Calling Javascript Functions From Applet
Jul 23, 2005
We have an applet that has to support the SUN VMs as well as the MS VM.
The applet receives updates from a server (via tcp or http) and wraps them
up as objects and passes them using the JSObject scripting context to a
javascript function.
This function takes the object and reads the properties and updates a
screen.
All seems simple stuff. The problem is that the MS JVM runs like a rocket,
but the sun vm seems to max out our processor and also takes ages to process
anything.
I have tried logging from the console using debug level 5, and it shows a
lot of back and forth between the applet and the javascript when accessing
methods on the object passed.
Seeing that as a possible problem, I now pass a delimited string to the
front end, and then convert that into an update message purely in javascript
so there is only one hit to the applet per message.
I am still seeing a massive difference between the sun and ms VMs.
Has anyone ever come across this, and is there anything I can do to help
flatten out this performance?
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Oct 6, 2005
I've been invoking a javasript method from an applet using the
netscape.javascript.JSObject class.
All was working fine till I upgraded my JRE from 1.4.0 to 1.5
Now the method JSobject.getWindow(this) is returning an exception:
netscape.javascript.JSException
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Aug 9, 2005
The javascript fails to call an embeded applet's function. In the javascript
console, it shows "Error XXXX is not a function". Following are some parts of my code.
if(parent.document.cpmApplet){
parent.document.getElementById('cpmApplet').refreshCPMApplet();
}
if(parent.BottomIframe.document.resultApplet){
parent.BottomIframe.document.getElementById('resultApplet').refreshTableApplet ();
}
Here parent.document.cpmApplet and parent.BottomIframe.document.resultApplet are valid since I loaded both the applets with the same name using <APPLET> tag for Netscape/Mozilla and OBJECT tag for Windows.
The issue is with Netscape and Mozilla on Unix platforms only. I would appreciate if anyone could help me to solve this.
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Jul 20, 2005
I have on a html page an applet. A javascript function call one function of
this applet. It works with IE but not with Mozilla or Netscape. I obtain
the following error on the java-plugin consol:
sun.plugin.liveconnect.OriginNotAllowedException: Javascript is not form the
same origin as je java code ...
This is my html code:
<script language="Javascript">
<!--
function askServerCmd()
{
return document.AppReaderLink.askServerCmd();
}
//-->
</script>
<applet CODE =" AppReaderLink.class"
codebase="."
ARCHIVE ="appredl.jar"
WIDTH =" 130"
HEIGHT =" 70"
NAME =" AppReaderLink"[color=blue]
>[/color]
</applet>
I tri with jre 1.4.1_05 and jre 1.4.2_02 and I obtain the same thing.
What I have to do?
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Apr 8, 2006
How do I display a message applet is loading when a applet is getting
loaded. Without using Mediatracker.I want the message to be provided as
PARAM NAME.
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Jul 20, 2005
let's me explains my long problem:
I'm doing an intranet with a media part. So im must be able to upload files on
a ftp server AND have a record of informations about this file and meta date in
a MySQL database, shown in a php page.
So the first thing i was doing was:
1/ * A HTML Form, with a <input type="file"> which was uploading the file to
the web server. And then, in the next action-php-page, using ftp functions from
php to upload to the ftp server. But this make upload the file 2 times, which
slow, and the user can't do anythig except waiting in front of a blanck loading
page.
=> no way
(BTW, the site admin refuse that the ftp server and the web server to be the
same computer)
So i tried something else:
2/ * A HTML form, the user enter meta data about the media, click next, and
then, a php page which loads a java applet an pass informations to it (by param
tags).
The applet have a browse button, and a go button, which start the transfert
(JDK 1.4.1) trough the URLConnection. The file is uploaded once, and there is a
progress bar, which is wonderful.
But now, i need the src_file information wich is the java applet. So i have two
options:
A/ I make a post to the webserver from the applet. But i'm using session
identification (needed for tracing users actions) and i'm gonna use SSL in less
than one month, so i think it would be complicated.
B/ I export the information from the java applet to javascript, and then to
HTML hidden field, so that the user can submit the full-hidden-filled form. But
i can't make LiveConnect works.
i'm under Mac OS X 10.2 (jaguar) so i need to make work LiveConnect on both
Safari 1.0 (v85.6), mozilla 1.5, and Mac OS IE (5.2).
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Mar 22, 2005
Does anyone know how you can test if an applet's method exists before you try and call it?
for example, if you don't have a JRE installed on your computer and try and access an applet method it shoots out a javascript error at you. I want to be able to test if the applet is operational basically before I try and use any of its methods.
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May 31, 2005
I call methods in a Java applet with javascript code like this:
document.myApplet.methodName();
This works great when the applet has loaded (the JVM has started and dowloaded all the jars) but it fails if the applet hasn't loaded yet, at which point it gives an error:
Quote:
Error: Object doesn't support this property or method
Is there a way to determine that the applet is loaded or not so that I can use it in an if statement? For instance, like so:
Code:
if (isAppletLoaded()) {
document.myApplet.methodName();
}
I tried
Code:
document.myApplet == null
but that didn't work.
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Jun 24, 2002
I am looking at a client’s site that has a scrolling text bar at the bottom of the page for latest news. I have been asked to recommend whether they keep the scrolling text as a java applet or whether they make it dhtml with Javascript to make it scroll.
To be honest, I’m not sure whether there really is an important difference, in terms of download time, likelihood of working (if client browsers are better enabled for one verses the other), or whether there are any other reasons one should be used over the other.
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Jan 23, 2006
When I click on the "Check All" checkbox, it correctly checks all of the boxes in my form, but I would like each checkbox to also call hideLayer2 function just as what would occur if the user checked the boxes individually. Is there a way to call the hideLayer2 function and pass the correct whichLayer and the_box parameters within the DoToAll function? Maybe there is an easier way?
Code:
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Jul 20, 2005
I need to know how to call a function in a different document. At the
moment I've tried onFocus but I'm kinda in over my depth. Perhaps if I tell
you what I want to do you can give me the process and I'll go figure out the
code?
My site is divided into two frames, top frame for navigation, bottom frame
for displaying content (called "top" and "main" respectively).
"top" contains 6 images within 6 seperate anchors, that I use as buttons to
switch between sections, the sections being displayed in "main". When the
mouse is over an image, it changes because I use "OnMouseOver", similarly
for "OnMouseOut".
Here is where I get stuck. I want a different image to be displayed as the
relevant button in "top" depending on which main section is loaded into
"main".
I was hoping to solve this by using "onLoad=" in each of the main pages for
each section, that will call a function in "top.html" to cycle through the
list of images changing the relevant image depending on the content of
"main".
I can see an inherent problem here, I have to make every page (could be
hundreds! - nightmare) call this function.
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Jun 3, 2010
My client wants to use a video as an intro to his site, but doesn't want to use Flash.
My question is, is it possible to call a JavaScript function from a video file. Or I guess, is there a way to time the page, so that the homepage loads after the video finishes playing?
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May 9, 2010
i cant seem to understand why some functions that i create i have to call them with the () and some without
example:
js:
function popup()
{
alert('hello world');
}
html:
<input type='button' value='click me' onclick='popup()' /> the obove code will work.. but some functions when they are being called with the () at the end do not work.
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Feb 25, 2009
I took a quick trip through the FAQ's and Tutorials and a few Searches, but didn't see anything that looked like what I was looking for. First warning - I am completely new to Javascript and have been trying to teach it to myself over just the last week via Internet Examples, reading forums like this one and a book I bought.
Second - I have no idea if I have done this the easy way (or right way), or done it the hard way - and to be honest, I don't care :D It works and that's good enough for me right now. The goal of my script. Pick a random (non-repeating) number. I have a form that allows the user to select how many digits (from 1 to 5) are to be in the number and second line to select how many numbers to display (from 1 to 5).
So far, it all works great. I get my Number of 1 to 5 non-repeating digits and I can select how many of those numbers are displayed. It only works if I load the page and use the IE Refresh button after making my selections. If I use the Go! button, the page reloads with only a single output number using the default settings of the Form.
[Code]...
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Nov 26, 2010
I have an embarrassingly similar problem to the last time I was here. I have a google map that generates links and checkboxes from an xml file and puts them in a sidebar. The links open infowindows and the checkboxes show or hide lines on the map.
Which all works ok. But (like last time) I have another function that puts arrowheads along those lines to indicate directionality.
The code which turns the lines off and on looks like this:
function togglePoly(poly_num) {
if (document.getElementById('poly'+poly_num)) {
if (document.getElementById('poly'+poly_num).checked) {
gpolys[poly_num].show();
[Code]...
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Mar 25, 2006
I've created a selection box (drop down box) with several options for the user to click. What I want is if the user clicks a certain box, then a specific javascript function will run. BTW, I am using Google Maps API here. Code:
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Mar 2, 2010
In my project I'm using onblur event in four text boxes and using that onblur event i wanna call different javascript functions i.e', like first text box onblur="test()" and in second text box onblur="test1()" etc. But only one onblur onblur is calling the function and other onblurs are not working. So pls tell me how can i put more the one onblur event and javascript functions in a single page.
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Oct 3, 2010
I have a problem calling Javascript functions that were included through PHP. The site is written in PHP. I
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Feb 1, 2011
I have the following pieces of jquery code.
$(function () {
$('select[id$=lstOwnership]').bind("change keyup", function () {
if ($(this).val() == 2) {
[code]....
Based on this logic, I'd like to show/hide the ID tag based on the values of a drop down list and another textbox. They both work fine but the problem I'm having is that each can cancel out the other. For example, if the 'txtPercentOther' textbox value is 3 and the drop down item has a value of 2, the ID tag is shown which is fine. But if I were to change the drop down list value to something else, it'll hide the ID tag, even though the other text box still has a value of 3 which means the ID tag should remain shown. I'm wondering if I maybe need to name my function so I can call the other in each.
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Mar 9, 2009
What i want to do is perform an action (specifically click a button) on a web page by executing a program on my computer. I'm guessing you need to activate the button's click event (or whatever javascript uses) on the web page in your program, but I'm not sure how i would go about doing that. Is there a way of doing this in Java?
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Feb 5, 2010
I'm doing some basic Javascript tutorials on the W3 schools site. Here's my example within the TryIt editor on this page: [URL]
Code:
<html>
<head>
<script type="text/javascript">
[code]....
What is returned in the browser is:
Code:
function myFunction() { return "Hello world!"; }
Why is this? And again, what are the rules for this? When can you get away without the parenthesis, and is it appropriate to use? Is there ever a time when you must not include them? When must you use them?
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Jul 20, 2005
I am trying to call 2 functions from the 1 onMouseOver event on an
anchor tag, but I can't seem to get it to work. the following should
demonstrate
<a onMouseOver="ShowMenu('Menu3');AddMenuToHoldArray('Menu3')">Menu
3</a>
I have tried a number of variations, like adding "javascript:" in
front of the first call, and returning True of False from the first
function, but Icant get the second function to fire after the first
one has.
by using alerts, and wathcing what IS occuring, I know that the first
is being called, but the second isn't.
I did this once some years back, but I can't seem to rember how I did,
it, and none of the example that I have located have helped, so can
anyone point me in the right direction?
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Jul 21, 2009
This is probably more of a basic javascript question than a specificjquery function.I have this jQuery function named validateSubmit()which calls two other regular javascript functions. When using IE,both createCharts() and getDirectorIDs get called but when usingFireFox, only createCharts() gets called and never makes it togetDirectorIDs() and I'm not sure why this occurs.
<script type="text/javascript">
// make sure at least one checkbox is checked
function validateSubmit() {
[code]....
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Jul 20, 2010
I'm trying to build a t-shirt creator application w/ php and ajax.You can see where I'm at here.Thus far, I've successfully passed the first parameter from the form via a function called from an onchange event, which uses a php script to pass simple text (for the time being, 'til i get this figured out), which you can see working on the page.trying to update the output w/ each change they make via the form. For every step, the output on the right needs to update.Should I be calling the same function for each onchange, or different functions? Here's what I'm using as far as AJAX/form goes:
Code:
function showShirt(s) {
// CHECKS IF THE STRING IS EMPTY
if (s=="") {[code]...........
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Sep 5, 2011
so, I can pass a value from a select list to another function which then decides which function to call, but I want to cut out the middleman, and make the values the function calls, and call them directly on the onchange... I imagine something like this:
<select id="select" onchange="this.value">
<option selected value="function1()">Funtion 1</option>
<option value="function2()">Function 2</option>
<option value="function3()">Function 3</option>
</select>
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Mar 4, 2009
I used a menu making program to create a cool new menu for my website, but I can't get it to work properly.The menu code uses this argument: "java script:[code]in my above code there isn't really a space between 'java' and 'script'.
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