I am working on a very simple code to determine the highest value from an array and also use parallel arrays.
The problem I am having is, when I try to invoke the parallel array namesArray it returns undefined.
I have coded the function so it can be used to find the highest value in more arrays as this is only the beginning of my code. Im not sure if this is what is causing the problems but I have a feeling it is code...
I'm using an array to store map features (name, lat, lon, caption,
etc), from which the user can then select an individual feature. The
problem is that when thousands of features are stored in the array,
looping over the entire array looking for a match is SLOW.
So I'm running a hash in parallel, where every time a feature is
pushed onto the array it's name is also added to the hash as an
identical key value pair. I then check if the key is defined in the
hash, and if it is, I want to use that feature's values from the
array. Problem is, I don't know the index number in the array for this
feature. Is there a way to look this up without looping over it, by
matching values between the array and hash? Code:
After some earlier advice I have realised that I was trying to find the highest vale in an array not the index of that value. I have changed my code accordingly but I still have something wrong with it. It still returns undefined.
I need to have the function findHighValueIndex(anArray) as I will be adding more arrays later.
<HTML>
<HEAD>
<TITLE>
</TITLE>
[Code]....
I have 4 arrays that all contain data linked by the index. I have 3 drop down boxes on a web page that give the user 3 ways to search for data. The top one is mandatory the other two are optional. I've managed to create the code to search using the mandatory box but cant figure out how to expand the search.
Here is the function that deals with the search data:
function findFlights(){
var yourAirline = readTheAirline();
var result = 'Here are your flights <BR>';
var choose = 'Choose your destination';
for (var index = 0; index < flightTimes.length; index++){
var flight = flightDestinations[index];
var airline = flightOperators[index];
if (yourDestination == flight){
var b = flightTimes[index];
var c = flightDestinations[index];
var d = flightOperators[index];
var e = flightFares[index];
var message = b + ' to ' + c + ' operated by ' + d + '. £' + e + '.';
result = result + message + '<BR>';
}if (yourDestination == choose){
result = 'Please choose a destination city from the destination menu and then click Find flights again.';
}}displayMessage(result);}
None of my getElementById (or other) references produce anything but "undefined." This occurs in the latest versions of Fx, IE, Chrome, and Safari, so it must be something I am doing but not not seeing here. I have boiled it down to the following without success, and wonder whether there is some add on interaction. Fx 3.6.12 has the problem with this code:
<code>
<html>
<head>
<title>This is a test of getElementById</title>
</head>
<body>
<div id="area" name="area_name">xxx</div>
<script type="text/javascript">
var divs = document.getElementsByTagName('div');
var msg = '';
msg = 'Divs[0] contains ' + divs[0] + ' with width = ' + divs[0].width + "
";
msg +='Test area width by id = ' + document.getElementById('area').width + "
";
msg +='Test area width by name = ' + document.getElementsByName('area_name').width;
alert(msg);
</script>
</body>
</html>
</code>
Here is a clip of code from a script project im working on. Now my document.getElementsByTagName is returning a "undefined" value.
<a href="[URL]" style="text-decoration: none; color: #EDDBAF; font-size: 16px;">
<center style="margin-left: 10px; margin-right: 10px;">
<font style="color: #EDDBAF; font-size: 16px;" id="title"></font>
</center></a>
<li id="name"><a http="[URL]" style="color: blue;">John Doe</a></li>
<script type="text/javascript">
var pname = document.getElementById('name').getElementsByTagName('a');
Now if I remove the ".getElementsByTagName('a')" it will actually work, but it also includes the <a> tag thats within the <li> tag, which I don't want.
document.getElementById('title').innerHTML=pname.innerHTML;
</script>
I have a following snippet
var test = xmlhttp.responsetext
var msg="";
when i print the text as below
[Code].....
I could see the individual values in each index in firefox, but ie is displaying as undefined.
know whether this is not allowed in IE?. Is there any workaround for this?.
I am using getJSON to get results from a different domain and i wantedto get _some_ object back when calling getJSON so that i can insertsome variables into the callback scope.Basically, what i wanted to do was this:
var new_json = $.getJSON(url, function(data) {
alert
(this.variable_from_caller);
[code]....
I have a function where in I call another function that assigns a value to a var. code...
For some reason my code below is returning 'undefined'. But when I place an alert(); before the 'return' it shows the correct value. However when I place an alert(); to show the var that is set to what the function returns it says 'undefined'.
Firebug throws no errors. I am using a little bit of jQuery.
I can not for the life of me get an ajax example/tutorial to work. I have tried dozens including prototype library and JQuery.
Here is my latest attempt:
As you can see I am trying to alert the variable teamH but I keep getting an undefined in the alert. I also tried a static drop down and I received the same undefined alert.
How I get that variable to contain my drop down choice?
Using jQuery v1.4.2, Firefox 3.6.6, Chrome 4.1, IE 6,7,8.
I'm using jQuery .css() function to get the value of the css attribute "background". The attribute has not previously been assigned a value (either in script or style sheet).
e.g. alert($(this).css("background"));
In Firefox and Chrome, the return value is an empty string (""). However in IE 6,7,8, the return value is "undefined".
It also makes the following statement impossible:
alert($(this).css("background").indexOf("somepic.gif"));
Because css() in IE doesn't return a blank string, doing indexOf() raises an error.
cross-browser scripting compatibility, for jQuery to return a blank string *for all browsers* if the css attribute isn't set. Otherwise we have to check for both "" or "undefined" which is the sort of pain jQuery users are trying to avoid.
if it's possible to return an array from my php generated content to ajax's responseText. I tried echoing back the whole array variable but can't seem to fully receive it in javascript.
somewhere in file1.php
<?php
$myArray = array();
$myArray['name'] = "ajax tech";
$myArray['age'] = 20;
[Code]....
I have a function that requires the ability to count the number of entries in an array.
I'm using the following to call my function inside an input tag:
Here is the javascript:
And when errors.length is alerted, it outputs 0. I can only figure that there is an issue when using custom named keys in an array, since this works when I use only integers, however, I have the need to use a custom key index as shown.
var toSearch = "I Wish This Worked. What Is The Issue?";
var pattern = /is/gi;
result = pattern.exec(toSearch);
alert(result.length); Shouldn't this be 4, not 1?
/*while((result = pattern.exec(toSearch)) != null)
alert(result[0] );*/
The commented out code works to access all instances of 'is'. But what's the point of returning an array if you're only going to use one index(0)? You'd have to manually code to get a full array of the returns, doesn't that defeat the purpose?
in javascript, is there a way to test if an array is undefined????
eg...
for (var x=0; x<10; x++){
if test_array[x] is undefined then x++
document.write(test_array[x])
var allProductIDs = [5410, 8362, 6638, 6758, 7795, 5775, 1004, 1008, 1013, 1014, 1015, 1072, 1076, 1086, 1111, 1112, 1140]; lastProductID = 6758;
for some reason I get a -1 or I guess which is equivalent to not found for this:
alert(allProductIDs[allProductIDs.indexOf(lastProductID));
I can't figure out for the life of my why because it should find 6758 and that would be index 3. If it's index 3 then I should get back 6758 I would think.
I have a homework assignment which is pretty simple. It is a grade calculator that uses arrays to gather the grades from the user. This is what I have for the problematic section:
var homework = new Array(2);/* The grades entered by the user for Homework 1, 2, and 3 */
var project = new Array (3);/* The grades entered by the user for Project 1, 2, 3, and 4 */
[Code].....
My problem is the document.write portion of the code, where it is supposed to return either homework[0], project [0], or exam[0], it instead returns undefined. There is no problem with any other subscript. And yes, it does successfully prompt me for each of the [0] subscripts in the first part of the code. Am I just missing something that is right in front of my face? Does all arrays not start with the [0] subscript?
what is the reason for the undefined answer?
<head>
</head>
<body>
<script>
var numberstring = "123 456 789";
document.write(numberstring);
var matchnumber = new Array();
matchnumber = numberstring.match(/d+/g);
alert (matchnumber.lenght);
</script>
</body>
The form allows users to enter there details, and when they click on the signup button the following is suppose to happen
1. Thank you note for signing up is displayed, including details they just entered
2. The details entered are stored in an array
3. When you want to view all signups you can click on a signup button and all details are shown
4. The form resets and clears all input fields
I have a form that allows input and functions that validate input, store input, and shows the input and html for the design layout. [code] The two buttons are called signup and members [code]When i run it i can enter all the details and click on signup all the details are still there and then i click on members and it shows all the details i have just entered along side the string signup but it also displays the words 'undefined', so I think there are problems with the array.
I keep getting <undefined> when I alert out the value of my array 'fadeimages1'. Using php/mysql I retrieve filenames from a directory and create <INPUT> fields to store the filenames. In the javascript portion of the code, I use getElementsByName() to retrieve all of the <INPUT> fields. I then declare an array, 'fadeimages1'. Next, using a for loop I try to copy the values from the <INPUT> fields into the array 'fadeimages1'. When I alert out the length and value variable for each <INPUT> field, I get the correct filename, but after trying to store the value into 'fadeimages1' array, I get value is <undefined> when I alert it out. BTW, the following code uses 'fadeimages1.push()', but I also tried 'fadeimages1[i]=...'. Both result in <undefined> values.
[Code]....
I have been directed from .NET section to this section. My original post and question are here. forums.devshed.com/net-development-87/asp-net-how-to-send-data-to-parallel-port-600691.html
Is it possible to send data to parallel port using javascript?
What I have been given is two arrays and I need to multiply the elements in the first with the corresponding value in the second and then save the result into a third array. I have tried every option i can think of to do this, I entered the result values into the third array just to check the rest of my code is right
View 6 Replies View RelatedI have a function called 'loadScript' which is used to load JavaScript files in parallel (for the purpose of not blocking the browser from downloading other components at the same time).
See the following link for more information on the subject:[URL].. This function works fine for IE and Firefox and up until today has always worked for Chrome/Safari. But today I noticed an issue for WebKit rendering engines, which is that sometimes the callback method I pass to the loadScript doesn't always fire, only sometimes when I force refresh the page.
[Code]...
I'm trying to build a page that has multiple ajax calls on it. When you do it the old-fashioned way with XmlHttpRequest, you'd create a new xhr object for every call so that they execute simultaneously. If I try to do this in jquery it will only execute a call when the previous one has completed. This makes the page load time completely unacceptable. How to improve the performance?
View 2 Replies View RelatedI use ASP to write the arrays at the start of my page:
<script language="Javascript">
var ArrManu1 = new Array();
var ArrManu2 = new Array();
var ArrManu3 = new Array();
[Code]....
...to populate the second dropdown box. However, when the user selects the first option in the first dropdown box (therefore making the variable "Co" equal to 1), ((ManuArr[Co-1])[i-1]) is "undefined" - why doesn't it add "Bell" to the dropdown?
here's what we have in an html file.
<form .....
<input type=button name="comment" onclick=" prompt('enter comment','
' )" >
Is there anyway to get the value returned from the prompt in the statement
above, into the value of the statement below ?
<input type=hidden name="comment_text" value = ???? >
We would like the user to click the "comment" button, have another window
popup where they enter their comment, and then take the comment text and
append it to the value parameter of the hidden statement.