Passing And Using Variables In Object References
Mar 9, 2003
I am trying to make a function that checks/unchecks a checkbox when a specific <td> is clicked. I need to use this same function for several checkboxes in the page so I want to just pass it the name of the checkbox I want to affect as a variable and use it in the object reference lines. BUT, this doesn't work. I can pass the variable to the function as I've used alert(variable) to test this. But it doesn't work when I put it in a line like this "document.forms[0].variable.checked=true;". Code:
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Feb 6, 2011
I have implemented an Ajax object - a div containing another ASP file which can be updated dynamically. This ASP page has a number of checkboxes. Is it possible to use JS (or any other tool) to check the checkbox status (i.e. like javascript's if (field.checked)
[Code]....
But now the form is in the Ajax object's ASP file, so "document" wouldn't work.
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Dec 17, 2005
I am a bit new to JavaScript objects, I have the following object:
LinkTest=function() {
// init
}
LinkTest.prototype.eventHandler=function(){
// the call below fails, as 'this' refers to the link that
// generated the event, and not the instance of LinkTest object
this.doSomething();
}
LinkTest.prototype.register=function(link){
link.onclick = this.eventHandler;
}
LinkTest.prototype.doSomething=function() {
// do something!
}
So basically when you register a link, the onclick event handler gets a reference to LinkTest's eventHandler function. Now when the user clicks on the link, the 'this' refers to the link... how do I reference the instance of LinkTest object from within the eventHandler function?
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Feb 27, 2007
THE QUESTION: How do I get a reference to my Object when processing an
event handler bound to an html element ?
CONTEXT:
Sorry if it is a bit long.
I am developing a JS calendar tool. One of the requirements is that the
calendar will need to display a varying number of months (1..3)
depending on the calling page. Imagine 1, 2 or 3 calendar pages side by
side as required.
I have built a grid object that will contain one month's dates with the
day names at the top. The calendar object inherits the grid object as an
array of "calendar pages" - one grid per month and the calendar provides
the content for each grid. I will use the grid object for another
completely different object later and so I want to use good OOP
encapsulation. The grid is a table generated on the fly and is "dumb" as
far as what it is used for.
I have attached an onlick event to each cell of the grid. Using OOP
priciples I want the calling program (the calendar object in this case)
to provide a function to handle the click and the grid object will
provide to the calendar the row and column of that cell as well as the
grid number (so the calendar can work out which date was clicked since
it knows what the data means and the grid doesnt). Code:
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Aug 22, 2010
I have some confusion about the scripts below:
1) is getRule a local variable or global variable, as it has no var keyword, yet it is an inner function of Validation? So without var, I think global, but being an inner function, I think local. So I'm not sure which.
2) In this line of code: var rule = $.Validation.getRule(types[type]), getRule returns rules, which is just a local variable in Validation. I always see that you return functions, but how does returning a local variable that's just an object literal and not a function be able to return true or false? Now the value of rules is an object literal, and this object returns true or false. So we are basically allowed to use return keyword with local variables that are object literals and not functions?
3) In this line, is foo(age) being called, or is it just being assigned to bar OR is it being called and THEN assigned to bar: var bar = foo(age);
4) Now for the most confusing: age is obviously an object reference as opposed to a literal in the example. Does that make a difference in regards to closures?
Note that I read a number of books, including JavaScript Programmer Reference and Object Oriented JavaScript and jQuery cookbook, which compare primitives vs reference types and how primitive types store directly in memory whereas reference tpyes reference memory, so if one reference changes, they all change where primitive remains ingrained. But when assigning a function as a reference like this, how does that affect the object "age" when passed into bar?
Code:
(function($) {
/*Validation Singleton*/
var Validation = function() {
var rules = {
email : {
check: function(value) {
if(value)
return testPattern(value,".+@.+..+");
return true;
}, .....
$.Validation = new Validation();
})(jQuery);
Code:
function foo(x) {
var tmp = 3;
return function (y) {
alert(x + y + tmp);
x.memb = x.memb ? x.memb + 1 : 1;
alert(x.memb);
}}
var age = new Number(2);
var bar = foo(age); // bar is now a closure referencing age.
bar(10);
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Sep 20, 2006
I've spent several days trying to work this out. Maybe I'm just
searching for the wrong keywords/phrases.
I have some code that looks like:
[-- snippet starts --]
Console = new Object();
Console.init = function() {
this.STDIN = document.getElementById('console0_stdin');
this.STDOUT = document.getElementById('console0_stdout');
// set styles on the element references, eg:
this.STDIN.style.width = ï`%'
this.STDOUT.style.width = ï`%'
}
Console.focus = function() {
this.STDIN.focus();
}
Console.writeln = function(buffer) {
this.STDOUT.value += "
" + buffer;
}
[-- snippet ends --]
I'm not sure why, but the Console.focus() and Console.writeln() methods
just don't seem to be able to use the DOM references stored in
Console.STDIN and Console.STDOUT. Everything's fine in the
constructor, but other methods can't seem to use them.
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Jan 29, 2009
Is it possible to test whether two objects are equal using the data they contain inside and not comparing their pointers with ==?
Well actually of course there is but...
Is there a way to do it without actually looping through the object, instead maybe something that came with JS? (something like a .equals() method from other programming languages.)
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Mar 21, 2005
For some reason, I am using document.referrer in a PHP script that is called as a JavaScript script. The problem is that I need to pass the value of document.referrer to a PHP variable (in the same file) in order to add it to the database. How can I do that?
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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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Oct 1, 2009
This probably seems pretty trivial to you experts but I just don't know why it doesn't work and would like a nudge in the right direction please.I have a sllide and fade that works great - no problems. I am firing it with a function call from the HTML like so;<a href='#' onClick='sfade('#s1'); return false;>as you see I am passing the div to be faded(and slid) as a variable. Works great. The receiving function is:
var str='';
function sfade(str){
$(str).slideFadeToggle(1000);
[code]....
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Jul 16, 2011
I'm creating dynamic buttons and forms for a website and would like the form hidden when it's corresponding button is clicked. However, when I pass button and form name variables to my JavaScript that hides the form, the variables are not being recognised unless I explicitly set them. (e.g 1 and 2 as seen below).
In a nutshell the onlick event doesn't seem to like PHP variables !
[Code]...
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Jul 8, 2009
Don't know if this should be under JS or PHP... I have 2 different pages. On the first one, a table shows a list of items. Each has a button that when clicked opens another window with specific size attributes, hence the onClick event. The 2 PHP variables are computed and different for each item (each line).
Here is the line:
<input onClick="javascript:window.open('player_buy.php?send_role=<?=$data['ROLE']?>&send_price=<?=$send_price?>', '_blank', 'status=0,toolbar=0,scrollbars=0,location=no,statusbar=0,menubar=0,resizable=0,width=739,height=320, top=0,left=0')" class="button_sale" type="submit" value="> > >" name="submit">
Now of course, on the popup window, the URL will show .../player_buy.php?send_role=XXX&send_price=XXX
But the goal is to avoid that. So my question is: Is there a way to open such a popup window, pass these variables to it but in a way that it would not show in the URL?
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Jul 8, 2009
I have a javascript function that receives the form name, field name and value and I want to be able to spit that data back to the originating form after doing some processing on the data.
The values are making it to the function perfectly, but when I try to return those values to the form, it tells me it's not a function. I know there's some syntax problem, but I'm just not sure where!
function doThis(one,two,three){
var myFormName = one;
var myFormField = two;
var myFormValue = three;
var goHere = myFormName + '.' + myFormField;
[Code]...
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Nov 3, 2010
To formulate the problem simple i have two buttons with the onclick function:
I guess what im asking is how can you set a variable by one onclick function and then use it in any other function?
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Jun 10, 2011
I want to pass 2 variables from a html page and collecting in another html page using javascript. Say I pass xyz and abc to a page 2.html from 1.html without using cookies. In 1.html page i have many links. each link should be able to pass different variable to 2.html. When some one clicks on a link the variables should be passed to 2.html. I want to know how to collect them and use them.
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Apr 4, 2006
I have one page witih PHP where users will be answering a form for file upload. However, I need to give them the option to either upload a file or select one that is already uploaded.
In order for them to select a file that is already uploaded, they will use a pop up window to browse to the file and and select the a file with a radio button or submit button to select the file.
What i need to happen is when they press "select" they window needs to close and that file's url or relative path needs to fill in the "select uploaded file" with the path or url.
I"ll be using PHP in both form and popup for the file, but I cant do that with php without refreshing the page. Can javascript do this and how would I go about this.
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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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Jan 21, 2009
How to pass (well more like bridge) session information to the client side from server side.
Right now, what I'm basically doing is echoing the userID and the username into a method in JavaScript tag at the bottom of every page.
The reason why I am doing this is simply for AJAX-related interactivity.
This is an example of what the code looks like:
Code:
A) It requires JavaScript code to be pasted within the HTML document (its non-external).
B) It requires the code to be echoed in EVERY PAGE.
C) A PHP Script or Class must maintain the responsibility of printing the session values.
D) The variable data cannot be accessed from any imported javascript files prior to where it was printed.
Now, I'm wondering about using Cookies. This would benefit me since I don't have to inject any ugly javascript code into the HTML output. I can also remove the PHP script that echoes the values and the changes will be purely handled in PHP (cookies can be updated!).
The only issue that's stopping me is simply security. Since cookies can be edited very easily on the client side, then the data can be changed. But then again so can the JavaScript (using a tool like Grease Monkey).
Once again, I am aware to never ever to trust the client side data without any validation; therefore using some sort of hash checksum, the cookie data can be compared to its PHP equivalents.
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Aug 11, 2010
I've been workling seperately with PHP/ MySQL and am now trying to get things together with jQuery which I have so far only used with non-dynamic content. Here is the setting I am trying to achieve:
I have one php file that generates two different contents depending on the setting of a status-variable $ncs. If $nsc=0 the main page is loaded, showing an overview of all available news-articles. If $ncs=1 the content of a specific article is shown fully. The jQuery connected to each case differs. So i would like to pass the varible $ncs over to my jQuery script:
Code JavaScript:
I have checked that $ncs is not NULL on the rendered page. However after being passed to the jQuery script the variable is undefined. I have never connected PHP and jQuery so it is probably a general twist in my idea of how it works. I tried passing different variables and all are undefined in jQuery. What do I have to attend to when passing PHP-variables to jQuery?
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Sep 12, 2003
I'm trying to pass multiple variables using a url on a Java function call.
the code I have that passes the 1 variable is:
function HandleChange() {
parent.CustomerIf.document.location.href="CustomerReturn.asp?id=" + varName.options[varName.selectedIndex].text;
}
which passes the chosen data (being loaded from a database) from a drop down box on an onchange event in asp script.
What I want to do is pass multiple variable via the above url script that the next page will get by the request.querystring method.
something like this:
function HandleChange() {
parent.CustomerIf.document.location.href="CustomerReturn.asp?id=" + varName.options[varName.selectedIndex].text + "address=" varAddress.value;
}
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Jan 19, 2004
I am attempting to display info put into an array from an onClick() event in a different page - I have created different functions which populate an array with different info dependant on which link the visitor clicks ie HTML Code:
<a href="nextpage.htm" onClick="functiontopopulatearray()"> SELECT</a>
The function seems to work fine, however when the next page loads and I attempt to access the array elements they are now undefined - both pages are linked to the same JS document.
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May 24, 2004
Basically, I have a window with an empty text field in. When I click on a link, another window appears on top of the first. (A pop up window.)
The popup window also has a text field in it. If I type "Test" in the popup window's text field and click "Submit", is there a way I can send that value to the empty text field in the first window?
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Apr 18, 2005
We have a content management system that requires us to fill in 20 fields for metadata about a page. We store the metadata in a separate database for our records.
I'd like to be able to open a window with the data from our database, click a link, and have it fill in the form in the content management system (hosted by a different organization, so window.opener is out of the equation).
I tried this
<a href="#" onClick="window.open('http://www.google.com', 'Google'); window.Google.f.q.text.value='my name'">Enter my name in Google!</a>
In this example, I'd click a link that would open up Google, then pass the value "my name" to Google's search bar. Unfortunately for me, it didn't work.
Am I asking too much? I'd hate to have to rekey or copy/paste 20 fields worth of metadata each time I create a page.
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Mar 18, 2007
At the moment I have this function, which passes variables to a php file with $_get
function savePath() {
//store title
pathTitle = 'pathTitle=' + document.getElementById("pathTitle").value;
//pathLength = getPathLength();
window.location.href = "save-path2.php?"+pathTitle;
}
but I need to use $_post
function savePath() {
//store title so we can use $_post
pathTitle = 'pathTitle=' + document.getElementById("pathTitle").value;
data = '<form action="save-path2.php" name="formData" method="post">
<input type="hidden" name="pathTitle" value="'+pathTitle+'" />
</form>'
document.formData.submit();
}
How would i automaticly submit the form?
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Aug 21, 2000
I forget how to parse the variables passed on the URL like this:
<A HREF="http://www.mysite.com?bla="blahhh"" TARGET=_blank>http://www.mysite.com?bla="blahhh"</A>
How would I check this for a value and add some code to a page if it is equal to this value?
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Nov 21, 2010
Im simply trying to make a dynamic searchbar so that the results pop up as someone write in the keywords. Problem 1 :When i pass foreign char types through jquery's $.ajax(); such as:
[code]....
they get translated to some weird characters when i try to compare them in the mysql database.javascript side:
Code:
$("#id_study4").keyup(function() {
var keyword = $("input[name=study4]").val();
var school_id = $("select[name=school4]").val();
[code]....
And the second problem is simply when i get he search results, i have the keyword emphasized with bold font weight, and text underline so that people can see. The problem here is that if i search with the keyword bach, then result becomes <b>bach</b>elor with all small letters when it should be <b>Bach<b/>elor. The way i have done this can be seen below:
Code:
str_ireplace($keyword, "<b>".$keyword."</b>", $study['study_name'])
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