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JavaScript - General Javascript Question
I have a general javascript question. It may apply in this forum but maybe in the asp forum.
I have a java applet on a site that I am building. If someone visiting the site doesn't have their javascript turned on, and chooses not to, is there some line of code that I can use that will detect that and replace the applet for an image I create? The site is developed in asp, but being that it is a javascript question, I thought it may apply here. Gary Similar TutorialsHi, as the title states, I'm trying to learn some basic javascript, more particularly, jQuery. I HATE having to "allow" active content to run on my IE browser. Is there a way to allow active content permanantly? Instead of having to click allow each time I refresh or reload my test pages? Also, IE keeps freezing or crashing when I run pages with scripts on them. Is this just my browser? or something to do with the active content permissions? Trying to google my questions, but no luck yet. I create a cookie on my homepage that tracks a number, the next time they view, js calculates another number and subtracts the saved number. Is the cookie value created accessible from a page other than the home page? i.E. I want to create a popup window that shows the calculation but i can seem to pass the variable generated from my external js script to the internal script/page. Am i able to call the getCookie class i created from the internal script even if the class is held in the external script or is it only accessible from the page that created the cookie? If its a dumb question, sorry im relatively new. Hi, To put it bluntly I am a newbie to Javascript. I manage my own site using skills I have developed through learning code and need some help with debugging. My website is www.simplysafes.co.uk, in my IE it tells me I have an error with line 106 and char 2. Can anyone help me with this?? I would really appreciate it. Thanks in advance. James Hello, I'm new to this forum. I want to improve my ability to write JavaScript and am looking for a friendly place to find some constructive criticism and suggestions on my code. This script does not have any practical use (that I can think of); it calculates prime numbers. It is just an exercise. I am looking for suggestions on all aspects from the CSS/aesthetics to the HTML and of course the JavaScript. I posted the script here. One definite thing that bugs me is the cursor is not in the text field when the page loads. Also it would be better if the user had the option of hitting the return key in addition to the submit button. Suggestions appreciated. Code: <!DOCTYPE html>
<html lang="en">
<head>
<title>Prime Number Calculator</title>
<style type="text/css">
form{
width: 200px;
border: solid 3px blue;
border-style: double;
padding:5px;
text-align:center;
background-color:#eee;
}
#title{
text-align:center;
border: solid 1px blue;
background-color:#fff;
margin:5px;
padding:0px;
}
</style>
<script src="jquery.js" type="text/javascript"></script>
<script type="text/javascript">
var candidates = new Array();
function calculatePrimes(form){
var max = form.input.value;
//Check to make sure input is a number
if(isNaN(max)){
alert("Dude, you must enter a number!");
}
for(i=2; i<=max; i++){candidates[i]=i;}
var i=2;
for(i=2; i<Math.sqrt(max); i++){
if (candidates[i]!=0){
var j=i*i;
while(j<max){
candidates[j] = 0;
j=j+i;
}
}
}
//Pull the primes out of the candidates
i=2;
var primesOut = "";
for(i=2; i<max; i++){
if(candidates[i]!= 0){
primesOut = primesOut + ((i>2)?", " : "" ) + candidates[i];
}
}
form.output.value = primesOut;
}
</script>
<head>
<body>
<form>
<h2 id="title">Prime-Number Calculator</h1>
Check up to:<input type="text" name="input" size="5" value="100" \> <br />
<textarea rows="5" cols="20" name="output"></textarea>
<input name="calc" value="Find!" type=button onClick="calculatePrimes(this.form)">
</form>
</body>
</html>
Hello; I'll begin like so many others before me, and apologize now if this post is in the wrong place, but since I don't exactly know what type of code I need, I'm not sure where to post this query. Let me preface this request by stating the obvious; I have almost no knowledge of coding. I've been watching tutorials for help with building a site for my small service-type business. I need coding that will allow my visitors to input their zip code to see if they reside in my service area. After they enter the zip and click the submit button, a page should pop up with one of two messages when they either are or are not in my service area. (I would undoubtedly need to list [somewhere in the coding] all the zip codes that are within my service area, and any zip codes not listed would bring up a message that the visitor is outside my service area.) I hope this makes sense, and someone can point me in the right direction. Thank you, in advance to any and all who respond, and keep in mind that you may have to dumb-down your responses for me to be able to understand. Hi, I need help creating a function. It want it to: run when the page loads and every x seconds after. On loading I need it to connect to a db(preferably w ajax) and store results as variables I can reuse in other functions. And finally, after some math equations I can do, print the results on the page. I've been toying with this and I've realized its not as easy as I thought. Think I'm having problems with variable scope. Php is my main scripting language, of which I am fluent and have a working version of this. But I want it to run on the client side and relieve my server. Sorry if this is vague or incorrectly formatted, I'm on a phone browser. A guide or detailed demonstrations would be great, however pointing me in the right direction would me most apreciated. hi, I would like your help on the following matter. I have a JavaScript file currently reading from another site xml file in (utf-8) and I would like to store those data in my database which is in SQL_Latin1_General_CP1_CI_AS. Is there any function in JavaScript that can encode (convert) text from utf-8 to SQL_Latin1_General_CP1_CI_AS or any other way to do that? I've only just stated to teaching myself the general basics of web development, and I've hit a problem which I haven't been able to fix, even after some extensive research I haven't found a solution. The problem is not in the HTML I'm quite sure, hence why I deemed this to be the best place to post this. I'm sorry for wasting your time on something stupid like this, but I'm completely lost! Extra: I really couldn't think of a title that could describe this 'problem', my bad. Description: When clicking the calculate button nothing happens, but when I changed the code inthere to something easy (just print a line in a HTML paragraph) it worked. So by that I was able to deduce the problem lies somewhere in the Javascript. Code: <!DOCTYPE html>
<html>
<body>
<div>
<form>
<fieldset>
<h1>Quadratic equation</h1>
a:<input type="text" id="a" name="a"><br><br>
b:<input type="text" id="b" name="b"><br><br>
c:<input type="text" id="c" name="c"><br><br>
<button type="button" onclick="vkv()">Calculate</button>
</fieldset><br>
<fieldset>
<p id="output">Answer appears here</p>
</fieldset>
</form>
</div>
<script>
function vkv() {
var a = document.getElementById(a);
var b = document.getElementById(b);
var c = document.getElementById(c);
var D = pow(b,2) - 4 * a * c;
if (D >= 0){
var x1 = (-b + sqrt(D)) / (2 * a);
var x2 = (-b - sqrt(D)) / (2 * a);
if (x1 == x2) {
document.getElementById("output").innerHTML = "Value for x is:" + x1 + ".";
} else {
document.getElementById("output").innerHTML = "Values for x a " + x1 + " en " + x2 + ".";
}
} else {
document.getElementById("output").innerHTML = "Discriminant is negative, " + D + ".";
}
}
</script>
</body>
</html>
Reply With Quote 02-03-2015, 10:31 PM #2 jmrker View Profile View Forum Posts Senior Coder Join Date Aug 2006 Location FL Posts 3,175 Thanks 39 Thanked 510 Times in 504 Posts Welcome to the forum... NOTE: I have not tested the logic of your code to see if it give the right answers, but this should get you started by at least seeing some results displayed. Primary problem was not using Math. before the math commands like pow and sqrt. Also, need quotes around id values in the document.getElementById statements And those statements require a value associated with the element Plus, it returns a string, hence the need for a Number() function or some other string to conversion. It is always a good idea to check the error console on most browsers to get an idea of the simple problems. That's where I found most of your errors. Code: <!DOCTYPE html>
<html>
<body>
<div>
<form>
<fieldset>
<h1>Quadratic equation</h1>
a:<input type="text" id="a"><br><br>
b:<input type="text" id="b"><br><br>
c:<input type="text" id="c"><br><br>
<button type="button" onclick="vkv()">Calculate</button>
</fieldset><br>
<fieldset>
<p id="output">Answer appears here</p>
</fieldset>
</form>
</div>
<script>
function vkv() {
var a = Number(document.getElementById('a').value);
var b = Number(document.getElementById('b').value);
var c = Number(document.getElementById('c').value);
var D = Math.pow(b,2) - 4 * a * c;
if (D >= 0){
var x1 = (-b + Math.sqrt(D)) / (2 * a);
var x2 = (-b - Math.sqrt(D)) / (2 * a);
if (x1 == x2) {
document.getElementById("output").innerHTML = "Value for x is:" + x1 + ".";
} else {
document.getElementById("output").innerHTML = "Values for x a " + x1 + " en " + x2 + ".";
}
} else {
document.getElementById("output").innerHTML = "Discriminant is negative, " + D + ".";
}
}
</script>
</body>
</html>
Good Luck! Hi could someone please help?... I am a total beginner to javascript... but does anyone know of a code, including links to an image folder, for displaying 6 fullscreen images in random order without repeat for a given user? I've seen specific examples using shuffle on the site, but could anyone write a general code for any given images? Many thanks in advance I am a newbie with a newbie question =) I recently took an exam type thing using my Firefox browser (v3.5.3). I still have my browser window open that I used, and when I press the back button on the browser I get a message "To display this page, Firefox must send information that will repeat any action ..." Is there any way (either disk or memory cache) to reload the pages with out having to resend the data, OR is there any way (hex editor) to view the exam (forms) questions?? Just curious, Thanks I have an application that has a menu - one of the choices on that menu is "Contacts" - This menu is controlled by css - I've written a script that will modify the css style setting for "display" and "zindex" for the rule that controls the pull down for contacts - this worked for hover, but I am now trying to change to a click event - I successfully change the rule, but the menu doesn't display - not sure if I'm returning incorrectly form the javascript function or what - here's a code snippet: CSS: Code: .primaryNav .subMenu {
background-color: #B0967E;
position: absolute;
width: 300px;
left: 600px; /* 823px - 300px - 20 px + 97px */
padding: 10px;
display: none;
color: #fff;
font-size: 90%;
}
Javascript: Code: <script type="text/javascript">
function SetDisplayCSS()
{
var mysheet=document.styleSheets[0];
var myrules=mysheet.cssRules? mysheet.cssRules[0].styleSheet.cssRules: mysheet.imports[0].rules;
for (i=0; i<myrules.length; i++){
if(myrules[i].selectorText.toLowerCase()==".primarynav .submenu"){ //find "a:hover" rule
targetrule=myrules[i];
alert("Rule is found");
break;
}
}
targetrule.style.display = "block";
targetrule.style.zindex = "10";
alert(targetrule.selectorText);
alert(targetrule.style.backgroundColor);
alert(targetrule.style.position);
alert(targetrule.style.width);
alert(targetrule.style.left);
alert(targetrule.style.padding);
alert(targetrule.style.display);
alert(targetrule.style.color);
alert(targetrule.style.fontSize);
alert(targetrule.style.zindex);
return true;
}
</script>
html Code (names have been changed to protect the innocent) - note the onclick event handler for the contacts menu option. Code: <li class="pn test"><a href="#" onclick="return SetDisplayCSS();" name="contacts">Contacts</a>
<div class="subMenu">
<table width="100%">
<tbody>
<col />
<col align="right" valign="top" />
<tr>
<td><a href="mailto:abc@xxxxxxx.com">Service Requests</a></td>
<td>555.555.5555</td>
</tr>
<tr>
<td><a href="mailto:me@notreal.com">Bugs Bunny</a><br />Tenant Liaison</td>
<td>555.555.555</td>
</tr>
<tr>
<td><a href="mailto:blah@blah.com">blah blah</a><br />Client Services Manager</td>
<td>123.456.1234</td>
</tr>
</tbody>
</table>
<p><a href="xxxxxxxx.htm" class="more">More Contacts...</a></p>
</div>
</li>
Thanks for any help...... HI Guys!! My name is Megan and I am a college student in need of some JavaScript help for my computer science class!! My professor is making us complete some stupid class project for finals and I can't figure it out! He suggested that we may try to find a JavaScript Website to help us if we have trouble figuring out how to write the code. I have looked and looked and can't find out how to fix my code!! We have to write code to make a slot machine .. I have started the code based on what he gave us and have tried my hardest to figure out how to complete it but I do not know how to finish it. I have the images working correctly (kind of.. the second one seems to have problems loading? I dunno what I did to mess that up) and the counter working, but I need to make it add 13 credits when all 3 images are the same. I added code that I thought would work but it's not for some reason that I can't figure out. It should also pop up an alert screen when all 3 are correct and you win. I guess this would have to be including with the if statement and something like alert('You win 12 credits!!!') Lastly I need to add code that prevents the person from playing when the credit line is 0 (so you can't get - credits!) and I have no idea how to do this. Any help would be greatly appreciated! Here's what I have so far! HI Guys!! My name is Megan and I am a college student in need of some JavaScript help for my computer science class!! My professor is making us complete some stupid class project for finals and I can't figure it out! He suggested that we may try to find a JavaScript Website to help us if we have trouble figuring out how to write the code. I have looked and looked and can't find out how to fix my code!! We have to write code to make a slot machine .. I have started the code based on what he gave us and have tried my hardest to figure out how to complete it but I do not know how to finish it. I have the images working correctly (kind of.. the second one seems to have problems loading? I dunno what I did to mess that up) and the counter working, but I need to make it add 13 credits when all 3 images are the same. I added code that I thought would work but it's not for some reason that I can't figure out. It should also pop up an alert screen when all 3 are correct and you win. I guess this would have to be including with the if statement and something like alert('You win 12 credits!!!') Lastly I need to add code that prevents the person from playing when the credit line is 0 (so you can't get - credits!) and I have no idea how to do this. Any help would be greatly appreciated! Here's what I have so far! Code: <html>
<head>
<title> Slot Machine</title>
<script type="text/javascript" src="http://balance3e.com/random.js"></script>
<script type="text/javascript">
function SpinSlots()
// Assumes: slot images are in http://balance3e.com/Images
// Resultes: displays 3 random slot images
{
var slot1, slot2, slot3;
slot1 = RandomOneOf(['lemon', 'cherry', 'bar']);
slot2 = RandomOneOf(['lemon', 'cherry', 'bar']);
slot3 = RandomOneOf(['lemon', 'cherry', 'bar']);
document.getElementById('slot1Img').src =
'http://balance3e.com/Images/' + slot1 + '.jpg';
document.getElementById('slot2Img').src =
'http://balance3e.com/Images/' + slot2 + '.jgp';
document.getElementById('slot3Img').src =
'http://balance3e.com/Images/' + slot3 + '.jpg';
document.getElementById('credits').innerHTML =
parseFloat(document.getElementById('credits').innerHTML) - 1;
if (slot1 == slot2 == slot3)
{
document.getElementById('credits').innerHTML =
parseFloat(document.getElementById('credits').innerHTML) + 13;
}
}
</script>
</head>
<body>
<div style="text-align:center">
<p>
<img id="slot1Img" border=1 alt="slot image"
src="http://balance3e.com/Images/cherry.jpg">
<img id="slot2Img" border=1 alt="slot image"
src="http://balance3e.com/Images/lemon.jpg">
<img id="slot3Img" border=1 alt="slot image"
src="http://balance3e.com/Images/bar.jpg">
</p>
<input type="button" value="Click to Spin" onclick="SpinSlots();">
<p>
Credits Remaining: <spin id="credits">20</span>
</p>
</div>
</body>
</html>
So erm. Hello there. I fail at javascript, and yet, I'm trying it. Anyways, I'm working on this thing. It's an extension for google chrome very similar to firefox plugins and so on. I'm making an extension so that, when installed, it changes the look of facebook completely. I have successfully changed the colors. However, I am having some trouble getting my javascript to change images. If anybody out there has some insight on what I'm doing wrong, I am glad to accept any kind of help that anyone is willing to give me, lol. What I've done so far: I have to change the facebook logo (what I'm trying to do now) and then change the links, and very few more things, and I'm done. Problem: I can't figure out how to change the image. I can change the background color, as you saw earlier. I just need a code to change the image. The CSS behind it is: Code: #pageLogo a{background:#3b5998 url(/rsrc.php/z8S5R/hash/ez3x5cuc.png) no-repeat -21px 0;display:block;position:absolute;height:31px;left:-6px;width:103px;top:10px}
and the HTML implementing it is: Code: <h1 id="pageLogo"><a href="http://www.facebook.com/?ref=logo" title="Home" accesskey="1"></a></h1> and my structure of javascript is: Code: for(i=0;i<=document.getElementsByTagName("div").length;i++)
{
if(document.getElementsByTagName("div")[i].id != null)
{
if((document.getElementsByTagName("div")[i].id=="blueBar"))
{
document.getElementsByTagName("div")[i].style.backgroundColor='#B22222';
}
if(( document.getElementsByTagName("div")[i].id == "headNavOut"))
{
document.getElementsByTagName("div")[i].style.backgroundColor='#8B0000';
}
}
}
});
I appreciate any help anyone's willing to give. I'm trying to figure out this question that was assigned to me, as I haven't done alot on javascript before but I've tried to get most of this, I'm just not sure if this is correct. If anybody could help it would be greatly appreciated. The question is as follows: You are provided with a string array called country that contains the name of every country that the Ski Club visits. For example one element of this array might be as follows: country[0] = "Austria" Another array called villages contains strings with information on village names and altitude in a particular country. For example: villages[0] = "Austria:Seefield 850m*"; Write a JavaScript function snowReport(countryIndex) that will use the arrays provided to write a report of all villages that include a given country. The function will be passed an integer representing the index of an element of the country array. A match is found if the country appears in a string (Hint use appropriate JavaScript function to evaluate if a country name is contained in a village string.) All matching villages should be displayed. Output should be displayed in the villages div element you defined in part (a). Output is shown for a search for Austria in Figure 1b. <script type="text/javascript"> function makeArray() { var country = new Array(5); country[0] = "Austria"; country[1] = "Canada"; country[2] = "France"; country[3] = "Germany"; country[4] = "Switzerland"; return country; var villages = new Array(2); villages[0] = "Austria:Seefield 850m*"; villages[1] = "Austria:Ellam 100m"; return villages; } function snowReport(countryIndex){ var string = ""; for (var i = 0; i < countryIndex.length; i++){ str += countryIndex[i] + " "; } return str; } </script> </head> <body> <script> var x = makeArray(); document.write(snowReport(x)); </script> </body> </html> Many thanks! Hey Guys, I was creating an image map with rollover images. I was just wondering if I could add a fade effect to the transition. The underarms is the only rollover that works at the moment. Please check the source code for the code because it's too long to post here. http://wedezign.com/chris/ I think this is a pretty easy to fix error made by a newb ( me. Can anyone tell me why the call to "this.slideNext() " in the code below does not work. Apparently "this.slideNext() " is not a function? Code: function ScoopAnimation(_path, _start, _end, _delay){
this.start = _start
this.end = _end;
this.delay = _delay;
this.path = _path
this.currentFrame = _start;
this.slideNext() = function (){
this.currentFrame ++;
console.log(' next this.currentFrame : ' +this.currentFrame );
}
this.start= function ()
{
console.log('next this.start() : ' +this.currentFrame );
//THE NEXT LINE CAUSES THE ERROR!
this.slideNext()
}
this.start();
}
I'm not really looking for someone to fix/answer this for me, but maybe give me a hit in the right direction. I need to fix this while loop to run correctly, but has errors in the code. This code is supposed to fill an array with numbers 1 through 100 and then print them. Here is the code: <script type="text/javascript"> /* <![CDATA[ */ var count = 0; var numbers = new Array(100); while (count < 100) { numbers[count] = count; ++count; } while (count < 100 ) { document.write(numbers[count]); ++count; } /* ]]> */ </script> What i am most confused about is this part of the code numbers[count] i don't understand what is going on there. Sorry i am very new to this. Any ideas would be appreciated thank you. I have a question about Javascript. Hello. I need help with JavaScript enabled. My job so that I can automatically send button to be pushed faster. I use google chrome. For example; Automatically have form filling add-ons. (Autofill), but only to fill the send button will not print. How can I do this automatically? Button codes; <input type='submit' name='post_shout' value='Shout' class='button' /> Google Chrome address bar: javascript: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx what I need to write here? Can I do it after 1-2 seconds and fill out? Many thanks in advance. (My English is poor) Hello guys, Im new to Javascript,please help me ya in my php code, I retrieve a ID value and assign to variable like below PHP Code: $id = $gettingdata['id']; and I want this id to be include together with javascript "insertsubcat" function like below Code: <a href="javascript:insertsubcat('.$ID.');"/>Click to insert this data</a>
in the javascript page, I dont know how to call back the id value and i try like code below but it doesnt work Code: function insertsubcat(data) {
var data = data.value;
.
.
.
.
}
Any idea? Thanks Azhan Malaysia I was going through an article on JavaScript objects on "http://www.howtocreate.co.uk/tutorials/javascript/javascriptobject" and there I read Quote: Intrinsic objects - variable types with constructors. * Array * Boolean * Date * Function * Image * Number * Object * Option * Regular Expression * String does it mean that, whenever I want to use any of these objects, I have to create it using new and only then I can use its properties or methods ? 1) There are other objects like document, history, location, navigator, parent and screen. If objects which need to be created using constructor are called intrinsic objects , then what are other objects which can be used without constructor are called as ? Array, Boolean, Image, Date etc all start with capital letter. While document, history, navigator etc start with lower case letter. Why is that ? Is there any difference between objects that start with upper case and those start with lower case ? Are they known by different names ? Thanks |
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