JQuery :: Lambda Functions - Edit And Reuse The Function Easily
Apr 10, 2011
Seeing the examples I have noted that you always use lambda functions. Is there any reason for that? why you don't make something like this:
I think is more clear than:
And we can edit and reuse the function easily, also if you are using an editor like Netbeans you can see all your functions in a list.
Even more, I think in some situations is faster a closure because we are not creating a new object every time we pass the function:
Is there any reason for chosing lambda functions?
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Jul 30, 2009
I would like to be able to generate a table from which I can easily edit the contents of a mySQL database (similar to phpMyAdmin.) In that table I would like to have a button that will open a pop-up, allowing me to edit - and maintain formatting such as apostrophes and line breaks - a long description field. That popup will then populate a hidden input field on its parent with the modified description.
I've got the pop-up opening and its fields are populated using php's GET function (see line 11). The special characters, particularly carriage returns, are messing me up; I can remove them using php's str_replace, but I want to retain them for formatting.
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Jun 15, 2010
I've got the following source code: function MyMenu()
[Code]...
I wish to execute the lambda function given at menuEntries[i].action. The list is build, but at a click i've got the error that menuEntries[i] is not defined. What should I do? I think
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Aug 17, 2010
In one of my functions I got the following lambda function. It works as intended, but I got a tiny problem. I'm trying to access the function-scooped variable "matched" and set it's value to "true". The problem is that it seems like the variable is existing as a local variable inside the lambda function, even if it's not declared inside the lambda function itself. So, the change "matched = true;" does not effect the variable that I declared.
Code:
//... code
var matched = new Boolean(false);
xmlhttp.onreadystatechange=function() {
if(xmlhttp.readyState == 4 && xmlhttp.status == 200) {
[Code].....
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Jul 31, 2010
to add minuts and seconds so can change the background ex. 07:45:00 instead of just hours only.
/* This script and many more are available free online at
The JavaScript Source!! http://javascript.internet.com
Created by: Anonymous | http://musikimiz.googlepages.comLicensed under: Creative Commons
[code].....
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Jun 20, 2011
I need some way to use ajax to upload a file mainly a image and a video to my website.
I googled around and found many people saying it's impossible to do it with ajax.. but there are jquery work around plugins where it uses an hidden ifframe to submit your files.
what is the best and simple way to do this task?
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Apr 9, 2010
I want to use the datepicker for multiple fields in a form however I don't know how to have it re-use the settings for multiple fields. For example, I have a form with 4 different fields for dates. I want to use the same datepicker formatting for each field. So instead of having to do something like this
[Code]..
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Oct 27, 2009
Can you show me an example of javascript LAMBDA codes.
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Sep 18, 2010
I have some carousel code that I include on a page that has one carousel. Well, now we need to have two carousels with different content. So, instead of me having to recreate dbl data, I am curious how I can retrofit my current code to that I can objectify it for reusability.
[code].....
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Jan 1, 2003
Just a quick 10-minute thing I whipped up out of boredom:
In Mozilla, every textarea now has:
surroundSelection(leftstr, rightstr)
and insertAtSelection(str)
methods.
In IE, you need to explicitly give textareas those methods by:
ExtendTextArea(refToTextArea)
And now that textarea has those same methods.
I see this question asked enough that I thought it might be useful enough to post this.
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Jul 23, 2005
I am trying to reuse a popup in my application. The reused popup also
opens another popup. From this final popup I then try and reference a
function located in the window that origionally opened the reused
popup. This works fine in IE but doesn't in FireFox. Looking at the
code through the Javascript debugger in FireFox it tells me that the
reused popup's opener is closed even though it is still open. Is this
a bug with FireFox or just bad practice?
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May 14, 2009
I have the following html code, that is an input Button and onclick runs the javascript function EnquiriesReport().
<input type="Button" name="Enquiries" value=".Enquiries" onClick="EnquiriesReport()" class="formsubmitTwo">
Here is the javascript code for the EnquiriesReport() function:
function EnquiriesReport()
{
if( ValidateData()) {
form1.action="EnquiriesReport.asp?"
form1.submit();
}
}
My question is how can I run the EnquiriesReport() function so that the "EnquiriesReport.asp?" opens in a new window?
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Apr 29, 2011
I'm trying to reuse some code in a different context to do a different job.The code to be reused contains hundreds of lines similar to a = new b.c.d(e,f) with different value for e and f.I need to create a new user defined object with the structure b.c.d. I've made numerous attempts along the lines of:
function d (e, f) {
this.e = e;
this.f = f;
}
[code]....
with various permuations of functional declarations.However I get error message "Object expected" or "b.c.d is null or not an object" at the final line of the example.It works with the test line var a = new d("test", "message") but not when I start to build up the expression.How should I define of b.c.d?
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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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Jan 21, 2010
I have a nproblem with running commands from a loaded page;[code]Now i want to execute the alert() on page BB.html when doing the load on page AA.html.
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Aug 25, 2011
but i have these basic functions to show a div and all i would like to do after these run is to actually make the screen scroll to the bottom here is my code i know is wrong can you please point me in the right direction.
<script>
$(document).ready(function(){
// $("#go2").click(function(){
[code]....
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Oct 3, 2011
I can't seem to get the syntax correct to get this to work. I'm sure it is something simple.I want to call multiple functions inside my document.ready function.The first function gets called but not the second.
$(document).ready(
function GetSuspectCollection() {
$.ajax({[code].....
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Oct 26, 2010
When thebody section below iscommented out, I get hello, and when it isn't, I don't !
$("body"
).click(function
(e){
return
[Code]....
Is this a bug, is it an unavoidable aspect of the "live" architecture
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Aug 18, 2006
I was trying to understand this type of functions and how do they work, but can't find a good tutorial or page that refers to functions like this:
someName = function () {
....
....
}
Does anybody knows a good resource that explains it? I was also wondering how to call a function that is set like this.
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Oct 27, 2011
i thought about following code snippet:
Code:
var newfunc = function() {
//...
}
[Code].....
Has anyone an idea, if my thoughts on that are correct oder if this behaviour could be a problem? And is there probably a better way to combine functions, so that all functions would be in one column?
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Feb 12, 2010
Is it possible to make a variable available to other functions outside a function So to make it global from within a function without using a callback
function() {
var something = 'hello';
}
function(something) {
document.write(something);
}
something like that possible??
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Apr 1, 2011
How do I make these three functions into one script?
<script type="text/javascript">
setTimeout('yourFunction();', 2500);
function yourFunction(){
document.getElementById('hide').style.display='block';
}
</script>
<script type="text/javascript">
[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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Jan 8, 2007
I want to learn more about creating functions for element events
without having to put onclick event in every tag. For example:
<script>
document.getElementsByTagName('input').onclick = function () {
alert('hello');
}
</script>
Now, I know the above does not work as I have tried it but hopefully
the idea of what I am trying to achieve here. Basically for every input
tag, when the user triggers the event (click) it will do the same
function.
Anyway, I would more so like to learn about this type of scripting
where you assign functions to events. However, I dont know what to
search for in google and the like. Where could I learn more about this?
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Jul 27, 2011
I totally understand that in order to learn javascript I need to know how functions work, I understand the basics of passing in parameters and then calling the function with the values to maybe add something together etc I ve read countless articles about functions as well as books etc but I just dont get how they are used and when they should be used etc, the more advanced functions that have maybe 4 parameters and are doing different calculations and returning various values that get fired back into the script just totally confuses me.
What I would like to know is first of all how can I overcome this confusion and also any words of wisdom you may have. I will also add that I have no prior programming experience and have spent the last 2 months frequently hitting my head off a brick wall as I just cant understand javascript.
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Oct 16, 2010
I am confused about the true difference between the two below examples.
first example:
// Demonstrating a problem with closures and loops
var myArray = [“Apple”, “Car”, “Tree”, “Castle”];
var closureArray = new Array();
[code]....
Here we iterate through the length of myArray, assigning the current index of myArray to theItem variable. We declare closureArray 4 times as an anonymous function. The anonymous function in turn declares the predefined write() function, which is passed parameters. Since write() is in closureArray() a closure is created??? During each iteration, theItem is reassigned its value. The four closures reference this value. Since they reference this same value and since this value is reassigned ultimately to the value of the fourth index position, tHe time we execute closureArray later on, all four closures output the same string. This is because all four closures are within the same scope "the same environment" and therefore are referencing the same local variable, which has changed.
I have a couple of problems with this example:
1) I thought a closure is a function that is returned - the inner function is not returned above.
2) theItem is not even a local variable of the parent function (closureArray) - I thought in order for a closure to work, the inner function only accesses the local variables of the outer function, but in this case the local variable is defined OUTSIDE of the parent function.
3) the "the four closures are sharing the same environment." The thing is even in the second example, they are sharing the same environment.
Second example:
// A correct use of closures within loops
var myArray = [“Apple”, “Car”, “Tree”, “Castle”];
var closureArray = new Array();
[code]....
Here we iterate over the length of myArray (4 times), assigning the index of myArray to theItem variable. We also return a function reference to the closureArray during each iteration (closureArray[i]), where i is index number so we assign 4 functon references. So when we iterate through myArray, we immediatelly call the writeItem() fucntion passing an argument of theItem at its current value. This returns a child anonymous function and when that child function is called, it will execute a block that calls the predefined write() method. We assign that returned anonymous function to the variable closureArray. Hence, closureArray holds a reference to that anonymous function. So closureArray during each iteration holds a reference to the anonymous function and we later call closureArray, which in turn calls the anonymous function, therefore calling the predefined write() function to output the local variable of the parent function. This outputs each distinct index of myArray.
This is because since we created the closure, when we call writeItem, passing theItem argument, since theItem is a local variable of the parent function of the closure, it is never destroyed when we later call closureArray (the reference to the child anonymous function)? Yet weren't we using a closure in the first example as well? So whey wasn't those variables preserved?
I don't think it has anything to do with assigning a returned anonymous function to closureArray. Even though an anonymous function creates a new memory position in the javascript engine, therefore not overwriting the other function references we create during the iteration, it's still referring to a local variable declared outside the reference. So if it's about the closure retaining value of parent's local variable even after exiting the parent function allowing for the current indexes to be preserved, then why did the closure in the first example fail to retain each index?
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