JavaScript - Learning Loops & Want To Produce A Number Sequence
I have no js experience or coding experience of any kind other than the last few hours of reading a book called 'object-oriented javascript', and all was well until loops.
firstly, this is how he teaches the while loop... var i = 0; while (i <10) {i++;} which results in 9 we move on to for loops... var res =''; for( var i = 0; i <10; i++) {res += 'sometext' ;} which repeats, but I'd like to be able to make that into a sequence of numbers... 123456789. how do I do that? thanks. Similar TutorialsHi all.. I've been trying to get random numbers in JS. It works when I assign fixed values, but when I want those values to come from a form, I get all the problems.. any comments on my script? Thanks. M [CODE] <script type="text/javascript"> function random() { var x=document.getElementById("text1").value;// num ingresado por el usuario var y=document.getElementById("text2").value; //var x=1; //var y=6; num=Math.floor(x + Math.random() * y); var r=document.getElementById("demo") r.innerHTML=num; } </script> [CODE] This is the program.and here is the script. I have tried all I know without success. This Sources program is on another css/html forum for another issue. Frank Code: //** Dynamic Drive Equal Columns Height script v1.01 (Nov 2nd, 06) //** http://www.dynamicdrive.com/style/blog/entry/css-equal-columns-height-script/ var ddequalcolumns=new Object() //Input IDs (id attr) of columns to equalize. Script will check if each corresponding column actually exists: ddequalcolumns.columnswatch=["Content1", "content2", "content3",] ddequalcolumns.setHeights=function(reset){ var tallest=0 var resetit=(typeof reset=="string")? true : false for (var i=0; i<this.columnswatch.length; i++){ if (document.getElementById(this.columnswatch[i])!=null){ if (resetit) document.getElementById(this.columnswatch[i]).style.height="auto" if (document.getElementById(this.columnswatch[i]).offsetHeight>tallest) tallest=document.getElementById(this.columnswatch[i]).offsetHeight } } if (tallest>0){ for (var i=0; i<this.columnswatch.length; i++){ if (document.getElementById(this.columnswatch[i])!=null) document.getElementById(this.columnswatch[i]).style.height=tallest+"px" } } } ddequalcolumns.resetHeights=function(){ this.setHeights("reset") } ddequalcolumns.dotask=function(target, functionref, tasktype){ //assign a function to execute to an event handler (ie: onunload) var tasktype=(window.addEventListener)? tasktype : "on"+tasktype if (target.addEventListener) target.addEventListener(tasktype, functionref, false) else if (target.attachEvent) target.attachEvent(tasktype, functionref) } ddequalcolumns.dotask(window, function(){ddequalcolumns.setHeights()}, "load") ddequalcolumns.dotask(window, function(){if (typeof ddequalcolumns.timer!="undefined") clearTimeout(ddequalcolumns.timer); ddequalcolumns.timer=setTimeout("ddequalcolumns.resetHeights()", 200)}, "resize") This textbook is complete garbage, there is nothing in this thing about this topic at all. Here is the question I am trying to do: "Suppose you have a sequence of numbers Where every number is the previous number plus 3 1, 4, 7, 10, 13, 16, 19, 22 Write a program to output the first 10 number s of the sequence. You must calculate the numbers, you cannot just hard-code them into an array." Its a question on a test study guide. Heres what I got so far: Code: <html> <head> <script type="text/javascript"> VarX = 1 i = 3 VarY = VarX + i count++ do varY while count < 10 </script> </head> <body> </body> </html> Hi, I am using several Javascripts into a html file. Individually all scripts working fine, however when I put them on the onclick event someof them not works. Example: <html> <head> <script> function one; </script> <script> function two; </script> <script> function three; </script> </head> <body> <form type=post action=newfile.asp> .................... ................... ................... <input type=submit onclick="one(); two(); three();"> </form> </body> </html The schema is right? How is the best way to force many scripts working fine? Bob Hi, I need some advice. I wanted to create a 4 by 4 grid in a webpage. Then i want to select a specific box in the grid to flash a certain colour. There will always be a set sequence of the same sections lighting up with the same colours. So row 2 col 2 flashes green, then row 4 col 1 flashes pink etc. With around 5 boxes being used out of 16. How would i go about doing this? Is using Javascript the best thing to use? Any advice would be greatly appreciated. Thanks. Hi there. I'm trying to make a little valentines website 'card' for my ladyfriend. I was going to be clever about it and use javascript, but as it turns out I'm really not that clever with it anymore. I need a single image to change into a different image on each following mouseover event. A planned 'route' of images, for exameple A -> B -> C -> D -> E -> A -> F - > B -> .. and so on. I thought I could do this, but I'm getting nowhere. I did try to look for similar attempts to make this, but it's kind of hard to find since 'mouseover' is such a generic search term. Thanks. Edit: there's little point for me in posting my code so far.. it's just a long list of imagecodes and a little mousover script that would probably make you laugh. I have an autocomplete script but it's currently returning results in a character is in the name anywhere at all, what I need it to do is only return matches if the characters are in sequence only. Example of how it is now if you type S it will return: Science Host Pass What I need it to do is only return a match if the first character is an S, and so on down the line in order. So if you type sam it should only return matches where the first 3 letter are sam in the order it's typed. Here's how the regexp is now: return value.replace(new RegExp("(?![^&;]+(?!<[^<>]*)(" + term.replace(/([\^\$\(\)\[\]\{\}\*\.\+\?\|\\])/gi, "\\$1") + ")(?![^<>]*>)(?![^&;]+", "gi"), "<strong>$1</strong>"); I want the images to change in sequence when the page is refreshed not random like i have below. Can someone help me with this please? Also I also need text to change on refresh to because I am going to have a descritption of the image below. Thanks [CODE] <script type="text/javascript" language="JavaScript"> var imgs = new Array('<a href="VW_1.shtml"><img border=0 src="img/samples/VW/large_1.jpg" width=165 height=109" class="thumbnail_img">', '<a href="fortshelby1.shtml"><img border=0 src="img/samples/Fort Shelby/image1-large.jpg" width=165 height=109 class="thumbnail_img">', '<a href="jaguar1.shtml"><img border=0 src="img/samples/Jag_of_Novi/large_1.jpg" width=165 height=109 class="thumbnail_img">', '<a href="harley1.shtml"><img border=0 src="img/samples/wolverine_harley/large_1.jpg" width=165 height=109 class="thumbnail_img">', '<a href="bc1.shtml"><img border=0 src="img/samples/BC_Coney_Island/large_1.jpg" width=165 height=109 class="thumbnail_img">', '<a href="mama1.shtml"><img border=0 src="img/samples/Pozios_Retail_Mama_Vickys_Coney_Island/large_1.jpg" width=165 height=109 class="thumbnail_img">', '<a href="children1.shtml"><img border=0 src="img/samples/Detroit_Childrens_Museum/large_1.jpg" width=165 height=109 class="thumbnail_img">', '<a href="harper1.shtml"><img border=0 src="img/samples/Harper_Woods_Library/large_1.jpg" width=165 height=109 class="thumbnail_img">', '<a href="dps1.shtml"><img border=0 src="img/samples/DPS_Facilities_building/large_1.jpg" width=165 height=109 class="thumbnail_img">', '<a href="lakeland1.shtml"><img border=0 src="img/samples/Lakeland_School_Huron_Valley/large_1.jpg" width=165 height=109 class="thumbnail_img">', '<a href="auto1.shtml"><img border=0 src="img/samples/Manhattan_Auto_Group/large_1.jpg" width=165 height=109 class="thumbnail_img">', '<a href="maxey1.shtml"><img border=0 src="img/samples/Maxey_Ford/large_1.jpg" width=165 height=109 class="thumbnail_img">', '<a href="benz1.shtml"><img border=0 src="img/samples/Mercedes_Benz_of_St_Clair_Shores/large_1.jpg" width=165 height=109 class="thumbnail_img">', '<a href="metro_lofts1.shtml"><img border=0 src="img/samples/Metro_Lofts/large_1.jpg" width=165 height=109 class="thumbnail_img">', '<a href="mtclemens1.shtml"><img border=0 src="img/samples/Mt_Clemens_Library/large_1.jpg" width=165 height=109 class="thumbnail_img">', '<a href="st_gertrudes.shtml"><img border=0 src="img/samples/st_gertrudes/large_1.jpg" width=165 height=109 class="thumbnail_img">', '<a href="rayconnect1.shtml"><img border=0 src="img/samples/Rayconnect/large 1.jpg" width=165 height=109 class="thumbnail_img">', '<a href="faulhauber1.shtml"><img border=0 src="img/samples/Faulhauber/large1.jpg" width=165 height=109 class="thumbnail_img">'); var max = imgs.length; var num = Math.floor((Math.random() * max)); document.writeln(imgs[num]); </script> [CODE] I built some pages that uses a Flash widget to play mp3 files on my server and show album covers at the same time. However, for people without Flash (like iPhone/Safari), I accommodate them by using a JavaScript that offers a list of simple links to the mp3 files. What I would really like, in the case of a page where there are several songs by the same artist, is a script that when activated, will play all the files in order. Possible? Where would I look for such a script?
I have an essoteric question about javascript and how DOM/javascript stores divs that are created and displayed in succession by absolute positioning. I have a series of divs that are assigned absolute top and left values to form a grid. The grid tiles are programmed to swap coordinates in pairs when one of the pairs is clicked. Then if I do a sampling of the divs by: Code: //returns the same string on every call. //regardless of the coordinate values. which change var GM = document.getElementById('TP'); if(GM.hasChildNodes) { var GMC = GM.getElementsByTagName('div'); var str = ''; for(i = 0; i < GMC.length; i++) { if(GMC[i].hasChildNodes) { for(var j = 0; j < GMC[i].childNodes.length; j++) { var gmc = GMC[i].childNodes[j]; var gmcTxt = gmc.childNodes[0].data; str += gmcTxt; } } } } alert(str); The list does not represent the positions of the divs as they appear in the browser, but in a sequence that is saved in another array when the divs are created. The same is true for document.getElementById('[id assigned each div]') The only way to detect the sequence is to do a long drawn out loop looking for coordinate values, and comparing them to a prestablish template set of values, then looping back through to compare the contents of each div and decide if they are in the right place (visually). The problem is that some divs may have the same content. If the same content appears to be in the right place, the coordinates can be wrong. So I need to detect the content and decide if it is right, regard- less of the coordinates. This has to be done by the program (of course). So the question is: What is javascript doing when it is asked to Code: document.getElementByTagName('[elem]'); In this case are the divs children of the document? (in the case of my project, children of a container div) And why would they not be detected in the order apparent in the browser window? I will post the current version and return and post a reply with the url. http://www.jekillen.com/jekillen/con..._wise_dev.html Hi! I'm very new to Javascript so first I want to apologize for my lack of knowledge, what I'm asking is probably really simple to do. Im have a folder full of images. Each image is named with an incrementing number like vidseq000001, vidseq000002, vidseq000003 and so on. I'm trying to use a jQuery plugin called "reel" to make the sequence animate. For that it seems I need to put the images inside an array. I know how to manually enter each image inside the array like var [ vidseq000001, vidseq000002, vidseq000003, ] But this becomes quite tedious with over thousand images. What would be a smarter way to put all my images inside an array? I have a function below where every time a question is submitted, it will add a new row in the table with a textbox which allows numbers entry only. My question is that I don't know how to code these features in this function: 1: I want the text box to be between 0 and 100, so if text box contains a number which is above 100, it will automatically change the number to the maximum number which is 100. Does any one know how to code this in my function below in javascript: Code: function insertQuestion(form) { var row = document.createElement("tr"); var cell, input; cell = document.createElement("td"); cell.className = "weight"; input = document.createElement("input"); input.name = "weight_" + qnum; input.onkeypress = "return isNumberKey(event)"; cell.appendChild(input); row.appendChild(cell); } I am trying to figure out how to make a random number I can plug into a script count down from that number at certain times of the day until it reaches 0. I would like it to reset itself at midnight every day. I'm trying to make it work with a script I found on here that resets itself at midnight every day. So instead of it counting down too fast, it would count down to the next number after a randomly generated number of minutes until it reaches 0. But it wouldn't necessarily have to end at 0 at midnight. It could go from 845 to 323 at the end of the day at a slower pace. Is that possible?
When I used toFixed() method on a number, I thought that this method round a number to a specified approximation, but I got a surprising result, the number became string! 15.23689 .toFixed ( 2 ) ==> "15.24" So does it convert the number into string? So should I be learning javascript, what am I going to achieve by understanding this language? My background: Designed a website for my wifes shop: http://www.eden-flowers.co.uk Enjoyed the html and css design side of things, then we decided to add a shoppping cart, to see if we could sell a few products online. Used opencart by the way, which I thought was a good free product and reasonably easy to implement. Having looked deeper into the opencart noticed that it used PHP, so I'm thinking I would like to understand this better. And here I am now trying to understand Javascript purely because I use w3schools alot for reference and their next logical step seemed to be Javascript. I'm rambling, but if you care to respond to this very open question, then pls feel free to voice your opinion/suggestions. Im trying to learn how to code but i'm not getting it can anyone help me with java? <3 -ButterFly<3 Code: <HTML> <HEAD> <SCRIPT TYPE="text/javascript"> //Define Functions function student(name,age,mother) { this.name = name; this.age = age; this.mother = mother; this.displayProfile = displayProfile; } function grade(math,english,science) { this.math = math; this.english = english; this.science = science; } function displayProfile() { document.writeln("Name: " + this.name + "); document.writeln("Age: " + this.age + "); document.writeln("Mother's name: " + this.mother + "); document.writeln("Math Grade: " + this.grade.math + "); document.writeln("English Grade: " + this.grade.english + "); document.writeln("Science Grade: " + this.grade.science + "); } </SCRIPT> </HEAD> <BODY> <SCRIPT TYPE="text/javascript"> { student1 = new student("John",18,"Diane"); johngrade = new grade(100,80,90); student1.displayProfile(); } </SCRIPT> </BODY> </HTML> Alright, I am learning javascript and in the middle of experimenting with functions, I don't see why this does not work? I am currently trying to learn the <form> object. Now I have done some things within <form> like setting up text fields with submit buttons, etc.. But now on this part of the course it is showing properties I think, within the decleration of the <form> such as shown below Code: <FORM METHOD="POST" ACTION="/cgi-bin/correct.pl" onSubmit="return false;"> Could someone explain to me what that ACTION="/cgi-bin/corrct.pl" is for along with the onSubmit="return false;" ?? I'd like an explanation of the properties of <form> if you could please. Hi, I'm in the process of learning JavaScript. I picked up a "JavaScript for dummies" book at the library and it wasn't going too well. It was poorly written and made it difficult to understand things in the later chapter. What is the best online resource to learning JavaScript? Preferrably one that is good at explaining format ( I often find myself wondering if certain aspects in my script need ()'s or a "=" sign). For example, HTML has tags and that is what forms the mark up. I know JavaScript has multiple aspects (functions, objects), but I want an online resourcethat properly explains the format of these aspects. Thank you |