|
JavaScript - How To Check If Variables Are Integer
Similar TutorialsCan someone point me in the right direction for using Javascript to increase a number over time without refreshing the page? I also need it to continually go up, and not start at 0 on every refresh. Is this possible? Blockis Frustrated by the fact that you don't have the integer division operator in JavaScript? Here's a surprisingly little known method: parseInt(19/4) = 4 Now when a VBguru or vbscripter says "ha ha, I can integer divide and you can't!" You now know better. Hi all, this is my first post to this great useful forum. I have a javascript 2d array [x,y] that contains integer values like this: [0,0], [0,1], [0,2], [0,3], [1,0], [1,1], [1,2], [2,0], [2,1], [2,2], [0,-1], [0,-2], [0,-3], [1,-1], [1,-2], [2,-3] my question is how to get the max,min y value for each x. for the sample above it should give me another array with the following results [0,3],[0,-3],[1,2],[1,-2],[2,2],[2,-3] your help is highly appreciated Regards Omran In some cases toPrecision(X) will result in an integer value, which is the expected result. However, it is typical in some fields to always follow the integer value with a decimal and zero (i.e 522 --> 522.0). Technically, this would be incorrect since it would imply an extra digit of precision that does not exist. However, this is often disregarded, provided there are sufficient number of digits (i.e. precision of 5+). That said, is there any way to force an integer result to have a trailing ".0"? Hi, I was hoping you could help me, I was wanting to write text to the screen but without re-writing the whole screen (e.g. document.write();. I wish to take text and put it in a function, modify it, then display it. So far I have: Code: <script type = "text/javascript">
function calculate(text){
var x = "10.0";
var gpa = text.replace(/0.0/g,x);
document.getElementById("text").innerText=gpa;
}
</script>
<p id = text >Your Grade Point Average (GPA) is: 0.0</p>
<button type="button" onclick="calculate(text)">Calculate</button>
Your help would be really appreciated Hi all, I am having a problem converting a physical string to a integer. I have a dropdown list of a few items but are numbers though in chracters. I ned to output the value and the text of the selected item. As I cannot use a if-else statement, any help would be great. Code: <select id="std_num" onchange="displayValue()">
<option value="Two">Two</option>
<option value="Zero">Zero</option>
<option value="Five">Five</option>
<option value="Three">Three</option>
<option value="Two">Two</option>
<option value="Zero">Zero</option>
</select>
Code: function displayValue()
{
alert(document.getElementById('std_num').value);
var c = (document.getElementById('std_num').value);
}
OVERVIEW of main webpage: when a user logs in, they will be directed to the main page of the website; and will see images displayed according to a value that was stored in the database. the main page preloads an image array: Code: <script type="text/javascript">
var img_FILE = [ 'images/house.png',
'images/car.png',
'images/boat.png'
];
</script>
easy enough the database holds a column of integers that are used to access the proper image in the array. i can successfully pull the integer value i need from the db. what i want to do is when the main page loads, i want the value that was pulled from the database to be used to display the correct image. example: lets say i pulled the value 2 from the db. then i want to display img_FILE[2] on the main page when the page "loads". Code: <body>
<div id="quadrantOne">
<img id="firstImg" src="images/blankImg.png" width="190" height="235" />
<script type="text/javascript">
$.post('imageScript.php', 'data=0', function(data,status){
if (status == 'success') { imgValue = data }
else { imgValue = 'error' }
document.getElementById('firstImg').src=img_FILE[imgValue];
});
</script>
</div>
</body>
i debugged imgValue and it is correctly assigned the value coming from the db. but..........the image won't appear on the main page. any ideas how to get this to work? thanks, Paul Williams Does JavaScript have an easy of converting an ordinary integer like 135 into a time format like 02:15? I'm working on a timer that handles the backend with just a plain integer that counts down every second but it needs to output looking like a clock.
Another homework assignment that I can't quite seem to get to work... I've been asked to do the following using javascript: -Create a function named randInt() with one parameter of "size". Declare a variable named "rNum" equal to a random integer between 1 and the value of the size variable. Return the value of the "rNum" varialbe from the function. -Create a function named getQuote() with one parameter anemd "qNum". The function should create an array named mtQuotes with five quotes; there should be no quote for the array index "0". Return the value of the mtQuotes array for the qNum index. - In the div element of "quotes" insert a script with the following commands: Declare a variable named "randValue" which is euqal to a random integer between 1 and 5 (use the randInt() function). Declare a variable named "quoteText" containing the quote whose array index value is equal to randValue. Write the value of quoteText to the web page. Here is what I have...it returns undefined. thanks. Code:
<html>
<head>
<script type="text/javascript">
function randInt(size) {
var rNum=Math.ceil(Math.random()*5);
return(rNum);
}
</script>
<script type="text/javascript">
function getQuote(qNum);
var mtQuotes = new Array();
mtQuotes[0] = "";
mtQuotes[1] = "I smoke in moderation, only one cigar at a time.";
mtQuotes[2] = "Be careful of reading health books, you might die of a misprint.";
mtQuotes[3] = "Man is the only animal that blushes or needs to.";
mtQuotes[4] = "Clothes make the man. Naked people have little or no influence on society.";
mtQuotes[5] = "One of the most striking differences between a cat and a lie is that a cat has only nine lives.";
return mtQuotes[qNum];
</script>
</head>
<body>
<div id="quotes">
<script type="text/javascript">
var randValue=randInt(5);
var quoteText=getQuote(randValue);
document.write(quoteText);
</script>
</div>
Well I have an array and a button to select a random integer from the array, how do I make it so that it selects every integer once til all are selected, then it starts over again? For example, an array has these: A B 1 2 Q F So you press the button a number of times, and you get: Q B 1 F A 2 Instead of: 1 Q A 1 B A I have some asp:radiobutton lists that need to update a label with the sum of their values each time a user selects a new value. I am brand new to javascripting and would like some insight on how to get this done. I have inserted my code below. Code: <asp:Label runat="server" Text="Greeting:" /> <asp:Label runat="server" ForeColor="Red" ID="lbl_GreetingScore" Text="0" /> <asp:RadioButtonList ID="rdb1_1" runat="server" RepeatDirection="Horizontal"> <asp:ListItem Selected="True" Text="N/A" Value="4" /> <asp:ListItem Text="Yes" Value="4" /> <asp:ListItem Text="No" Value="0" /> </asp:RadioButtonList> On this webpage http://www.corkdiscos.com/testimonials.html i have a like button. when a user clicks like a comment box appears. when i unlike the button the comment box disappears this is ok but when a user has already liked the facebook page and comes to my webpage the comment box does not show. so im looking for a piece of javascript to check if a user has like the button on my page and if so to show the comment box. please check my source code of the website http://www.corkdiscos.com/testimonials.html to see what i have so far. any help would be greatly appreciated Hi guys. I'm working a bunch of pre existing code on a CMS. Just after a quick fix. Doing a show/hide thing on a particular div somewhere on the page depending if a checkbox is ticked or not. Currently there is 3 checkboxes that are dynamically added through the CMS. Here's simplified version of the form: Code: <form id="simplesearch" name="simplesearch"> <input type="checkbox" onclick='showhidefield(this.value)' name="meta_data_array_search_criteria[custom_profile_type][]" value="5" class="input-checkboxes" /> <input type="checkbox" onclick='showhidefield(this.value)' name="meta_data_array_search_criteria[custom_profile_type][]" value="4" class="input-checkboxes" /> </form> And here's the javascript I was playing with. Code: function showhidefield(id)
{
if(document.simplesearch.meta_data_array_search_criteria[custom_profile_type][''].checked) {
document.getElementById("profile_fields_wrapper_" + id).style.visibility = "visible";
}
else
{
document.getElementById("profile_fields_wrapper_" + id).style.visibility = "hidden";
}
}
Problem I'm having is how do i do a check to see if those checkboxes are checked in the javascript with those name arrays? How do i separate them? 'm guessing I have to loop through them or something?Hopefully that make senses - it's late here and I'm losing the plot Any pointers would be gratefully welcomed this code is supposed to ask the users name and say how many letters in it get 2 random numbers ask user to add them if right say Well Done! if wrong say Sorry, you are wrong. when i run this nothing comes up whats wrong? thanx Code: <script>
var firstName = "";
var numLetters = 0;
firstName = prompt("Hi, what's your first name?", "");
numLetters = firstName.length;
alert ("Did you know there are " + numLetters + " letters in your name?");
var num1 = Math.floor(Math.random()*9) + 1;
var num2 = Math.floor(Math.random()*9) + 1;
var answer;
var useranswer;
answer = num1+num2;
useranswer = promt("What is" + num1 + "+" + num2 + "?");
If (answer = useranswer)
{
alert("Well done!");
}
else
{
alert("Sorry, you are wrong.");
}
</script>
I have a text input box that resets to blank when the user enters an alpha character, it also checks for the number 0 as it has to be greater than 0 too... when I submit the form it is blank the variable changes to blank (as I use parseInt to convert it to an integer at a later stage) What can I do to check and see if it is NaN value? (I've tried isNaN() and it did not do what I wanted it to) Hello, I have never used javascript before, so this might be a very basic question. I have a script on my blog which places a stumbleupon button on the page. This is the code that calls the script: Code: <script src="http://www.stumbleupon.com/hostedbadge.php?s=5"></script> Today I went to my blog and it was taking a long time to load, it turns out because stumbleupons site is down so the script can't be accessed. A whole lot of other stuff on the page just doesn't load until it times out though, so it takes like 3 minutes for the page to load. What I want to know is can I test if the script is reachable and only call it if it is, so that if there is a 403 or 404 error it just won't even try to load it and continue loading the rest of the page?? Any help is greatly apprectiated! Thanks. I have been banging my head on the wall with this one for a few hours. I mostly only program bash so this is a new world for me. I am trying to have a script check a list of zip codes(preferably from a file) and if it is there it passes it to an order page and if not it goes to another URL. The basic idea is to check if you are within a service area before you can purchase a product. I have gotten nowhere fast with this so any help you can offer would be appreciated. Hello, today I am trying to allow a user to easily uncheck/check all checkboxes in a form by checking or unchecking a checkbox. The checkboxes would be in a form like so: Code: <form action="" method="post"> <input type="checkbox" name="checked[]" value="1"> <input type="checkbox" name="checked[]" value="2"> <input type="checkbox" name="checked[]" value="3"> <input type="checkbox" name="checked[]" value="4"> </form> I use an event handler to call a function: Code: <input type="checkbox" name="checkall" onchange="checkall('checked[]', this.checked)">
And here is the function: Code: function checkall(box_name, current_state) {
all = document.getElementsByName(box_name);
action = (current_state == "checked") ? "false" : "true";
for (i = 0; i < all.length; i++) {
all[i].checked=action;
}
}
The event handler should pass the name of the checkboxes and whether the "check all" checkbox is currently checked or not to the checkall() function. Nothing happens when I check/uncheck the "check all" function. Help? plz check bold part of function is not working. what is wrong with it.? Code: function onesizecheck(chk_id,siz) {
alert(chk_id);
if(document.getElementById('siz_check').value=='')
{
document.getElementById('siz_check').value=siz;
}//end if
if(document.getElementById('siz_check').value==siz) {
document.getElementById('siz_check').value=siz;
}
else {
alert('Multi size are not allowed.');
for(var i = 0; i < document.delet['checkbox[]'].length; i++){
var cb = document.getElementById('checkbox');
alert(cb[i].value);
}
}
}//end function
|
|||||||