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JavaScript - A Few Quick Questions
Hi all,
This is a quickie. I'm a JavaScript newbie. I have had a crack programming with it but I need some questions answered to help my understanding. Please tell me the convention that governs the use of "" and '', because so many articles that I am finding in my learning journey are using them interchangeably and it is so confusing. For instance, but not limited to, take the id and value tags of an <input type=... of whatever. Is it best to use '' or "" for the labels you give? What is the convention governing the use of a ; (semicolon) because so many people use one where others do not. I'm under the impression it is an EOL terminator like in Bash, right? So it goes after declaring variables or after something within an if statement perhaps? Thanks QF Similar TutorialsI know that global variables are properties of the window object... so does that mean that local variables are properties of the function they belong to? And does that mean that functions are methods of the window object and that nested functions are methods of the function they belong to?
more or less when a user has a command pop up in this prompt they are asked to type another item from a list with an okay or cancel at the bottom how do i stop the script if a user hits cancel and move onto the calculation step and by pass the other imput prompts? sorry if this isn't the clearest, i am new at javascript. THanks in advance. Ok, this might sound stupid but I swear, it's about to drive me crazy. how does one check whether or not a javascript "global" variable is undefined that will work with IE? I've tried each variation of code and checked countless forums: Code: if (saved == undefined || saved == null) {
alert('saved');
saved = new Array();
}
returns no error and nothing happens Code: if (saved == 'undefined') {
alert('saved');
saved = new Array();
}
-- returns error = saved is null or not an object Code: if (typeof(saved) == undefined) {
alert('saved');
saved = new Array();
}
returns same as above help me please, I'm confused more then anything. the link is also: http://doodlekins.hcents.com/designer Basically the if statement isn't returning true and nothing on the inside of it is ever happening. Hey guys, I am very VERY new to javascript and while trying to do some simple validating I got stuck and am in a complete loss. Heres my code: Code: <html>
<head>
<title>Tareas | Numero 4</title>
<link rel="stylesheet" type="text/css" href="style.css" />
<script language="javascript" type="text/javascript">
function verify()
{
total = "Te faltaron los siguientes Campos por llenar: \n";
nombre = document.getElementById("txtnombre");
if (nombre.value == "")
{
total = total + "\nnombre";
}
apellido = document.getElementById("txtapellido");
if (apellido.value == "")
{
total = total + "\napellido";
}
if (total == "Te faltaron los siguientes Campos por llenar: \n")
{
return true;
{
else {
alert(total);
return false;
}
}
</script>
</head>
<body>
<center><h3>Formulario de registracion</h3></center>
<div id="formulario_overall">
<form method="post" onsubmit="return verify();" action="/">
<div id="formulario_left">
Nomb <br /> <br />
Apellido: <br /> <br />
Clave: <br /> <br />
Confirmacion de Clave: <br /> <br />
Edad: </br> <br /> <br />
Sexo: </br> <br />
Ciudad: </br> <br />
</div>
<div id="formulario_right">
<input type="text" name="nombre" id="txtnombre" /> <br /> <br />
<input type="text" name="apellido" id="txtapellido" /> <br /> <br />
<input type="password" name="p_1" id="p1" /> <br /> <br />
<input type="password" name="p_2" id="p2" /> <br /> <br />
<input type="text" name="age" id="age" /> <br /> <br />
<input type="radio" name="sex" id="sex" /> Femenino<br />
<input type="radio" name="sex" id="sex" /> Masculino<br />
<input type="text" name="city" id="city" /> <br /> <br />
</div>
<div id="formulario_bottom">
Terminos De Uso:
<textarea rows = "4" cols = "37" readonly="readonly">
Accepto que voy a darle +20 puntos a Daniel Martinez.
Accepto que voy a darle +20 puntos a Daniel Martinez.
Accepto que voy a darle +20 puntos a Daniel Martinez.
Accepto que voy a darle +20 puntos a Daniel Martinez.
</textarea><br />
<div><input type="radio" name="terms"> Accepto
<input type="radio" name="terms" /> No Accepto</div> <br />
<center><input type="submit" value="Submit" />
<input type="reset" value="Limpiar" /></center>
</form>
</div>
</div>
</body>
</html>
Hope you guys can help me out :/ I just feel like I am doing something totally wrong. ok so im making a runescape private server and i have all the files and i compile and i only get 1 error. witch is the following. http://imageshack.us/content_round.p...upload&newlp=1 can anyone help me out pleasE? I am new to java and tried writing the code for practice but it doesn't seem to work <html> <Head> <title>Discount</title> <script language ="Javascript"> <!-- function CalculateBalance(numItems,totPrice,discount) { var balance; balance = (1 - discount)*totPRice; alert ('Your balance is $'+balance +' Thank You.'); document.write("<br>YOu bought "+ numItems+" items for $"+totPrice); document.write("<br>Your balance is $"+ balance+" your discount was"+discount*100+"% Thank you"); } //--> </script> </head> <script language ="Javascript"> <!-- var discount; var numItems = parseInt(prompt('HOw many time did you buy [ >=12 is 20% and >= 6 is 10% discount]',"0")); alert ('You bought '+numItems +' items.'); document.write("You bought "+ numItems+" items."); var totPrice = parseFloat(prompt('The total price that you paid was',"0.0")); if(numItems >= 12) {discount = .2;} else if (numItems >=6) {discount+ .1} else {discount = 0;} CalculateBalance(numItems,totPrice,discount); //--> </script> </html> It only prints to the screen the number of items I bought I tried posting this: <button type="button" onclick="JavaScript:alert('Let's assume.....')"> <img src="question.jpg" alt="Click here" /> <br />Click for Answer!</button> and it shows the button with the picture, but I am unable to click it. Can you please help me? Thank you in advance. Hi, I have the below code, but got a problem with it. The problem is, if you click Test 1, then Test 2 you have to click Test 2 twice, this also repeats for Test 3, 4 and 5. It is the same with onclick. I presume the problem is in the javascript code, but not sure where to start. Can anyone help <html> <head> <title>Test JS</title> <script language="javascript"> <!-- var state = 'none'; function showhide(layer_ref) { if (state == 'block') { state = 'none'; } else { state = 'block'; } if (document.all) { //IS IE 4 or 5 (or 6 beta) eval( "document.all." + layer_ref + ".style.display = state"); } if (document.layers) { //IS NETSCAPE 4 or below document.layers[layer_ref].display = state; } if (document.getElementById &&!document.all) { hza = document.getElementById(layer_ref); hza.style.display = state; } } //--> </script> </head> <body> <p><a href="javascript:showhide('sect1');">Test 1</a></p> <div id="sect1" style="display: none;">Test 1 content</div> <br><br><br> <p><a href="javascript:showhide('sect2');">Test 2</a></p> <div id="sect2" style="display: none;">Test 2 content</div> <br><br><br> <p><a href="javascript:showhide('sect3');">Test 3</a></p> <div id="sect3" style="display: none;">Test 3 content</div> <br><br><br> <p><a href="javascript:showhide('sect4');">Test 4</a></p> <div id="sect4" style="display: none;">Test 4 content</div> <br><br><br> <p><a href="javascript:showhide('sect5');">Test 5</a></p> <div id="sect5" style="display: none;">Test 5 content</div> </body> </html> Don't even know where to post this as I have never thought about it; I've just made my game have a image upload script in, and a album showing the users images. How could I make have a link saying "Copy Link" that if clicked will copy the picture url to clip board. I've seen places like w3schools use in but not as tuts though. Please this will really help, desplayin the link is ugly EDIT: I've found the following code but I don't understand how I turn it into a link or button. Code: <script>
window.clipboardData.setData('text','This has been copied to your clipboard.');
</script>
Urghh I've always done it this way but it's nagging me. Is there a better way of checking if a value is equal to 1 or 2 or 3 than doing it this way. Code: if(var === Cat || var === Dog || var === Chicken || var === Frog) Not working code ^ lol Cheers guys 1. I am in the midst of making a website and doing a few things but am thinking of adding a log in section for members can i put a password directly on a video file? or do i have to do it to the page? 2. Also looking for a good provider to upload my site to, what does everything suggest for this? Thanks JavaScript functions must be called: A. from the server B. implicitly C. explicitly D. A and C, but not B. E. None of the above. JavaScript commands written outside of a function will be executed: A. by the server. B. implicitly. C. explicitly. D. never, they are ignored. E. None of the above. The best loop for iterating through an array is A. Enhanced For loop B. While C. Do Until D. Do While. E. None of the Above. JavaScript Arrays are always passed to functions? A. By Reference. B. By Value. C. Globally. D. As a string. E. None of the Above. The best way to execute JavaScript code when you first bring up a page is: A. onload event B. JavaScript code outside of any function. C. onstart event. D. All of the above. E. None of the Above. Write a JavaScript function to handle a callback: Assume the following input fields: <input type="text" id="lastName" name="lastName" /> <input type="text" id="firstName" name="firstName" /> <input type="text" id="phone" name="phone" /> <input type="text" id="email" name="email" /> A callback function will receive a pipe delimited string from the server as such: Last-name|first-name|phone#|email Example: Doe|Jane|415-555-1212|jane.doe@gmail.com The callback function is: function customer_Callback ( content ) { // use the split method to convert content to an array. // use document.getElementById() to get each of the above input fields. // populate from the array. } ----------------------------------------- I am having serious trouble with these problems, I beseech you! There will be a special prize to whoever answers correctly all these questions first. Thanks! Hi again, I have 2 new questions for you all! 1.) *RESOLVED* 2.) So in this form: Code: <form name="form" action="email.php" method="post">
<div id="dynamicInput">
<br> <input type="checkbox" name="1" /><input type="text" name="i[]">
</div>
<input type="button" value="Add another text input" onClick="addInput('dynamicInput');">
<br>
<input name="email" type="text"> <br />
A12098 <input name="verify" type="text">
<input name="submit" type="submit">
</form>
I have a button that will add a form element to the form. In this case, it adds a checkbox and a text box. The name on the checkbox goes up from 1-30 (thats the max amount of fields that can be added) and the text box has a name of i[]. Is it possible for the user to click on the checkbox and the corresponding text box (the one next to the checkbox) will be disabled so editing is stopped? Then they could un-click it and it would be editable again. Thanks in advance! I put the jquery script into my subdirectory. In the header which one is correct: Code: <script type="text/javascript" src="../jquery/jquery.js"></script> or Code: <script src="../jquery/jquery.js"></script> And there is this code: do I put this in the body and enclose it with the <script>tag? Code: $(function(){
// set interval for 5 minutes
setInterval(function(){
$.ajax({url: "keep-alive.php"});
}, 300000);
});
I can not figure out why my function is not working or why my alert does not pop up.. can anyone help? When you enter a total in the box, all I need to do is have a total with shipping show up in an alert box. (Minimum shipping is $1.50, if the total is over $25 shipping is 10%) <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>CalcShipping</title> <meta http-equiv="content-type" content="text/html; charset=iso-8859-1" /> <script type="text/javascript"> /* <![CDATA[ */ function calcShipping() { var priceInput; var total; priceInput = document.form1.subtotal.value; if (priceInput <= 25) total = 1.5 + number(priceInput); } else { total = number(priceInput) + (number(priceInput) * .1); } window.alert("Your total is $" + total + ); /* ]]> */ </script> </head> <body> <h1>To find out your shipping costs, please enter your purchase price:</h1> <form action ="" name ="form" method = "post" onsubmit="calcShipping();"> <div style="text-align: center"> <input type="text" name="subtotal" value= ""/> <input type="submit" value ="submit"/> </div> </form> </body> </html> </code> I have a twitter widget at this side http://1905.gs/blog on the right sidebar. At the bottom of the widget there is the follow me link. I would like to embed a follow me "button" which I have created the script for: The button script: <a href="https://twitter.com/1905GS" class="twitter-follow-button" data-show-count="false" data-lang="tr">Takip et: @1905GS</a> <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");</script> And here is the current javascript link: http://www.1905.gs/blog/wp-content/p...tter-widget.js How I am trying to make it look like: http://a1202.hizliresim.com/u/d/2nryy.jpg thank you very much for your help, I found this "game" that helps you practice regexp. I'm stuck on this one: Hi... i have this code: <script type='text/javascript'> cookie_name = GetCookie("href_location"); if(cookie_name){ alert("Cookie found, redirecting to stored cookie."); document.location.href=cookie_name; } </script> I will like to create a iframe using the info from the "cookie_name" value <iframe name="FRAME1" src="cookie_name" width="350" height="320" frameborder="0" scrolling="auto"></iframe> I have a script that set a cookie with the value of a chosed website, what i need now is to create an iframe with that value. Any help will be apriciated. Sorry for my poor enlish It's been many years since I've done simple javascript and html. I was wondering if javascript would be the language of choice for this project. I would like a simple matrix with individuals on the left column, and locations on the top row. Clicking in any cell turns on a green dot/box/circle or whatever. Clicking on a green whatever makes it disappear. Even more handy would be to make each cell in a row mutually exclusive of the others; turn any cell on and the other cell turns off. If anybody has thoughts or advice, I would greatly appreciate it. This is intended to be a tool for our intranet for tracking the location of key people. Thankfully, Russ |
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