Why Return False Stop Event Handlers To Run On Nested Elements
Oct 23, 2009
I have nested markup like this
Code HTML4Strict:
<li><span></span></li>
I have different click functions, one attached to the li and the other to the span.
When I click on the span they both run. Ending the span's event handler with return false; prevented that from happening, which is what I want. But I'm not sure I understand why it worked.. I know, for example, if I was clicking on an anchor, return false would stop the browsers default action of following the href value. Same for submitting a form, return false will stop this. I don't think I understand why this would stop a completely different function from being triggered..
How do I return false (or true) from within a nested control structure.For example, I'm using jquery and I would like to do some basic validation:I want to pass to a custom function named checkDefault every element with the class required.
function checkDefault(elem) { elem.each(function(){ if(elem.val() == elem.attr('title')) return false;
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)?
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?
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?
I am making a system whereby if an element has a class "editable", you can click it and a popup box appears with some options about that particular element. Fairly straightforward, I'm using [code]...
This works fine but I need to be able to have lots of different divs, all with class "editable", some of which are inside others with class "editable". Like this [code]...
However, clicking on the 'somethingelse' div, triggers the click correctly but also triggers it for the parent 'something' div, so I end up with the popup box appearing twice.
Does anyone know how to just catch a click event on the exact div (without using ids) without triggering the parent?
Do you have to use the onClick attrib to have return false work?
i.e. is it possible to do <a href="javascript:somefunct();return false;"> and have the page not reload with 'false' or the browser not complain about illegal use?
I have a page built with asp.net that includes some "imagebutton"s within a form. These render as input tags with the type set to image. I ahve the onclick attribute set to run a custom javascript function and return false.This has worked fine for the few months the code has been in place and then just recently (within the last few days) it has stopped working for a single network user. They click on the link and instead of the function executing (and the AJAX loading details into the page) the form submits. This makes me think that the "return false" simply isn't executing. The user says that they haven't changed any settings or anything that may cause this issue...
The browser being used throughout the company is IE8 under Windows XP. I have checked the version being used on their comptuer and it is 8.0.6001.18702, which is the same version as the one installed on my local machine which is working fine. Another user has logged into the computer being used by the user with the issues and it works fine for the second user.
i am learning JS at school and it is going pretty well. One concept I seem to be having trouble with is Return False; I understand that it is used when working with boolean types, but I seem to see it in other places as well, apparently to stop a function from doing something. I was wondering if someone had a good reference that explains the difference uses of return false.
I have look through the forum and couldn't find the answer I was looking for, I am working my way through the simply javascript book and wanted to validate a form, if the form doesn't validate then keep the user on the same page and guide it with info, if it is OK then allow it to go onto another page, the javascrpt is on an external page and is called correctly, I have removed all the link info just so that it passes the spam filter. The return false does not seem to work, it will give me the alert box and then still move onto the jowebpage.
The "View All Show Times" href should toggle a show/hide div. All of sudden, it's not working IE 6 (FireFox and IE 7 work fine). This never happened until today. Could an altered browser setting have caused this behavior as I didn't change the code? It looks like return false is not firing.
This will work in Firefox, wont in IE8.Although I cannot reproduct it right now, at some point IE was also working if I had a confirm instead of a false... (weird eh?).
As for my "UpdateTable"
Code:
function UpdateTable(myID) { var aa = document.getElementById("displayTable");
[code]....
If I get rid of all the "innerHTML" it works (so I suppose if I create elements and append them it would work, but im hoping for a solution instead of taking that route).
I would like to code a drop down navigation where the top tier of navigation links is NOT clickable, only the child elements. I am wondering how I would go about coding this using Jquery.
This is my first post here, but reading through the others I'm sure someone will be able to help me.I trying to build a client-side validator before running my validation in php. I have a <form onSubmit="function(login name, login password)"> type deal and in my function, I'm returning false if certain criteria aren't met.
the form's action runs it back to the current URL where I have a php validator activated if the post data is recognized. As of now, both are running, which tells me the form is being submit regardless of that return false.
i need a javascript for my checkbox1st: need to check the checkbox to go to next page or else stay at current page with an alert popout "Please check the checkbox"
This is a simple email form validation, with javascript. I first coded the basic 'have you filled in the field" stuff and that worked great, the error message poped up and the form would not submit until corrected.I then put together a email validation function using reg ex, and things went slightly awry. The reg ex works, so hat is cool, but after catching an invalid email address, it submits the form anyway.Following the logic, you can see that the form gets validate, then the email address is validated, then the form validation function returns true, which is probably why it is submitting with the bad email address.I never seen an example of this, but can you put a called function into an if statement? So it would go: validate the form, then if the email validation function returns true, go ahead and submit.Anyway, here is the code:
I am attempting to create a stop in the form action if someone leaves the input blank or with the predefined "Search" however, once the alert pops up and a user presses "OK" it still attempt to submit the form.
I'm pretty new to js, but i've searched this issue and it seems simple but it's not making sense. I'm trying to make the link dead I have this within a div of my html
