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?
I thought about following code snippet 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?
Given an expression f = ƈ*x+3' from a user input I would like to do some sort of:
function userFunction(x):
return f(x)
is it possible with Javascript?
I have a page where I dynamically add functions to links. I want the links to pop up with the index values, why does it alway popup with 5? I expect 1,2,3 or 4.
See code below:
<html><body>
<ul>
<li><a id="mylink1" href="select">Link 1</a></li>
<li><a id="mylink2" href="select">Link 2</a></li>
<li><a id="mylink3" href="select">Link 3</a></li>
[Code].....
Might there be a way to add a set of Javascript functions to a display page's existing set of Javascript functions on the fly without reloading the display page, and if so, how?
A couple of approaches I have tried, but without success are:
- A) For an embedded "retriever" IFrame in the display page to retrieve a set of JS functions from the server and then on its "onload" transfer (by innerHTML transference) that set of functions into the parent display page.
- B) Similiar to "A" but to use regular old browser frames - one being the "retriever" and one being the display page.
- C) Using a JS function in the display page to make a http request for a supplementary .js file(s).
Please note: the goal is to retrieve *only* an additional set of Javascript functions from the server, and then add them to an "original" set of functions already loaded into the browser. Meaning, NOT - say - for an IFrame to download from the server *both* the additional set and again the "original" set, which the parent display page could then run directly from the IFrame.
After "A", "B", and "C", I'm at a loss for further ideas.
I have table in Javascript and it has addrow, deleterow, submit, and functions. when i click it automatically adds new row and it has select option to choose some of them for ex. in added two rows one of them is Motherboard Asus and other is Motherboard Gigabyte.
What i want is when i choose motherboard Asus it added news row with select option Motherboard asus and disabled select option and second time when i click add button let it adds rows but among select options let it ejects Motherboard ASUS. and with this way at the last there will be no options to select
Here is my code:
I need to be able to display dynamic HTML inside a DIV (can't tell what the html nodes would be) - i.e needs to be flexible. The HTML that goes inside the DIV would have its own Javascript too. I was able to get this code snippet working on Microsoft IE7+, was wondering why the same won't work on firefox.
HTML Code:
<html>
<head>
<script>
/* the input type = hidden is necessary or the JS won't be accessible */
/* script defer tag is also necessary */
function insertHTMLOnButtonPress() {
var s = "<html><input type='hidden' id='dummyHidden'/><head><script defer='defer'>function dynamicallyInsertedFunction() { alert('Successfully called - dynamicallyInsertedFunction'); } </sc" + "ript></head><body><input type='text' value='Hello World'/><input type='button' onClick='dynamicallyInsertedFunction();' value='Call Dynamically Inserted Method'/></body></html>";
/* Clearing out innerHTML is also required to flush the innerHTML so that repeated attempts - i.e new HTML/JS should work */
document.getElementById('wholeBody').innerHTML = '';
document.getElementById('wholeBody').innerHTML = s;
}
</script>
</head>
<body>
<br/>
<!-- Don't close the div inline, causes some problem and replaces the buttons too -->
<div id="wholeBody"></div>
<br/>
<input type="button" onClick="insertHTMLOnButtonPress();" value="Insert some dynamic html"/>
<input type="button" onClick="dynamicallyInsertedFunction();" value="Call Dynamically Inserted Method"/>
</body>
</html>
I have tried a couple of things likeRemove the script defer tag
- Removing the dummy input element added which is required for Desktop IE
- Removing the empty innerHTML step before replacing it
But none of these appear to work for Mozilla firefox. I am also looking for a similar behavior on Android's default webbrowser (WebView to be more specific) -- Doesn't work there too.
Demonstration code:
The 'array' variable contains strings representing the id's of different elements. If the for loop above were to finish iterating, would all the links in all three elements call the click function (that displays an alert message), or would only the last element ("element3") have the click function? For me, the latter seems to be the case unless if I'm doing something wrong, but I would like clarifications and, if possible, alternative solutions as to how I can achieve the former result.
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.
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??
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]..
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]....
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]...........
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?
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.
View 2 Replies View RelatedI 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.
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]....
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?
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].....
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?
I keep getting the function first as being undefined for some reason I
don't get.
I'm trying to use setTimeout() to pause execution so that an image in
my web page is switched every two seconds for another. Code:
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
writing a function that will dynamically calculate filed values.I have a PHP-generated form which may have a varying number of fields. I need to:
1. calculate the line total for each row -- unitprice * units = linetotal
2. calculate total of all linetotals.
I have named my fields as follows:
unitprice[1], unitprice[2]... , units[1], units[2], ...
I have the following calculate function:
function calculateOld() {
// get both values
unitprice = document.forms["invoice"].unitprice.value;[code].....
This does calculate what I need but only if I have up to two rows. I need to make the function dynamically count how many rows there are, and calculate the linetotal for each row. And here's where my limited JS knowledge brings me to a halt.I have been thinking about what this new and dynamic function should look like, but that's the best I could produce...
function calculate() {
var unitprice[i]= document.forms["invoice"].unitprice[i].value;
var units[i]= document.forms["invoice"].units[i].value;[code]....
how things are done, don't just give me the code.
Does anyone know how to make this work?
var sectionId = 5;
repeat_section_sectionId();
function repeat_section_5(){
alert("firing");
}
The function's name contains the variables value, so how do we make
the engine see that?
I am creating breadcrumbs using XML with the following code:
// <![CDATA[
var root = null;
$(document).ready( function(){
$.get( "/_assets/xml/sitemap.xml",
function( data ) {
root = data;
var pathname = window.location.pathname;
var local_url = "*[url=" + pathname + "]";
var currpage = $(root).find(local_url).attr("name");
var parentEls = $(root).find(local_url).parents();
var mapped = $(parentEls).map(function () {
var element = $(this).attr("name");
var element_url = $(this).attr("url");
var element_wrap = $(this).wrap('<a href="' + element_url + '"/>').attr("name");
return element_wrap;
}).get()
.reverse()
.join(" / ");
$("#breadcrumb").append("<p>" + mapped + " / " + currpage + "</p>");
});});
// ]]>
The breadcrumbs are displaying perfectly, I'm just having a hard time inserting the <a> tag via .wrap() here:
var element_wrap = $(this).wrap('<a href="' + element_url + '"/>').attr("name");
I want to attach a link to each element's URL and return the name of the tag. The <a> tags aren't being applied here, what am I doing wrong?
I have a set or icons that which over time I replace with a different icon and and add a onclick event to them. This is my code
function updateStatusIcons(retText) {
updatingStatuses = true;
var updates = retText.split("|");
for (z=0; z<updates.length; z++) {
[Code]....
Everything works fine except for the onclick event. In the hover message of the icon, the correct project ID is displayed in the message, hoever in the function, the onclick funtion always loads the page with the last set project id. How can I pass the project id into the onclick function and make it stay fixed and not be the value of that it was last set to?