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JavaScript - How To Tell If Input Is Variable Or Just String?
I am making a function where I need to know whether the input is a variable with a string value
var foo = "bar"; Function(foo) or if it is a string, wherein it would be the name of an object object = { ThingsInside: function(){code} } Function('object') Code: function Function (object){
if(object is a string){
do this
}
else if (object is a variable with a string value){
do this
}
else{
do something else
}
Because they would be both passed by value, I'm not sure how or if there is a way to tell as they would both just appear as string inputs, right? Similar TutorialsI have a problem thats above my head, im new to javascript. I want to be able to control the first three characters of an input string on a login form. If a user types GP15555 or JP15555 I want it to change to GPL5555 or JPL5555 respectively changing the "1" to an "L" on the prefix is this at all possible? any point in the right direction would be great. heres my code Code: </script>
<script language="JavaScript" type="text/javascript">
//<![CDATA[
function Login(form) {
var password = form.password.value;
var pin = form.pin.value;
var product = form.product.value;
if (password) {
var htsite = product + "/" + password + "/" + pin + "/index.html";
window.location = htsite;
}
else {
alert("Please enter your password and pin.");
}
}
// End -->
//]]>
</script>
/thanks gp Utilising "Search" what resides at: http://www.codingforums.com/showthread.php?t=6441 appears to be closest to my problem but does not solve it. I want to use HTML Input text boxes for processing within nested functions and with the results output back to the HTML table. The code contains the HTML and Javascript. As the code stands data is reported back to the HTML table because the wanted functions have been commented out. Within the code is a note regarding the above. If I try to engage the functions add() or take() I have "NaN" returned. I have attempted to use x=Number(yy), x=parseInt(yy), but to no avail. [code]<html > <head> </head> <body> <form id="myself"> <table border="1" bgcolor="lightblue"> <tr height="25px"> <td id="ad" width="25px"></td> <td id="sb" width="25px"></td> </tr> <tr height="25px"> <td><input id="lt" type="text" value="" onChange="calc();" style="width:20px"></td> <td><input id="rt" type="text" value="" onChange="calc();" style="width:20px"></td> </tr> </table> </form> <script language="javascript"> var mm; var nn; var tot; var subt; function calc(){ var n1=document.getElementById("lt").value; var n2=document.getElementById("rt").value; var nn; var mm; nn=Number(n1); mm=Number(n2); tot=mm+nn; // comment these lines out and ad.innerHTML=tot; // activate the functions subt=Math.abs(nn-mm); // sb.innerHTML=subt; // mm and nn need to passed to the functions //add(); //take(); } function add(){ tot=mm+nn; ad.innerHTML=tot; } function take(){ subt=Math.abs(nn-mm); sb.innerHTML=subt; } </script> </body> </html> [icode] Hi, I am trying to write some code that will test if a user enters a non-numeric character in an input text field, and if so, replaces it with a '0' Code:
<script type="text/javascript">
function IsNumVal (){
for (J=1; J<=3; J++){
if (isNaN(Number(document.getElementById('Intext' + J).value))){
document.getElementById('Intext' + J).value = 0;
}
}
}
</script>
<Body>
<table border="1" cellspacing="1" id = "Numbers">
<tr id="RowNum1">
<td ><input type="text" size = "5" name="Intext1" id="Intext1" value = "3"
onkeyup="IsNumVal()" /></td>
</tr>
<tr id="RowNum2">
<td><input type="text" size = "5" name="Intext2" id="Intext2" value = "9"
onkeyup="IsNumVal()" /></td>
</tr>
<tr id="RowNum3">
<td><input type="text" size = "5" name="Intext3" id="Intext3" value = "18"
onkeyup="IsNumVal()" /></td>
</tr>
</table>
</Body>
document.getElementById('Intext' + J).value = 0; doesn't work document.Schedule.'Intext' + J.value = 0; doesn't work document.Schedule.Intext2.value = 0; works, but I need to test each text field while looping, so I can't "hard code" the ID. Suggestions? I am creating a program that will give you the nutritional value's of the McDonalds menu and I am in need of help to gather the information from the input bar and turn that into a Javascript variable using javascript, the code below is the form, input box, and the case/switch that I would like to use to create this, Thanks in advance! Code: <form id="help">
<input class="sb" id="life" type="text" placeholder="What food would you like to check?">
<button type="submit" class="button">Submit</button>
</form>
<div id=cci>
<script>
var item = document.getElementById("help");
var food = item.toLowerCase();
switch (food) {
case 'big mac':
document.write('<br><br><br>');
document.write('Big Mac');
document.write('<br><br>');
document.write('Calories: 530');
document.write('<br>');
document.write('Carbohydrates (g): 47');
document.write('<br>');
document.write('Total Fat (g): 27');
document.write('<br>');
document.write('Cholesterol (mg): 85');
document.write('<br>');
document.write('Dietary Fiber (g): 3');
document.write('<br>');
document.write('Sugars (g): 9');
document.write('<br>');
document.write('Protein (g): 24');
break;
default:
document.write('<br><br><br><br>');
document.write(food);
document.write('<br><br><br>');
document.write('The food is not recognized');
document.write('<br><br>');
document.write('Double check your spelling');
break;
}
</script>
</div>
How can I use a string to select a variable? E.g. Code: function load_menu( menu ) {
//Availible menus
var login = Array('Login','Register','Recovery');
var settings = Array('Profile','Account','something');
//Menu container ID's
var cons = Array('menuitem1','menuitem2','menuitem3');
for ( var i = 0; i < cons.length; i++ ) {
document.getElementById(cons[i]).innerHTML = menu[i] ;
alert(menu[i]);
}
}
"menu" is "login". menu[i] should reference the "login" variable and then put one of the values for the login variable array in its place. If you understand what I mean? So if menu is settings then the settings array would be used. Hi all, I am having a hard time on this, can you help pls? I have this code? $("select[name=objeto"+contcheck+"]").change(function(){ $("select[name=titulo"+contcheck+"]").html('<option value="0">Carregando...</option>'); where contcheck is a counter, so a number. It does not work at all, any help how to concatenate string and variable like this: objeto1 objeto2 objeto3 .... and so on. Thx. Say I had a bunch of elements with id names "id1", "id2". "id3" etc. Then say I had a function that adds a click handler such that when you click these elements it gets the id name with this.attributes[1].nodeValue;. Then say I had a bunch of arrays with the same names as the ids var id1 = ["data", false, 45]; var id2 = ["otherdata", true, 15]; var id3 = ["otherotherdata", null, 65];. How would I set a variable "currentid" to the array with the corresponding name as the id name? I guess the underlying question is, how would I convert a string to a variable name?
Here is my code Code: function copy_grid(from,to)
{
var copy_from = from +"_24_product_cost"; // in this instance from = grid1_White
var copy_to = to;
var tmp_field = getElementById(copy_from).value; // ERROR: getElementById is not defined
}
document.product.grid1_White_24_product_cost.value // works as expected but I wanted this to be dynamic. Any ideas? I'm sure it's just a syntax problem. You can ignore most of this function because most of it works. The part I'm asking about is the "coordinates" variable 4th line from the bottom. The "office3" variable is a dynamically populated office number. I have the office numbers all defined as variables somewhere else but since I can't just name the variables as numbers I had to put a $ in front of them. Basically I'm trying to call the office number variable, $1656 for example. So "coordinates" is meant to be equal to "$+the chosen office number". Problem is coordinates is coming up as literally "$1656" instead of the value of $1656. Sorry if that was confusing, can anyone point out the problem? function display(name3,office3,officePH3,mobile3,email3) { var instruct="<span class='style4'><strong>"+"LOOK FOR THE FLASHING COMPASS ROSE ON THE MAP"+"</strong></span>"+"<br /><br />"+"<span class='style4'><strong>"+"HOVER ON A PRINTER TO VIEW ITS INFO OR CLICK TO MAP IT"+"</strong></span>" var info_output="NAME: "+(name3)+"<br /><br />"+"OFFICE: "+(office3)+"<br /><br />"+"DESK PHONE: "+(officePH3)+"<br /><br />"+"MOBILE: "+(mobile3)+"<br /><br />"+"EMAIL: "+"<a href=mailto:"+(email3)+">"+(email3)+"</a>"+"<br /><br />"+(instruct) document.getElementById("info").style.visibility="visible"; info_text.innerHTML=info_output document.getElementById('iframe_container').style.overflow='auto' document.getElementById('viewer').src=('Location_Files/')+(office3)+('.htm') var coordinates='$'+(office3) document.getElementById('compass_rose').style.top=('200') document.getElementById('compass_rose').style.left=('200') document.write(coordinates) } Hi All, Am new to Javascript but fluent in C++ and other languages, I have a query, i made a global variable to hold string information, can the value of this string be assigned to a form input field value? I mean in the 'default value sense' I am just wondering if there is any syntax to accomplish this. EG in my javascript i have the string nameVal; It is a global variable, i would like to know if it is poosible access its value for use in the line below shown with italics, or is it basically always a case of 'type the value in manually yourself' and then rely on events functions to update the field thereafter? Code: Name: <br><input type = "text" name = "nameField" size = "50" value = my string val here onChange ="this.value=storeVal(this.value, '0')"></input></br> Is this possible? Code: String.prototype.trim = function(){
return this.replace(/^\s+|\s+$/g, "");
}
var myStr = " Hi what's up? ";
myStr.trim();
alert("{" + myStr + "}"); //will result in the original string, not the trimmed version
It's possible with numbers: Code: var myNum = 10; myNum++; alert(myNum); //11 I am just starting to learn javascript and was hoping someone might be able to answer my question: var months = "April Showers"; document.write('<p><img src="ad11.jpg"); document.write(" alt="); document.write(months); document.write(">"); document.write(months); How come when I display my output to a browser without the presence of the ad11.jpg file, only the first word (April) in the text string "April Showers" is dispayed where the .jpg file is suppose to be...but the last line displays the entire text string. Hi, I have a javascript program that currently takes the contents of a *.txt file and converts it to a string-type variable using a hidden iframe. For my pruposes it would be much nicer to read a *.csv file instead, however the method I'm using creates the "open/save file" pop-up window. All files are client-side and in the same folder on one computer; this is NOT server-side or internet-based. It is simply javascript used in an HTA file as programming code. The *.csv does not need to be edited, just read. I need to know how to convert the text of this *.csv file into a string variable. I have heard of using "xmlHTTPRequest (AJAX)" but am not familiar with how to use this. Any advice or code would be greatly appreciated. Hello I'm using simpleCart() javascript shopping machine for my page. The script accepts values in a specific syntax: Code: onclick="simpleCart.add('name=Some name','price=23.4','quantity=1');"
But because the price of the product is not always the same but comes up after previously made calculations, i want to parse the values in simpleCart() through another function. I have made the following one which gets the price from a textbox (resultAlmires) of a form (Almires), then converts it to american format (. instead of ,) makes it have one decimal only and finally parse it to simpleCart() with the use of a variable. However it doesn't seem to work: Code: function addAlmiri() {
var timi = document.Almires.resultAlmires.value;
timi = timi.replace(/\,/,".");
timi = timi.toFixed(1);
simpleCart.add( 'name = Some name' , 'price = timi' , 'quantity = 1' );
}
Any help? I need to declare a variable (astString) and initialise it with a string of asterisks. astString needs to be the same length as another variable (otherString). otherString changes it value regularly so I think I need to use the .length property in some way but I can't see how! This should be simple but it's eluding me completely. Hey, I'm looking for a way to get a variable from a parent window in a child window. I'm aware that you can write the variable to a hidden field and then get the field's value in the child window, but I'm looking for a cleaner (all JS preferable) way of doing this. Something like this, but I believe this is an out-dated solution: Code: var str = window.opener.str; alert(str); Any solutions? Hi, my first question on this forum is I hope a simple one. I have an input text field that I would like to have either the user fill out but also I would like to be able to fill it with text, which I can do, via javascript or a variable which I don't seem to be able to manage. I have tried lots of options, converting to a string first and much more but it will not work, maybe it is a syntax error or maybe I am just doing it plain wrong. I think it should be simple but I have only been using javascript for a few weeks so who knows, hopefully one of you! Here is my code for displaying a variable which does not work: Code: <html>
<head>
<script type="text/javascript">
function myfunction()
var mynumber = 101;
document.getElementById("myinput").value = mynumber;
</script>
</head>
<body>
<p id="demo">Web Page 1</p>
<button type="button" onclick="myfunction()">JS</button>
<input type="text" value="00000000" id="myinput">
</body>
</html>
I would be very grateful for any help. Thanks Simon the title kind of sums it up... if I have an array of equations (I'm guessing they should be strings but they don't have to be) and a user-defined variable can that variable be used for the "x" in the equations? I already did the easy part ... Code: <!DOCTYPE html>
<html>
<head>
</head>
<body>
<input onkeyup="solve(this.value)" /><br>
<input id="box0" /><br>
<input id="box1" /><br>
<input id="box2" /><br>
<script type="text/javascript">
var equations=["(x*9/5)+32","x+273.15","x-50*(8/13)"]
function solve(val){
for (var i = 0; i < equations.length; i++) {
document.getElementById("box"+i).value= //ummm...
}
}
</script>
</body>
</html>
Hi all, I'm having some trouble with the this... I have a PHP based calendar where the cells will change color depending on the number of clicks.. this all works fine, but is pointless if I can't send the outcome along in an email. I can do this with PHP but first need to get the values into a hidden field. This is what I have: Code: <script type="text/javascript">
function countClicks (obj){
if (!obj.count) {
obj.count = 0;
}
obj.count++;
if (obj.count > 4) {obj.count = 1};
if(obj.count == 1){
obj.style.color='#FFFFFF';
obj.style.backgroundColor='#66CC33';
obj.parentNode.style.backgroundColor='#66CC33';
document.getElementById("availability").value='Available';
}
if (obj.count == 2){
obj.style.color='#FFFFFF';
obj.style.backgroundColor='#FF0000';
obj.parentNode.style.backgroundColor='#FF0000';
document.getElementById("availability").value='Not Available';
}
if (obj.count == 3){
obj.style.color='#FFFFFF';
obj.style.backgroundColor='#FFCC33';
obj.parentNode.style.backgroundColor='#FFCC33';
document.getElementById("availability").value='Working';
}
if (obj.count == 4){
obj.style.color='#000000';
obj.style.backgroundColor='#FFFFFF';
obj.parentNode.style.backgroundColor='#FFFFFF';
document.getElementById("availability").value='Not Set';
}
}
</script>
and... Code: echo "<input type=\"hidden\" name=\"availability\" id=\"availability\" value=\"\">"; All I'm trying to do is populate value with either 'available', 'not available', 'working' or 'not set'... however, it is worth noting that each cell may have a different value, e.g. 1 cell might be working while the other is not available... so i need to pass the values of all the cells. Can anyone help me out here. Many thanks, Greens85 Hi! I am quite new to the world of JavaScript as I have done basic corse for it... and I have learnt that best way to understand it is to play around with it... but now I am stuck with on of the problem!! Problem: How can we assign text box input values by user to a variable and display that variable back on another element of the same HTML document(dynamically)... Conditions: The value has to be stored as a JavaScript variable only. No server-side script is to be used and has to be done locally. Please help! |
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