Question About Javascript Variables
Feb 23, 2006
I was just reviewing some javascript pop up window functions on my website and I descovered something... that I set the exact same variable name twice for both functions... which is bookWindow. I tested this for pages that use both functions and both types of pop windows work no problem. Is there a problem in that I use the same variable name twice? Is this considered bad form? Or maybe it makes not difference at all because the variable only gets used when it is
called upon and then it leave memory.....
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May 6, 2006
I have a program written in Javascript and fully functioning which takes a user-selected directory name and then displays all the photos in that directory in a certain format.
I am now wanting to expand the program to allow users to optionally enter their own strings and the program will use all the photos from www.flickr.com which use that string as a tag.
I have a PHP interface to flickr (called PHPflickr) which collects all the relevant photo urls. I now need to get these images back into my Javascript so I can process them using the existing functions (rather than rewrite all my functions in PHP code and have two sets of functions in the program). I found on another thread a means to do this for a date variable:
var jsArray = new Array(
<?php
$length = count($monthDataArray);
for ($i = 0; $i < $length; $i++)
{
echo '"' . addslashes($monthDataArray[$i]) . '"' . (($i < $length - 1) ? ',' : '') . "
";
}
?>
but being completely new to PHP I'm not sure what "addslashes" might be or what formatting will be necessary if I am starting with an array of urls. Code:
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Feb 4, 2006
I have the following javascript function: Code:
function updateParent(dvalue, dfield) {
var field = dfield;
window.opener.document.form.field.value = dvalue;
alert("Value: " + dvalue + " Field: " + field);
self.close();}
I'm calling it as so:
<a onClick="javascript: updateParent(30,'image_id');">Update</a>
But I get the following error:
Error: window.opener.document.form.field has no properties
Why is it not picking up that I have defined the variable field as image_id?
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Jul 23, 2005
I need to pass a javascript to JSP code but I cannot figure it out.
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Jul 23, 2005
Does someone know how can we bring variables from a PHP script to a
Javascript one ?
I have to build a Javascript function that needs variables generated by a
PHP script but i do not know the way to retrieve them into Javascript.
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Oct 30, 2006
I have some image data in a Javascript variable, and I want to display
it. I have a technique which works in Firefox but not in Internet
Explorer :
<script>
var testImage = <image data as a string>
</script>
<img src="javascript:testImage"></img>
I understand that this should work in Javascript 1.2 and above, which
supports null characters in strings. Does anyone know why this doesn't
work in Internet Explorer?
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Jul 20, 2005
can anybody put forward a sensible argument javascript's behaviour of
creating a new global variable whenever I assign to a previously undeclared
variable. I can't beleive this is just for the sake of convenience (surely
we learned this much from basic).
here's my proposal: all "global" (document scope) variables must be declared
by 'var' outside a function block.
failing that, does anyone know any patterns or tricks I can use to make sure
I don't create a new global variable when I accidentally misspell a variable
name?
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Jul 20, 2005
Here's the situation. I have a static html page which we want to update
to include some dynamic content. I want a counter that keeps track of
the number of times anyone presses the "add" button, and display that
number. So, that page would look something like:
Number of calls today: 5
Add | Reset
The "5" would increment with every click of the "Add" link. The "Reset"
link would reset the counter to 0.
I have a Perl script that does all of the accounting stuff (opens a file
that contains the number, increments it, resets it, etc). What I don't
know how to do is to get the data from the CGI script to the web page.
I'm imagining that you can use Javascript, but I can't figure it out.
My CGI script can accept three options (add, view, reset). So it you
call it like so [myscript.cgi?action=add], it increments the counter by one.
So, in a nutshell, this is what I want:
1) the web page to display the # of calls upon load.
2) When a user presses the "Add" link, it invokes the CGI script to
handle the accounting stuff, then refresh the page with the new number
of calls.
3) When a user presses the "Reset" link, it resets the counter to 0.
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Jan 18, 2007
I was handed a project that, when launched, had some ajax problems--specifically, "Error: uncaught exception: Permission denied to call method XMLHttpRequest.open." That's easy enough to fix--found the call in the .js file that was referencing the development server instead of the live server, and I am aware of Javascript's same-origin policy, which makes good clean sense. Change that call, problem solved.
Unfortunately, it's not solved. I can change the reference from
var url='http://www.devserver.com/function.php?id='+id;
to
var url='http://www.liveserver.org/function.php?id='+id;
but that doesn't solve the issue of if someone comes to the page without the 'www' or to the other domain, whose TLD is a .com instead of .org.
In PHP, I'd simply write the function to dynamically generate the url string, using $_SERVER variables rather than hardcoding the url. But I'm no javascript guy. Any help would be appreciated.
I'd rather not have to put a php redirect in every page to make sure the url is what I want it to be. I'd much rather learn something new about Javascript.
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Jul 16, 2006
A while back I was working on learning C++. However after finding out that making API's was too difficult I switched over to HTML and Javascript for a while to get it to do what I want without having to fry my brain on weird code statements.
Well now I've reached the barrier of being able to save data. For a while I've just had it to the point where the code I need is saved in a textarea and I copy and paste it in notepad. Then upon reentering I pull it out of Notepad and paste into the testarea.
Well enough with the bla bla bla. Is there a way I can use the <form method="post"> stuff to pass a variable to a C++ compiled program?
All I need to know is: 1) can I use <form method="post" action="SomeProg.exe"> and 2) what would the name of the posted variable be to use in my C++ code? As you can tell I running client-side so PHP and other server-side languages that WinXP don't support without special installation wont work.
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Jul 25, 2001
I am pretty new to Javascript and have only created a few pretty basic scripts, mainly dealing with site navigation and mouseovers. I would like now to redo my private home page using a rather complex configuration of frames. It is my intention to use JavaScript (variables) to control the rather intricate page navigation.
My question is this. I know how to define a variable, increment or otherwise alter it's value and how to change a process path based on the value of a variable. I have done all of this within the SAME page. What I would like to know more about is the referencing and modification of variables in "pages" in other windows within a frameset.
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Jan 29, 2007
I have something that runs on a server with no PHP or any of those widgets.
A user submits a form with 6 fields. Clicks "Go". A page appears that displays what he just entered, with a form of his data in hidden fields, and a link with document.form.submit() that takes you to a CGI program. It must be 2 different page loads.
Is displaying what he entered in the form in the next page possible with JavaScript? If so, what are the JS variables that would let me access that data?
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Jul 23, 2005
I'm having a problem passing a variable through a URL because the
variable is supposed to hold a URL that has a variable of its own.
Here is an idea of what I'm trying to do:
href="javascript:
newWin('/vcrc/exitvcrc.jhtml&newURL=http://www.something.net/default.asp?sponID=ETC','NowLeaving',駼',
餠', 'no', 'auto','no');"
So, pretty much, the page I'm sending the variable to think there's two
variables (newURL and sponID), but sponID is part of the URL.
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Mar 20, 2007
i have the following snippet of javascript:
liChilds[x].onclick = function(){
toggleSubMenu(sub_menu_id, false);
return false;
}
That code happens within a loop, and sub_menu_id has a different value through each iteration of the loop. For example, if it loops 4 times, then there will be 4 onclick functions and sub_menu_id would change for each one. This should happen in theory, but instead, whichever item you click on, sub_menu_id takes the value of its last value in the loop. (4 in this example)
My question is, how do I make the function toggleSubMenu take the value of sub_menu_id at the time the on click function is created (i.e while looping) rather than taking the value of sub_menu_id when it is actually clicked.
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Feb 4, 2005
I'm having a problem getting javascript and vbscript to place nicely together. Here is what I want to do:
I'm getting values from my database for different exam types. Here are some sample values:
Exam Type1
Exam Type2
Exam Type3
Here is how I get the values in vbscript: Code:
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Aug 10, 2006
Is there any simple way of passing HTML variables from one HTML page to another HTML page without using PHP or messy URL extensions?
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Jul 20, 2005
There will be a number of list boxes and other controls, with pop-up windows
to edit certain properties. It's the kind of thing I would normally have
done in VB but I want it to be browser-based. I've only used javascript for
trivial things before so this would be my first serious javascript
development. I would like it to run on all reasonably recent browsers.
The form starts with all the initial values being received from the server
(presumably just by pre-initialised data structures). The user tinkers with
it and when he is happy he presses 'submit' and the whole lot is submitted
to the server (presumably as a form post). This would be a few kb of data,
possibly 100 individual values but obviously in various data structures. I
guess there would be a few hundred lines of javascript code to manipulate
it.
My question is, is there likely to be a problem with manipulating and
sending this amount of data in Javascript. Sorry if this is a dumb question,
but like I said, I only used javascript for tiny programs before, so I'm a
bit unsure about its capabilities.
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Sep 4, 2006
The URL is similar to:
https://url.com/form.htm?string=p,val1*l,val2*m,val3*t,val4*d,val5
Within the form, I have the following statement:
<input type="hidden" name="string">With this statement, string should take the value "p,val1*l,val2*m,val3*t,val4*d,val5"
I'm having a problem with the following script:
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Feb 14, 2005
i'm trying to create some javascript string variables using php. i'm running into a problem because some of the variables span multiple lines and this is causing a problem. here is a sample of what i'm trying to do:
var thetext1=new Array()
thetext1[0]="info for #1 goes here"
thetext1[1]="info for #2 goes here"
thetext1[2]="info for #3 goes here"
etc.... the array values are output from a mysql db using php and used for a script i have on my page.
the problem is some of my strings span multiple lines and end up making it look like:
thetext1[36]= "this is an example
of how some stuff spans
multiple lines"
Using the javascript console in firefox i see the problem is: "Error: unterminated string literal." I believe it is because the string I am trying to input is spanning multiple lines. any idea on how to fix this?
i'm using php/mysql to create these javascript variables so i have access to their functions. i tried doing this:
str_replace( "
", '', $row['text']);
to replace the newlines with nothing but they're still there.
any ideas on how to get around this?
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Apr 2, 2009
Anyone know how to get Javascript variables into PHP variables or a MySQL database? Full question in the PHP section.
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Feb 3, 2011
I have some JavaScript which is splitting out the different variable elements from the URL.Now, how do I set the internal variables?Then I want to set the variable ScriptHeading to be Change and the variable ScriptType to be NewThread.I keep finding all sorts of lovely code showing how to split out the various sections in many different ways, but I can't find anything on how to actually set these variables.
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Apr 4, 2006
I thought it was possible to send two variables in an URL like this:
print" <script type='text/javascript'>
document.location.replace('http://127.0.0.1/add_task.php?tk_request_name={$req_name}?tk_req_id ={$maxValue}');
</script>";
but I can't get them separately in add_task.php
is there something wrong with script?
I use this code in some other PHP code.
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Apr 9, 2007
Lets say I have a variable declared as such:
var newVariable="opener";
How can I then use this variable to access the opener of 'window' ?
Meaning, I dont want to access it as such:
window.opener
but as: window.+newVariable
So it uses the contents of newVariable to access the opener.
I need this because I have a couple of variables which I need to concat to eachother as a string,
and this string in turn is the variable I need to access from window.opener.varSomething
where varSomething is the variable that stores the variable I need to access.
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Jul 20, 2005
I use ASP to obtain data from a database and I have a piece of javascript
code I use on my website. I want to use the database variables in my
javascript. I'm not very familiar with javascript, but here is some info
similar to what I'm trying to do.
<%
strFirstName=session("FirstName")
strLastName=session("LastName")
%>
The javascript code I want to use the variables in.
Items[1]=["First Name", strFirstName,""]
Items[2]=["Last Name", strLastName,""]
Please help or point me to a website with this solution. Thanks much for
your help.
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Jul 20, 2005
if the url was thispage.htm?day=4
how does one grab the day value?
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Feb 22, 2011
Not sure if php is the best solution or maybe javascript. ( or both.)
I am writing a litle script that will go to my mysql table and take out 20 rows ( from about 10,000 rows ) based on the WHERE statement.
Then I want to step through these 20 rows displaying just two filds in this fashion:
First, I want to display one field in a "box" ( using divs and css ) then wait for a form input. Then while keeping the first displayed box and field display the second field in a similar box a fee lines below. Wait for a form input update some data.
Then onto the next row.
If I use javascript then I could keep all the processing on one page and not have
to have server refreshes.
But how do I get these those array elements from $row['field1'] and $row['field2'] into javascript vars ?
Is this the best way to do this ?
Or would php and having a couple of extra trips to the server for form processing be better ?
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