Possible To Declare A Default Value In A Function?
Jan 28, 2009
How do i declare a default value in a function? I have a simple function
function color_input(id,token){
if (!empty(token)){
document.getElementById(id).style.backgroundColor = '#2A2A2A';
document.getElementById(id).style.color = '#DDC58C';
[Code]....
You will notice that the #2 parameter is missing in the html call. Sometimes i don't have it to send. in PHP i would just set the functions second param like token=''
function color_input(id,token=''){}
How do i set a default param in a JS function?
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Jan 27, 2009
How do i declare a default value in a function? I have a simple function[code]...
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Feb 13, 2009
Take a look at this example:
Code:
function foo(var1, var2=NULL){
if(var2 != NULL){
//do something
}
[Code]....
and in this scenario, var2 would have a NULL value
My question is: Is it possible to declare a null parameter within a function declaration in javascript? (as in the example)
I know this is possible with PHP, but i am having problems with this in Javascript.
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Oct 20, 2010
I have a function which has a nested function in it. I need some variables in the first function to be available in the nested function. How am I supposed to declare a global variable in jquery?
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Jun 5, 2009
I want to declare variable as global to move it from one function to another. How I can do this in jquery?
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Aug 17, 2010
I am trying to declare a variable inside a function and use it later on in my code... but it just already returns white space... i.e. not variable value. I am setting it within this function:
function show_video1(){
document.getElementById('video1').style.display="block";
var video1Name = "Education World News (Part 1)";
document.getElementById('video2').style.display="none";
document.getElementById('video3').style.display="none";
document.getElementById('video4').style.display="none";
[Code]...
and trying to call it later on with this: <script type="text/javascript">document.write(video1Name)</script> It might be worth noting that each one of my 11 videos will hace a different name.
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Mar 1, 2006
When my page loads, I check for the existence of a cookie value through
readCookie(). If there is a value present for the cookie, I would like
that to be the default value in function ordering() and that value to
be the SELECTED value in ddlProfileNames. In other words, if there is
no cookie value, then function ordering will default to
ordering("Div1,Div2,Div3,Div4"). If there is a value, then that should
be used in function ordering and as the default value in
ddlProfileNames. Thanks for any help.
<body onLoad="readCookie('default')">
<FORM name="frmProfileNames">
<SELECT class="smalltext" id="ddlProfileNames"
onChange="ordering(this.options[this.selectedIndex].value);">
<option value="Div1,Div2">1 & 2</option>
<option value="Div3,Div4">3 & 4</option>
<option value="Div1,Div2,Div3,Div4" SELECTED>All Sections</option>
</SELECT>
<a href="#" onclick="setCookie('default', 30);return false">Save as
Default Profile</a>
</FORM>
<SCRIPT>
function ordering(sorder)
{
// code here
}
// start things off:
ordering("Div1,Div2,Div3,Div4");
</SCRIPT>
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Aug 5, 2005
is there a way in javascript to provide default values for function variables.. for instance
In my case the problem is this, i have tables on about 10 pages that all use the same type of table that have checkboxes next to each row, indicating each row could be possibly edited or deleted. Now, i have a function to check/uncheck all by clicking the top box in the column. It works fine, but on one page, i actually have two of these tables. This screws it up though as it will check everything in the first table when i click the select all input box on the second table. I was hoping i could simply change the value for the id of the table and then pass that id instead of passing nothing.
in php it would look like this
function my_function($default_value = "hello") {
in javascript i dont know if this is possible though, it threw errors when i tried syntax similar to that.
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Apr 21, 2007
I've been searching now for quite a while trying to look for a way to give the default value to a function argument if it's not given. For example, in php one would do the follow:
function func_name(foo = 'default') {
...
}
In the above case, if foo isn't supplied while calling for the function, then foo would default to 'default'. I have tried that in javascript, but it doesn't appear to be working, so I am wondering how should I do this in javascript?
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May 21, 2010
Anyway, I am using some code that someone else wrote so I claim no credit here for the code.It works great and I've managed to persuade to work in Wordpress but I have one thing I would like to change.Basically the text I am trying to toggle is "shown" on page load - I would like it to be "hidden" until the user clicks on the link to make it appear.Here's the code:
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/jquery-
[code]....
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Sep 14, 2010
I am looking for a way to put all CSS values on my selected elements back to its default. I was wondering if anyone has maybe done this before and if not has any idea's to get me started.
The idea is that when I use for example:
The elements within .setDefault will return to its default font/color/height/width etc... so basically all posible values.
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Mar 1, 2010
how to handle a callback of an event, before it performs the default href function.
<code>
<a href = '<?php $url ?>' onclick = myFunction(); return true;>Click Here</a>
</code>
I want the onclick event to finish completing and then perform the default href function, which is denoted by the "return true". The javascript "myFunction()" opens a window in a pop-up and it has a submit button in it. I would like to wait till this page loads in the pop-up window and only after the user clicks on the close button, the default href function needs to be carried out. I cannot figure out on how to get the callback from this event.
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Jul 23, 2005
I prefer to keep all my scripts in an external '.js' file. I am currently loading the external '.js' file from the header. Problem is I would like to declare a global variable in the external file, but I keep getting an error about the object does not exist.
Can someone tell me where or how to declare a global variable in an external file that is available after the page is loaded.
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Jul 20, 2005
can anybody put forward a sensible argument javascript's behaviour of
creating a new global variable whenever I assign to a previously undeclared
variable. I can't beleive this is just for the sake of convenience (surely
we learned this much from basic).
here's my proposal: all "global" (document scope) variables must be declared
by 'var' outside a function block.
failing that, does anyone know any patterns or tricks I can use to make sure
I don't create a new global variable when I accidentally misspell a variable
name?
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Jul 20, 2005
If I declared an array or object in a .JS file, should it not be global throughout all the files which reference it?
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Sep 14, 2010
How do i declare an empty array?
I need to iterate through a group of arrays and search for a user-chosen word every time.
The problem is i can't declare how many array elements will be needed, such as: new array = (12), because some words inside my arrays, occur more than others.
So i need to decalare an empty array with x number of possible values.
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Aug 3, 2010
How I can declare 3 decimal number and 2 decimal number in javascript?
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Jan 23, 2010
Subject :I want a variabele to declare from my website
I have made a simple webpage within a webpage
Example :
[URL]
I want to get the Code src="http://www.youtube.com/watch?v=kRopmfinsWk"> as a variabele . How do I manage this
The source code of it is:
<html>
<!-- Generated by AceHTML Freeware http://freeware.acehtml.com -->
<!-- Creation date: 11-11-2009 -->
<head>
<title></title>
[Code]....
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Jul 22, 2009
I have a problem with customer website.My script creates an Auto-Greet that overlays the page, displays in the lower left of the browser and remains visible as the user scrolls the page.
My Mockup the customer home page. This is the desired action.http:[url]....Customer website: (undesired action)http:[url]....The only difference is that my customers does not declare a .dtd document.They have a <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">. On my mock-up, I declare a .dtd document and my script works.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http:[url]...
Question: I'm trying to figure out a way in javacript to dynamically change the <!DOCTYPE, is this possible?
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Mar 25, 2011
How to declare and initialize an array with key/values using JavaScript and then dynamically creating select dropdown and assigning key/values to the options using JavaScript?
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Jul 23, 2005
Well, I've been working with JS for three years and have a great experience here. But! I still have no really acceptable answer to the following
question:
What is the principle difference between declaring methods/properties
in the constructor function body and via prototypes.
Are there any real GURUs? Let's discuss the issue.
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Mar 16, 2011
I find ajax with jquery more confusing than with regular JS, b/c in jQuery you don't declare XMLHttpRequest object.. so how do you do something like:
In example I mention here,[url] namely [url] I don't understand where var 'msg' is declared, I know it comes from the back-end, but HOW is it passed to the front-end? (how do you do this w/o responseText or something similar?)
I'm trying to connect to a send-mail jsp with ajax.. the email is not getting sent.. I want to test if the ajax connection is being made at all.. don't know how do it w/o something like xmlHttp.responseText
This is my jQuery ajax code for connecting to send-email jsp:
var dataToSend = "name=sName&email=sEmail&msg=sMsg;
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Jan 7, 2011
I have been working on a few budget scripts that I can access from the web in using HTML. My problem is that when variable values change I need to change these values in all of the HTML files on the server. I know that there is a way to declare global variables in a single file and use those values in another file but I have not been able to find any information that tells me exactly how to do this. I have tried to put it together on my own using what little informaiton I have been able to find but have not been able to get this to work. Is there a more detailed referance that I can find somewhere or does anyone know what steps I need to take to make this happen?
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Mar 17, 2011
I have many forms on a page. When a user click on a new or upate link, releated forms shows up in a dialog box and i validate it .
What my problem is i after i validate the forms i want them to go to it's own callback. Every callback functions is different according to forms.
How can i set different callbacks to each process.
Code below isn't work exactly. It always alert "test1";
Code JavaScript:
// JavaScript Document
var process = function() {
this.url ="";
[Code].....
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May 14, 2010
I want ask how can i declare global variable in html file , and use it in java script file .
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Sep 17, 2010
I am looking for a push in the right direction for a few problems i am running into; my first problem is I have to create a script element that contains the function amountTotal which should return the sum of all the values in the amount array. There are no parameters for this function, and I have to add the following commands to it.
1. declare a variable named total with an initial value of 0
2. create a for loop thatloops through all of the values in the amount array, at each iteration of the loop, add the current value of the array item to the value of the total variable.
3. and after the for loop is completed, return the value of the total variable.
The amount array has already been created and populated in a list.js file, I had to first create a script element pointing to it.
This is what i had for my link to the list.js file and funtion :
I have my entire code written but i am trying to break it up and fix my problems 1 at a time: when i open the code, it does'nt display correctly ( which is another problem) but I ran the debugger and it says my total is undefined. ( this is in another section of my code), but I guess my function is wrong somewhere.
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