricky language to learn!")
</script>
Am I missing something? Is there any way to have a multiline text string in javascript? For example strname="line one of string line two of string"; I get an error that the string is not terminated. The reason I want to do this is from the following code: Code: <textarea name="comments" id="comments" cols="90" rows="8" ></textarea>
<?php if (isset($_REQUEST["registered"]))
{
$end_of_line=chr(10);
$carriage_return=chr(13);
$step1=str_replace($carriage_return,"",$comments);
$step2=str_replace($end_of_line,"<br>",$step1);
echo "<script type='text/javascript'>\n";
echo "intermediate='",$step2,"';\n";
echo "comment_value=",'intermediate.replace(/<br>/g,"\n")',";\n";
echo "document.getElementById('comments').value=comment_value;</script>\n";
}?>
I an getting the value to set a textarea to from the server. It may have newline characters. If there is a way to have a multiline string, then I could skip all the steps and just echo one javascriopt command. Can this be done? CraigRS I have a piece of code that randomly picks a line from a preset list and displays it whenever the page is loaded. I'm using it to generate random quotes on my pages. At the moment, there seems to be a good chance that when the page loads no quote appears at all, just a blank space. Anyone know why this could be happening? the code I am using is: Code: <script type="text/javascript">
q0= "<img src=\"images/quotes/01.png\" />";
q1= "<img src=\"images/quotes/02.png\" />";
q2= "<img src=\"images/quotes/03.png\" />";
q3= "<img src=\"images/quotes/04.png\" />";
q4= "<img src=\"images/quotes/05.png\" />";
q5= "<img src=\"images/quotes/06.png\" />";
q6= "<img src=\"images/quotes/07.png\" />";
q7= "<img src=\"images/quotes/08.png\" />";
q8= "<img src=\"images/quotes/09.png\" />";
q9= "<img src=\"images/quotes/10.png\" />";
q10= "<img src=\"images/quotes/11.png\" />";
q11= "<img src=\"images/quotes/12.png\" />";
var ran_unrounded=Math.random()*11;
var ran_number=Math.round(ran_unrounded);
document.write(eval("q"+ran_number));
</script>
Hey guys. I'm working on a "Preview Post" function. When the Preview Post button is clicked, it should reload the page, show the preview above the textarea, then send the text back to the textarea so the user can keep working. It works until I move to a second line. If there are line breaks they don't get shown in the preview. Also, the text isn't sent back to the textarea. I have a pair of functions that are supposed to handle the input string. The first function records the input when typing, and the second function picks up the post to print as a preview: You can see what I mean he Code: function preview()
{
var preview = window.document.postform.inputpost.value;
window.document.hidden.inputpreview.value = preview;
}
function copypreview()
{
var copypreview = '<?php echo $_POST[inputpreview]; ?>';
window.document.postform.inputpost.value = copypreview;
}
Here's how I use them: Code:
<body onload='copypreview();'>
<?php include("navbar.php"); ?>
<?php if ($_GET[preview])
{
echo "<table id=blog><tr><td>";
echo $_POST[inputpreview];
echo "</td></tr></table>";
} ?>
<form name="postform" action="submitpost.php" method="post">
Post Title
<input size="40" type="text" name="inputtitle" id="inputtitle">
<?php include("tagbar.php"); ?>
<textarea onchange="preview();" cols="101" rows="20" id="inputpost" name="inputpost"></textarea>
<div align=center>
<input type="submit" value="Submit"/>
</form>
<form name="hidden" method="post" action="addpost.php?preview=1">
<input type="hidden" name="inputpreview">
<input type="submit" onClick="preview();" value="Preview Post"/>
</form>
Sorry I know it's a lot of code. I tried to make it as readable as possible. Can someone tell me how to fix this? I thought I might have to find a way to insert <br> tags when the user hits the Enter key, but I could have sworn this thing was working with line breaks before. Hi, I'm trying to do an assignment, and have copied a piece of code to learn while I do, if you see what I mean. Problem is, I'm having real trouble with one of the lines of code. If someone could tell me basically what it does, I'd be very greatful! Here's the code: if (height[i] == -(array[i].height)) The - before (array[i].height) is really confusing me! Thanks in advance! Hi there, I am working on javascript, the problem i have faced here is, i am unable to break the line in javascript. Actually i am using a javascript to open Microsoft Outlook Express, And in the body text i am sending some value like "Name and Address(Shown in code)". I want after task it should break the line and the value of Address will start from new line. But i am unable to do that. The code i have used is given below. Code: // JScript File
function EmailIt(emailTO,strAddress,strName)
{
var daReferrer = document.referrer;
var task = escape(document.URLUnencoded);
var issue_id = document.URLUnencoded.split("=");
var email = emailTO;
var Address = strAddress;
var Name = strName;
var subject = "Issue Task number is " + issue_id[issue_id.length-1] + " - " + Address ;
var body_message = "Name "+ Name + " <br />\r\n " + " Address " + Address;
var mailto_link = 'mailto:'+email+'?subject='+subject+'&body='+body_message;
win = window.open(mailto_link);
if (win && win.open &&!win.closed) win.close();
}
Also i have used following syntax to break the line: //body_message += '<br />\r\n'; //body_message += " "; //body_message += "\"\n\"";. But didn't got succeed. Can anybody help me to come out of this problem. Regards Vimal kumar Madhepura, Bihar |
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