I have created this:
var where = function(){
sym.getSymbol("Man").getPosition()
}
console.log(where);
if (where()<=0){
var playMan = sym.getSymbol("Man").play();
} else {
var playMan = sym.getSymbol("Man").playReverse();
}
This is for Edge Animate hence all the syms. I am trying to access the timeline of symbol Man, then if it is at 0 play it. But it isnt working and the reason, I think, is that I have an incomplete understanding of how a var works. In my mind I am giving the variable 'where' the value of the timeline position of symbol 'Man'. In reality the console is just telling me I have a function there, not the value of the answer. I have run into this before and feel if I can crack it I will be a much better human being.
So if anyone can explain in baby-language what I am misunderstanding I would be grateful.
Thanks
S
var where = function () { ... };
and
function where() { ... }
are essentially synonymous here. So, where is a function. You are calling that function here:
if (where()<=0)
However, the function does not return anything. You need to return the value from it, not just call sym.getSymbol("Man").getPosition() inside it.
That, or don't make it a function:
var where = sym.getSymbol("Man").getPosition();
if (where <= 0) ...
The value will only be checked and assigned once in this case, instead of updated every time you call where().
Try
var where = function()
{
return sym.getSymbol("Man").getPosition();
};
Your code wasn't returning anything.
var where = function() {
return sym.getSymbol("Man").getPosition()
}
console.log(where);
if(where()<=0) {
var playMan = sym.getSymbol("Man").play();
} else {
var playMan = sym.getSymbol("Man").playReverse();
}
Related
Somewhere a constructor is defined like
var Something = function() {
// do stuff
}
If I could insert the line
mydebug.Something = this;
at the beginning, I could store the most recently created instance of Something, which would help me debugging. I can't, but I get passed the Something (the function and its name) and can replace it by something else. I just don't know how to make the "something else" to behave like the original.
function intercept(someConstructor, someName) {
return function <<someName>> () { // 1
var result = <<create a new instance>>; // 2
mydebug[someName] = result;
return result;
}
}
which would get called as
intercept(Something, "Something")
There are at least two problems:
I don't know how to create a function having a name given by a variable.
I don't know how to create the instance.
For 1:
Depending on where you are storing that function you don't have to name it in your intercept implementation.
You can just do return function () { ... or you can do something similar to someObject[someName] = function()... and then return someObject[someName].
For 2:
If I understand correctly you should be able to just do var result = new someConstructor();, but I'm not 100% clear on your goal.
Sorry for yet another question about callbacks. In trying to solve this problem, I've run across about a million of them. However, I'm having trouble wrapping my head around this particular scenario.
I have the code below, which obviously doesn't work as delegates apparently don't return values (I'm learning as I go, here). So, I know I need a callback at this point, but I'm not sure how to change this code to do that. Can anyone help?
function MyFunction() {
var ThisLoggedInUser = checkCurrentUser();
//do some stuff with the current user
}
function checkCurrentUser() {
var context = SP.ClientContext.get_current();
var siteColl = context.get_site();
var web = siteColl.get_rootWeb();
this._currentUser = web.get_currentUser();
context.load(this._currentUser);
context.executeQueryAsync(Function.createDelegate(this, this.CheckUserSucceeded),
Function.createDelegate(this, this.CheckUserfailed));
}
function CheckUserSucceeded() {
var ThisUser = this._currentUser.get_title();
return ThisUser;
}
function CheckUserfailed() {
alert('failed');
}
Based on your comment, you have to rething the way you want your code because you cannot use ThisUser in MyFunction().
For example you could do that:
function CheckUser() { ... }
// then call the function to find the current user
CheckUser();
// then in CheckUserSucceeded you call MyFunction()
function CheckUserSucceeded() {
MyFunction(this._currentUser.getTitle())
}
// and now you can use ThisUser in MyFunction()
function MyFunction(ThisUser) {
// do something with ThisUser
}
Your CheckUserSucceed won't return anything because it's asynchronous....
So you have to do something like that:
var ThisUser;
function CheckUserSucceeded() {
ThisUser = this._currentUser.getTitle()
// here you can call an other action and do something with ThisUser
}
You may also want to check the $SP().whoami() function from http://aymkdn.github.io/SharepointPlus/ and see the documentation.
I am messing with Javascript code that needs to have variable dynamic part.
I am trying to substitute this piece of Javascript code:
var data = document.getElementById('IDofSomeHiddenField').value;
var print = document.getElementById('IDofOutputField');
print.value = data;
with something like:
var encapsulatedData = "var data = document.getElementById('IDofSomeHiddenField').value;";
var encapsulatedPrint = "var print = document.getElementById('IDofOutputField');";
so that when I use somewhere in Javascript code:
encapsulatedData;
encapsulatedPrint;
this will work:
print.value = data;
But it does not work.
Is there a way how to declare:
var encapsulatedData
var encapsulatedPrint
in similar manner like I wrote above, so that:
print.value = data;
works?
Do you mean magically create global variables?
function encapsulatedData() {
window.data = document.getElementById('IDofSomeHiddenField').value;
}
function encapsulatedPrint() {
window.print = document.getElementById('IDofOutputField');
}
encapsulatedData();
encapsulatedPrint();
print.value = data;
This is not very sanitary code, and what you want is probably not what you should be doing. Could you step back and say what your goal is, rather than the means to that goal? I suspect what you really want to be using are closures or returning first-class functions for delayed evaluation.
For example:
function makePrinter(id) {
var outputfield = document.getElementById(id);
return function(value) {
outputfield.value = value;
}
}
function getValue(id) {
return document.getElementById('IDofSomeHiddenField').value;
}
var data = getValue('IDofOutputField');
var print = makePrinter('IDofOutputField');
print(data);
You have a syntax error I think. You're not closing the parentheses on the first and second lines.
var data = document.getElementById('IDofSomeHiddenField').value;
var print = document.getElementById('IDofOutputField');
print.value = data;
It is also bad form to use JS evaluation like you're attempting to do. If anything you really want to create a function for each of the page elements that returns the page element. ECMAScript 5 has properties which I think is sort of what you're looking for with what you're trying to do but that isn't how ECMAScript 3 JS can work.
I am making flash player that suppose to be controlled from outside, from javascript.
I need those methods:
Play/Pause and Volume level
I am stuck with volume level... I tried to add this code:
flashMovie.volume = 10;
Where flashMovie is flash instance... And it's show NO ERROR but it's NOT WORKING
I try to make inner AddCall(); and then when it's called to call() from javascript to return sound level.
AS 3:
function setthisvolume()
{
var vlm = ExternalInterface.call('giveMeVolume()');
this.soundTransform.volume = vlm;
}
ExternalInterface.addCallback("setthisvolume", setthisvolume);
JS:
var soundlevel = 10;
function soundlevelset()
{
var flashMovie=getFlashMovieObject("objswf");
flashMovie.setthisvolume();
}
function giveMeVolume()
{
return parseInt(soundlevel);
}
But I am getting this error:
Error calling method on NPObject!
I even tried with setInterval():
AS 3:
function setthisvolume()
{
var vlm = ExternalInterface.call('giveMeVolume()');
this.soundTransform.volume = vlm;
}
setInterval(setthisvolume, 1000);
JS:
var soundlevel = 10;
function giveMeVolume()
{
return parseInt(soundlevel);
}
And it doesn't show any error, but it doesn't work neither...
Did someone work with stuffs like this?
Can someone help me what I am doing wrong here...
Thank you!
Thank you, #someone!
This second option worked okay!
Here is working code:
AS3:
function setthisvolume(vlm)
{
this.soundTransform = new SoundTransform(vlm);
}
ExternalInterface.addCallback("setthisvolume", setthisvolume);
JS:
function getFlashMovieObject(movieName)
{
if (window.document[movieName])
{
return window.document[movieName];
}
if (navigator.appName.indexOf("Microsoft Internet")==-1)
{
if (document.embeds && document.embeds[movieName])
return document.embeds[movieName];
}
else
{
return document.getElementById(movieName);
}
}
var soundlevel = 0.5; // it's 0-1 volume, not 0-100
function soundlevelset()
{
var flashMovie=getFlashMovieObject("objswf");
flashMovie.setthisvolume(parseFloat(soundlevel));
}
When you are using slider each time slider change you need to change soundlevel variable and call soundlevelset();
Hope I helped next one who is starting with this... :)
Thank you!
Try removing the parentheses when calling giveMeVolume, by changing this:
var vlm = ExternalInterface.call('giveMeVolume()');
to this:
var vlm = ExternalInterface.call('giveMeVolume');
If that doesn't work, try passing the volume directly as an argument/parameter, like this (this is probably a better way to do it):
AS3:
function setthisvolume(vlm)
{
this.soundTransform.volume = vlm;
}
ExternalInterface.addCallback("setthisvolume", setthisvolume);
JS:
var soundlevel = 10;
function soundlevelset()
{
var flashMovie=getFlashMovieObject("objswf");
flashMovie.setthisvolume(soundlevel);
}
Code looks reasonable.
Check if you allow Flash to communicate with script There is property when you create Flash object - AllowsScriptAccess - http://help.adobe.com/en_US/as3/dev/WS5b3ccc516d4fbf351e63e3d118a9b90204-7c9b.html .
Check if Falsh is coming from the same domain as HTML page.
For addCallback check if you are getting correct Flash object by Id (the way to create Flash is different in IE/FF, so you may be getting the wrong one).
Check if you have correct SWF file - browser may cache older version... I.e. add element on the Flash control that simply shows static number and make sure it matches to latest one.
I am new to Javascript. I am trying to understand where "this" is bound to using different examples. I am using console.log to print some values as shown below.
function FuncObject(value) {
this.answer = value;
this.get_answer = function () {
return this.answer;
}
};
var f = new FuncObject(42);
var fanswer = f.get_answer;
console.log(fanswer())
console.log prints "function" instead of "undefined". document.writeln seems to print "undefined" which is the right one because this is bound to the window object which does not have answer. Now printing function confuses me. Now I am wondering what i should be using for logging. I am unable to find an explanation for this.
thanks mohan
Just incase you didn't notice, there's a typo in your posted code of
this.get_answer = funcition ()
With that in mind, I'm not entirely sure of your experience level so let me cover all the bases.
function FuncObject(value) {
this.answer = value;
this.get_answer = function () {
return this.answer;
}
};
var f = new FuncObject(42);
var fanswer = f.get_answer;
console.log(fanswer())
You're setting fanswer = f.get_answer where f.get_answer is a function, so as such it sets fanswer to the function equivalent of this.get_answer.
If you want the return value of f.get_answer you need to call f.get_answer(), which returns 42.
With what you put, console.log(fanswer()) does print undefined as expected.
If you simply do console.log(fanswer) it records it as function, also as expected.
I'm not sure why you would receive function as you stated in your question, because I definitely do not, jsbin.