Returning Reference To Function Definition When Using Self-Invocation?
Mar 26, 2011
I have this code:
HTML Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
[code]....
The practical scenario is I have several functions attached to the jQuery ajaxSucess event. Each function needs to execute once during initial load and after when the JQuery ajaxSuccess event is fired. So I am just looking to see if I can eliminate a a few lines of code and learn something new in the process, that is really all.
I would like to be able to take some action (implemented in a function) when a property is assigned a new value (much a page is re- rendered when, for example, a style is changed). So if I do ...
myObject.myProperty = 5;
I want myObject.myFunction to be called. Is this possible at all?
I have this particular problem with eval() when using Microsoft Internet Explorer, when trying to define an event handler. This is the code:
function BigObject() { this.items = new Array(); this.values = new Array(); this.addItem = function( item ) { this.items[this.items.length] = item; } this.makeHandlers() { var i, length = this.items.length; for ( i = 0; i < length; i++ ) this.items[i].onclick = function() { alert( this.values[i] ); }; }}
However, this last code (makeHandlers() method) doesn't work since the expression "this.values[i]" automatically belongs to this new anonymous function, and therefore isn't valid (since the new anonymous function(s) don't have the "values" attribute. So I tried the following:
and it worked! ... in Firefox only :( Internet explorer returns "undefined" for eval( "function() { /* whatever */ ); } " ), for the same things Firefox perfectly understands, and if I try to make it a handler, an exception is fired in IE. What do I do? Did I come to the right conclusion with IE or am I making a banal mistake? Do I need to find another way of solving this or is there a fix to this solution?
I had a look at sIFR.js code after parsing it and I have a question about function syntax. For example
var f=function(){ // statements here }();
What is the purpose if the second set of parentheses following the closing brace? Is the intention to execute the function immediately after it has been defined?
Most functions in sIFR.js do not have this syntax, but a few do.
I am trying to write a function that is being invoked when some one clicks the submit button on the form.<form name="sectionA" action="optionpage.cfm" onSubmit="return abc()">I have three tables with initials textboxes. I want to check if they are empty and return false(stay on the same page), else go to action page.Here is what I am doing, I Created three functions tableA(), tableB(),tableC() call them from function abc(). These functions tableA(), tableB(), tableC() return false if one of the field is empty and stop furthur processing and remain in the same page. If none(errors), then go the other page.i.e if table B has empty fields, page should stop furthur processing and remain in the same page.Here is how I am doing it Can somebody please point out what I am doing wrong here.Even when there is empty field, the code moves me to the actionPage.
The following code is supposed to return a variable containing text, currently the code posts the data but returns an "undefined" variable. Can someone tell me what's wrong? code...
So for whatever reason the convertToArray function in the following code returns false if the argument is more than 1 character long. If it's 1 character long it just returns the character as an array with only one value.What I'm trying to do is take a string of numbers, plus signs, and minus signs and convert it to an array.
I have a little problem in one of my functions, I would like to pass in a form field name and set the value to something that is passed in. here is my code:
function pickitem(id,type){ opener.document.getElementById("form").type.value = id; window.close() }
so i'm passing in an id and a formfield e.g. txtName The problem is with the type.value - i haven't touched javascript for ages so i'm really rusty!!
I'm attempting to simplify my javascript code when it comes to ajax, but afterwords it only prints 'undefined' to the screen rather than what I want it to print.
I want to be able to put something like this on my main page onclick="document.getElementById('output').innerHTML = print_output();" where print_output() is the ajax function. This way I don't have to use a function to assign values directly to innerHTML and I don't have to muck about with a js file whenever I want to change my page layout.
To do this, I created a recursive function:
function print_output(return_value) {
if a value has been passed to the function, simply return it if(return_value || return_value == 0) { return return_value; }
[Code].....
but like I said, it prints 'undefined' out to the screen. Why isn't this printing the contents that it receives from 'index.php' like it's supposed to?
The code is below but basically I have two global variables, then I have a function and then a function within that, I am simply trying to update these global variables from within the nested function so i can then go on and use them in another function! this sounds like quite a straight forward request to me, but maybe it can not be done? When I do an alert on the variables (after I have apparently updated their values) I get 'undefined'!
Code JavaScript: var resultLatB; var resultLngB; function getLatLngFromTown(town, callbackFunction) { var localSearchB = new GlocalSearch(); localSearchB.setSearchCompleteCallback(null, function() { if (localSearchB.results[0]){ resultLatB = localSearchB.results[0].lat; resultLngB = localSearchB.results[0].lng; pointA = resultLatB; pointB = resultLngB;
Now if I remove the ".getElementsByTagName('a')" it will actually work, but it also includes the <a> tag thats within the <li> tag, which I don't want. document.getElementById('title').innerHTML=pname.innerHTML; </script>
I have just started using the data functions in jQuery for keeping track of a few items on the client. The user can click on links, which call a function that updates the display and stored data value.I am storing data as a set of columns, named c1, c2, c3 etc.
I update the relevant column like this function UpdateCol(column) {
I have several functions with code along the lines of:
var xmlDoc = requestXML("ajax.asp?SP=SelectRelatedTags&tag=" + array[i]);
The requestXML() function includes the code:
var xmlDoc = null; http_request.onreadystatechange = function() { if (http_request.readyState == 4) { if (http_request.status == 200) { xmlDoc = http_request.responseXML; } else { alert('There was a problem with the request.' + http_request.status); }}}; http_request.open('GET', url, true); http_request.send(null); return xmlDoc;
However, the last line (the return) executes before the readyState reaches 4. How do I return the xmlDoc to the functions only once the xmlDoc has been assigned? I tried putting the return statement in a while loop with the condition that the readyState must = 4 - this worked, but makes the browser popup a message saying the script is slowing down the system.
I know this is a simple question with a simple answer, but I can't seem to wrap my brain around it.Sorry for the infantile nature of this post. Anyhow, I am making an AJAX call via JQuery and need the function to return a value from a calling function, like so:
I have a weird bug that's occuring in pretty much all the browsers. If I close the tab, and then hit Ctrl -> Shift -> T to bring it back the width() method returns 0 on an appended image instead of what the image actually is. Hitting refresh on the tab removes this bug and everything works fine. I will also say that trying .css('width') and document.getElementById('divShadowLeft'); Both also return 0 for this bug.
I can't show all the code for security reasons, but I'll just outright ask.. what are the reasons that width() would return 0 on an image? I've checked to make sure that it was visible (both display and visibility properties), and I checked the length of the property to ensure it was there. I just can't figure out why width() is returning 0.
I have a setup where I have a function, calling a function, calling a function. All functions do what they're supposed to do, but they don't return to the first function when all is done, so it doesn't display an alert that it's supposed to.
For those that don't want to look through tons of code and think they might know what I'm doing wrong, here's the "coles notes" version. code...
I am wondering how can I return the variable senttext from the function below?I have declared it and when I alert(senttext) below it appears as I want it but I need to return it and pass it to another function. When I change alert() to return the variable becomes undefined?
var senttext; function getData() { if (window.XMLHttpRequest) {
I have a function where in I call another function that assigns a value to a var. code...
For some reason my code below is returning 'undefined'. But when I place an alert(); before the 'return' it shows the correct value. However when I place an alert(); to show the var that is set to what the function returns it says 'undefined'.
Firebug throws no errors. I am using a little bit of jQuery.
