I have written a script that gets trigered by IE's toolbar button. In
this script I would like to asign an event handler to an element of the
document currently open in IE. The way one access the document object
from a toolbar button script is:
var doc = external.menuArguments.document;
Now assuming the document has an element called TextArea1, the logical
thing to do would be:
parentwin.document.all('TextArea1').onkeypress = new
Function('window.alert('asdf');');
Which goes compiles and runs, except the event handler does not get
triggered.
Another trick i tried is as follows:
var s = parentwin.document.createElement('script');
s.text = 'window.alert('asdf')'
s.htmlFor = 'TextArea1'
s.event = 'onclick'
parentwin.document.scripts[0] = s;
What I am coding now is a piece of a much larger project that I am, for the moment, developing on my own. This code, relatively useless on its own, is essentially practice or proof -of-concept. Much of it will probably be used in the larger project. If at times, it seems that I am using a cannon to kill a fly, this is why.
Additionally, I do not claim credit for all the code here. Some of it is copied from other sources. I have studied it, understood it , then modified it appropriately, making it my own.
However, the code is broken. I have tested it on Internet Explorer 9.0.??? and Firefox 4.0.1. It breaks in both browsers. I have previously tested it in Chrome, but not recently. On IE I have used the built in debugger, and I have been using Firebug in Firefox. I have also used the debugger at [URL] quite frequently. JSLINT returns some 'Bad Type' errors regarding 12 lines in the html body, each having the structure: <td><input /></td>. I can find no explanation for the 'Bad Type' errors. Otherwise, according to JSLINT, the code is fine.
The predecessor to this code worked fine. I had been using inline event handlers (onblur and oninput) that called the doMath function when one enters data into the table. The values are then averaged and summed. All this is extremely basic. The problem began when I removed the inline event handlers and began to use window.onload (I believe I am using document.onload now, but the problem has not changed.)
I have adopted Douglas Crockford's 'walkTheDom' recursive function to find all tags with a particular class name. I would like to assign every element in the array returned by this function an event handler.
This is the problem: This script simply cannot find the body node of the DOM ( and, seemingly, none of its child nodes either). Initially I tried 'document.body', which failed. I then began with 'this' (essentially 'document') and tried walking the DOM to get to it ('body') eventually. This, too, failed. I tried array index notation to refer to it(I forget the specific syntax), and most recently, I've given it ('body') an id and referred to it directly using 'document.getElementById()'. These most recent attempts also failed.
After hours of figuratively bashing my head against the wall looking at code and probably even more time doing research online, I am extremely frustrated. As often seems to be the case, my problem is probably simple
I have included most of the code, even though it is a little long. This way you may easily copy the code and reproduce the problem yourself. I do not often post to forums, and, more relevant, I have no idea where the error may be located.
Potential problem areas are in RED.
Code: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head>
This is not the way I want to handle events. I checked MSDN and it seems to indicate that the first way should work. Is there something I can do to get the first way (event handlers?) to work in IE5?
I have a script in which a function launched by a START button continuously calculates and writes a value to a text box. The calculation is done in a for loop. In the loop is a conditional that is a global variable, a boolean. If the boolean is true, break ends the loop (or is supposed to!). A STOP button has an onclick function that sets the global variable to true.
What happens, though, is that the function for the STOP button is not executed until the for loop reaches the maximum value set for i. Anyone know how you can get one button to stop a process started by another?
Is it necessary to return a value from the event handlers? For instance, what does the return value in the following code signify? What will be its impact if it returned otherwise (true)?
<html> <head> <script type="text/javascript"> function BodyClick() { // How to access the event object here? alert(window.event.shiftKey); } function WindowLoad() { document.body.onclick = BodyClick; } window.onload = WindowLoad; </script> </head> <body></body> </html>
It does not work in FireFox. How to make it work?
My only requirement is that I need to assign the BodyClick() handler dynamically in script (not statically in HTML). So I cannot use this solution: <body onclick="BodyClick(event)">
I've been teaching myself javascript and I'm a bit confused about the whole events business. I've been reading the Sitepoint book (among a bunch of others) and when it gets to Ch 4 things get down right confusing. They claim that inline event handlers are "so 1998", something I've heard before and then they proceed to write some pretty complex library files to get around the fact that IE <= 7 doesn't support much of the alternative ways of handling events--a familiar enough story. Anyhow, it seems that many many tutorials all over the internet (and countless pages) resort to inline event handlers as the standard. So, I'm confused. I obviously need to know inline event handlers if I intend to work as a web developer even though it's so 1998. Obviously inline even handlers are not quite on par with inline font attributes and transparent gif files despite the language one often hears. Can someone set me straight, and if possible suggest a brilliant tutorial, book chapter, or website that lays everything crystal clear for me?
I wanted to add a onclick event handler to an image in a loop cos I have a dynamic number of images. The problem is I also need to pass a parameter. This works in Opera 8, but doesn't work in IE:
document.images[i].onclick = "javscript: ShowDesc(" + i + ");";
I've been reading this page on accessing event handlers and avoiding the inline ones. Suppose I want to hover over a link and make it display something else, I thought this is what I would put in the <head>:
<script type="text/javascript"> var x = document.getElementById('question'); x.onmouseover = function() {document.getElementById('answer').style.display='inline'} x.onmouseout = function() {document.getElementById('answer').style.display='none'} </script>
The HTML being:
<a id="question" href="#">Question</a> <span id="answer" style="display:none;">The answer is 42</span>
I've reread the article in the link but to no avail, I don't know what is wrong.
<HTML><SCRIPT LANGUAGE="JScript"> function mouseclick() { alert("I was clicked on " + window.event.srcElement.tagName); } </SCRIPT> <BODY <H1>Welcome!</H1> <P>This is a very <B>short</B> document.
</BODY> </HTML>
The above script works fine in IE But not in Netscape 7.2 :((
I want to build a table that knows where it has been clicked. I found the following solution myself. Are there better ones?
http://www.student.oulu.fi/~pkarjala/question1.html (tested on Mozilla 1.7.8/Linux)
It sets the event handlers for each TD in the build() loop, including a parameter in the function call that is different for each TD.
The whole thing is a simple example with a table with 5 by 5 cells. If you click on a cell it's supposed to change color. Naturally, my question is one more general terms. How to make big tables that associate various event handlers with various cells, and where you will know exactly which element triggered the event? How to make it simple and maintainable?
I am writing a javascript code that parses dom and finds event handlers attached to mouseover events. Then i will replace the existing handler say B() with my own function say A(). When the event happen and control comes to my function A(), after doing required processing i will call B() as shown below
<a href = "abc.com" mouseover = "B();"link </a>
while parsing i will have (trimmed down version)
var oldHandler = node.onmouseover; node.
function A() { / * my code */ oldHandler.call(this); }
This was working fine as long as B() was a global function. I started getting problems when B was a member function. For eg:
function Alerter(text) { this.text=text; var me=this; this.invoke=function () { alert(this.text); } } var sayHi = new Alerter('Hello, world!');
The web developer would have code like <a href = "abc.com" mouseover = "sayHi.invoke()"link </a>
But this time around, my function A() fails since although i have handler to sayHi.invoke(), it has to be executed in correct context. Other wise "this.text" is giving me error because when i say oldHandler.call(this), i am executing the sayHi.invoke() with the html element being passed as this.
I want to create a HTML Table and correspondingly have 2 buttons. One would be add button and other would be remove button. I have few text boxes where I will fill the data and later on clicking Add these text boxes details would be added to the Table. I am using javascript code to handle the event (on click event handler) Similarly I wanted to delete an entry from the table. This is where I am having a problem. The requirement is: In the table if I click on any row I want that row to be highlighted. I can use any color to highlight the row. Then on clicking Remove Button I want to delete that row that is highlighted. I am unable to solve this as I dont know what event handler to use to perform this action and also how to code for this. I am not sure about the events the HTML table can handle and how the selected row can be deleted.
When I register an event handler directly into the HTML tag everything works fine, but I'm trying to register them from the external JS file where the function is, and that doesn't work at all. I've read that this is called the "traditional method" and that it should work.
I've tried it a million different ways, but what I'm putting below AFAIK is correct... but it just doesn't work. I've tried it in Firefox, IE, and Chrome - and used the "Inspect element" feature in Chrome, and am not getting any error messages.
Here is just a simple example of what I'm trying to do - its extremely basic, I know, but I just can't figure out why it won't work.
HTML:
JS:
(Again, it works perfectly when I stick the onclick="message()" event handler directly into the HTML h1 tag, but not when in the external file.)
I am trying to add onclick event handler to many objects but I can't understand why it doesn't work. To assign event handler I use traditional approach as described in [URL]Heres the code (extract.js):
Code JavaScript: //the class function extract(){
[code]....
I know that both select tags don't have options, but I generate them with JS because they hold sequential numbers and this part has no impact on the problem at hand.Both functions help select next or previous index in a given select tag for greater comfort
I'm trying to figure out a way to put this in all js code with the onclick event handlers and the parameters. I have 3 links that switch the style of my page. Right now I have them working with inline event handlers. Here are my code snippets below.
I'm trying to create links that onclick sort a table by title, author, etc. How would I pass an argument to an event handler? Right now, it just executes the sort function. It doesn't wait for me to click the link.
I am new to HTML and I am finding HTML and javascript extremely interesting. I have a problem at hand and I wanted to know how to solve it. I want to create a HTML Table and correspondingly have 2 buttons. One would be add button and other would be remove button. I have few text boxes where I will fill the data and later on clicking Add these text boxes details would be added to the Table. I am using javascript code to handle the event (on click event handler) Similarly I wanted to delete an entry from the table. This is where I am having a problem. The requirement is: In the table if I click on any row I want that row to be highlighted. I can use any color to highlight the row. Then on clicking Remove Button I want to delete that row that is highlighted. I am unable to solve this as I dont know what event handler to use to perform this action and also how to code for this. I am not sure about the events the HTML table can handle and how the selected row can be deleted.
I'm trying to retrieve the "onchange" event handler for a Select that I've retrieved via a call to getElementById() and when I view the element in FireBug there is no value for onchange.
I know the handler is part of the Object because it runs like it is supposed to earlier in my program run, but when I try to retrieve it later through the getElementById(), it's not there.
Do the event handlers get passed with the getElementById() call?
I recently "inherited" a project which involves an applet on a web page, and some Javascript event handling functions. The handler definition looks like this:
where Foo is an applet with parameter FiresScriptEvents set to TRUE. The function Foo_mouseReleased() is a simple javascript function that just alerts a fixed message so I know it's been called.
When I run this applet in a vanilla IE5.5 or IE6, it does exactly what I expect - when the mouse is released, up pops my alert. BUT when I run it on the same browser with Java Plug-In 1.4.2 installed, I don't see it. Is there some compatibility issue with 1.4.x? Can the code be changed relatively simply to work with both VMs, or am I looking at a big rebuild to support browsers both with and without the plug-in?
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:
Trying to add new HTML elements to the document using the jQuery append() function it seems it doesn't add event handlers to the newly created elements.jQuery only seems to add these in Internet Explorer:
I have a piece of javascript which does not work as intended. The code is:
var v = document.getElementById('ReportViewer1'); if (v) { v.ClientController.CustomOnReportLoaded = endPoll; }
The endPoll event handler should be added to the list of event handlers for CustomOnReportLoaded. In the code about, it removes all other event handlers and just adds itself. Looking through JQuery i found:
this will add the new event handler to the collection of event handlers already attached to the click event.how do I select the ClientController through JQuery's selectors?
which is the recommended way to bind event handlers to elements. Preferably without giving each of them an id. As far as I know, the "classic" way (<input onchange="...">) is considered deprecated and evil. So what is the jQuery way of doing this?
