Develop Reference

How to swap two numbers using javascript function with one parameter

My Requirement is
I want to display this output when I gave a(0) the output should come 5 and when I gave a(5) the output should come 0.
a(0) = 5
a(5) = 0
like this
Hint:
Using this function
function A(num){}
like this
Please Help me how to do this I'm new in JS
Please give me different kind of solutions its more useful to my career.

function swap (input) {
if( input == 0)
return 5;
return 0;
}
i think there is no description needed

I think I see what you are getting at.
You want to input one variable into a function, and return another variable that is not defined yet. Then you want to define that variable by inputting it into the same function, and get the first input as the output. And so you should end up with 2 outputs.
Now this is technically impossible, because there are undefined variables at play. However, programming is about imagination and I think I have a solution (it's technically a hack but it will work):
var i = 1;
var output1;
var output2;
function swap(input) {
function func1(input) {
output2 = input;
i++;
}
function func2(input) {
output1 = input;
i = 1;
alert(String(output1) + "\n" + String(output2));
}
if (i === 1) {
func1(input);
}
else if (i === 2) {
func2(input);
}
}
while(true) {
swap(prompt("Enter your first input (this will be your second output):"));
swap(prompt("Enter your second input (this will be your first output):"));
}
The swap function goes back and forth between the values 1 and 2 in the variable i. That is how it keeps track of first or second inputs and their exact opposite outputs. The input, or parameter of the swap function is whatever the user types into the prompt boxes. Feel free to make it user-friendly, this is just the dirty code behind it. The reason they are outputted together is because the second input is undefined, and so the machine cannot guess what you were going to input. So first my little program collects all the data and just reverses the order when it is time to output. But to the user who knows nothing about JavaScript and what is going on underneath the hood, this would work perfectly in my opinion.
This should work for any data types inputted, I tested it myself with objects, strings, numbers, and arrays. Hope this helps!!

Shorter alternative to #mtizziani's answer:
let swap = x => !x * 5 // yes this is all
console.log(swap(0));
console.log(swap(5));
We toggle the input, so x is now 1 or 0
We multiple by 5.
Job done.

Native JS alternative for Java's next() and hasNext() methods

So recently I built a search and replace program with Java, now I am working on translating/rebuilding that program with JavaScript. However, I am having trouble finding JS method alternatives for next() and hasNext(). I am new to JS so I don't know what JS methods would work similarly to the Java methods I am used to.
This is my program, I commented through it to show exactly what I am doing with the previously mentioned methods. Basic set up, 2 text areas, one for the search box (search criteria, box 2), and one for the main document (the field of search, box 1). It basically boils down to a cross-reference. It will highlight all the similarities between the documents.
function search() {
//define an array to store the search criteria.
var array = [];
// define a counter.
var n = 0;
// define a constant for the first box, the search field.
const box1 = document.getElementById("box1");
// define a constant for the second box, the search criteria.
const box2 = document.getElementById("box2");
// loop through the search criteria, storing each word as a seperate element in the array.
// this uses non js terms, this is where I need the help.
while (box2.hasNext()) {
array[n] = box2.next();
n = n + 1;
}
// resets the counter.
n = 0;
// loops through each search item, finding and replacing each item with itself, surrounded by mark tags.
while (n <= array.length) {
box1.replace(array[n], "<mark>" + array[n] + "</mark>");
}
}
</script>
There is bound to be other issues, bugs and syntax, feel free to point them out but lets try and keep the focus on the methodology (i.e. method alternatives for next() and hasNext()).
Thanks.
-EDIT- I'd prefer to use native alternative (no jquery) becuase I know even less about jquery than I do js.

Individual custom start position in Qualtrics through Javascript

I want to use either a slider question or a draggable bar chart in Qualtrics to present to respondents how they answered in former questions. More specifically, I compute a value out of then answers with weighting, and want the slider or bar to be positioned at this value.
Notably, as each respondent has a value (stored in an embedded data field), the position will thereby be individual for each respondent. Piping only works for text fields, as far as I understood the support page.
Based on this question/answer I came to the following code for the bar graph:
Qualtrics.SurveyEngine.addOnload(function()
{
var result = "${q://Field/result}";
var qwidth = $('QID1936~1~track').offsetWidth;
var resrec = ((qwidth*result)/100);
$('QID1936').select('.bar').each(function(name, index) {
name.setStyle({ width: resrec +"px"});
});
});
Basically, I get the result for each respondent out of the embedded data, get the width of the full bar graph, compute the ratio that should be colored based on the result, and update the position of the bar graph (following the mentioned answer).
Funny enough, everything works when done in the console. Also, the embedded data is correctly loaded, qwidth as well.
Two problems arise: it seems resrec could be computed wrongly, as a console.log() spits out 0 instead of the correct value. I assumed this could be somehow as a variable is not recognized as number, but several tries with Number() or 0+var did not change how this works in Qualtrics. In the console, it works just fine.
Also, no update of the bar (or slider with similar code) happens, neither with the correct value nor with the 0 that is produced by Qualtrics.
I search for two things: either a solution to the Javascript problem as described, basically how I can update the bar or slider with embedded data. Or another solution how to directly get embedded data into one of those two question formats as a starting value for each respondent individually.
Thanks for your help or ideas!

Try this:
Qualtrics.SurveyEngine.addOnload(function()
{
var qid = this.questionId;
var result = parseFloat("${e://Field/result}");
var qwidth = $(qid+'~1~track').offsetWidth;
var resrec = ((qwidth*result)/100);
$(qid).select('.bar').each(function(name, index) {
name.style.width = resrec + "px";
});
});
Notes:
It is best not to use a hardcoded QID
In a pipe use e: to refer to an embedded variable. q: is for questions.
Use parseFloat to convert the string to a number
No need to use setStyle if you are only setting one value

One solution proposed by Qualtrics support: when you use bars and/or sliders, piped values are actually possible.
The trick is to have the value of the bar/slider shown (a thing we do not use in the whole survey elsewhere). Then, you can access over the Advanced Question Options > Add Default Choices the blue arrow for piping text behind the value. Through this, the value is individually set to either embedded data or another answer.
Note, however, to tick "Show value" before accessing the default choices, else you will only be able to drag around the bar and set it for all simultaneously.

Here is a solution using the Qualtrics Question API method setChoiceValue that does not require you to compute the ratio and update the length of the bars manually.
Below is an example code for the result of ten respondents saved in embedded data from previous questions.
Qualtrics.SurveyEngine.addOnload(function()
{
var embedded = ["${e://Field/r1}", "${e://Field/r2}",
"${e://Field/r3}", "${e://Field/r4}", "${e://Field/r5}",
"${e://Field/r6}", "${e://Field/r7}", "${e://Field/r8}",
"${e://Field/r9}", "${e://Field/r10}"];
for (var i = 0; i < 11; i++) {
var index = i + 1;
var choiceInput = embedded[i];
this.setChoiceValue(index, choiceInput);
}
});
For one respondent:
Qualtrics.SurveyEngine.addOnload(function()
{
var value = "${e://Field/r1}";
this.setChoiceValue(1, value);
});

Flash/Animate CC Tween Formatted Number

I'm using Animate CC (the erstwhile Flash CC) to do some ads that I'm exporting in HTML5 format (<canvas> and CreateJS stuff). They're working quite nicely overall.
I have a formatted number, in a Static Text box, like so: 5,000,000 and I want to tween it to, say, 20,000, over the course of 30 frames. I want to tween the same text to 5,000 and 1,000,000 and so on throughout the course of my scene.
In my limited Animate CC experience, I've managed to avoid using any Javascript, but I imagine that I will need to now. So, my question: how do I do this?
My thoughts on ways of doing this:
Since I'm using CreateJS, which has the TweenJS library as part of it, maybe I can just use that for tweening? Make little Actions at different points of my timeline? Not sure how all that works, and a lot of the references online are for ActionScript 3 or even AS2. Sample code would be appreciated.
If I do get into Javascript, there's the question of how I would do the number formatting. I could tween the number as 5000000 -> 20000 and on each frame update insert commas, that's one way of doing it. But to make matters more complex, these ads are going to be translated, and different locales come into the mix. So in English you get 5,000,000 and in German would you have 5.000.000, of course.
Since we're talking Javascript in the browser, I'm aware of the method Number.prototype.toLocaleString() which does the following:
The toLocaleString() method returns a string with a language sensitive
representation of this number.
That seems like it would do the trick, but then I have to worry about browser compatibility and what happens if I don't specify a locale. Ideally, since the German ads would only be displayed to people who had a German locale on their browser/OS, I could just call the method without any locale specified, and it would read it off the user's computer. I suppose it's possible to have the scenario where a German person is seeing an English ad, but I'm not that worried about it.
However, on the MDN page for toLocaleString() it has this big warning about earlier versions of FF defaulting to Western Arabic digits, so it makes me doubt the use of the method entirely.
Finally, I have the interesting fact that the translators will almost certainly take 5,000,000 and convert it into 5.000.000 for German. So it may be possible to avoid the use of toLocaleString() since I'll already have localized text. So if it were possible to write a simple Javascript function that could tween arbitrarily formatted numbers, I think that would do the trick. Perhaps:
Take the starting number and rip formatting out of it, save it
Tween the number
On each frame update, inject the formatting back into it
Probably not that hard from a JS perspective, but where I get stumped is how the heck I would do this in Animate/Flash and/or with CreateJS/TweenJS?

As far as tweening a formatted number using TweenJS, you can just tween a non-formatted number, and on "change", create a formatted version to do what you need:
createjs.Tween.get(obj, {loop:true})
.to({val:10000}, 4000)
.to({val:0}, 4000)
.on("change", formatNumber);
function formatNumber(event) {
// Round and format
var formattedNumber = (obj.val|0).toLocaleString();
}
Here is a simple fiddle: http://jsfiddle.net/m3req5g5/

Although Lanny gave some good data, I wanted to lay out exactly what I ended up doing to get this working.
First, you need to get a reference to the object you're going to be tweening in some way. When you make an Action in Flash and write Javascript, this is bound to the Stage, or to the MovieClip or Graphic that you're editing:
http://createjs.com/html5ads/#Scope
You can access objects using their instance names which are defined in Flash on the Properties of the object, once you've placed it on the Stage. Some sources online said that it was based on the symbol name or some such, but I haven't found that to be the case.
// Get a reference to the object you want to tween
var obj = this.anInstanceName;
Note that, if you want to access something that's inside a MovieClip, you will need to give your MovieClip on the stage an instance name, and then go inside the MovieClip and give an instance name to your target object. Then you can just walk down the hierarchy:
// Get a reference to the nested object you want to tween.
var obj = this.movieClipInstanceName.nestedInstanceName;
Now you can tween any numeric property of the object in question. For me, because I wanted to tween the text, I set an additional property on the object and tweened that, then formatted and copied it over into the text property as I went along.
It was useful to be able to specify how many frames the tween lasted, rather than the milliseconds, so I passed the useTicks flag.
obj.counter = 0;
createjs.Tween.get(obj, {useTicks: true})
.to({counter: 100}, 30) // <- 30 frames, this number is ms without useTicks
.on("change", formatNumber);
function formatNumber(event) {
obj.text = obj.counter.toLocaleString();
}
The above is generally applicable. Otherwise, here's the working code that I ended up using. It should be able to be dropped into a Flash Action in an HTML5 Canvas project and just work.
// Figures for tweening
var textStart = "2,000";
var textEnd = "6,000,000";
// Locate our target text box
var target = this.myTextBox; // replace "myTextBox" with your instance name
// Get our formatting data and so on
var data = this.getFormatData(textStart);
// Set up the text box
target.number = data.number;
target.text = textStart;
// Get the raw number we're tweening to
var endNumber = this.getFormatData(textEnd).number;
// Create the tween
createjs.Tween.get(target, {useTicks: true})
.to({number:endNumber}, 30)
.on("change", format);
//Formatting function, gets called repeatedly for each frame
function format(event) {
var rounded = Math.round(target.number);
var formatted = formatNumber(rounded, data.format);
target.text = formatted;
}
// UTILITY FUNCTIONS:
// Takes "###,###,###" or somesuch
// Returns a raw number and a formatting object
function getFormatData(formattedNumber) {
var toString = "" + formattedNumber; // in case it's not a string
var reversed = toString.split('').reverse(); // get a reversed array
// now walk (backwards) through the array and remove formatting
var formatChars = {};
for (var i = reversed.length-1; i >= 0; i--) {
var c = reversed[i];
var isnum = /^\d$/.test(c);
if (!isnum) {
formatChars[i] = c;
reversed.splice(i, 1);
}
}
// get the actual number
var number = parseInt(reversed.reverse().join(''));
// return the data
var result = {number: number, format: formatChars};
return result;
}
// Takes a raw number and a formatting object and produces a formatted number
formatNumber(number, format) {
var toString = '' + number;
var reversed = toString.split('').reverse();
var index = 0;
while (index < reversed.length) {
if (format[index]) {
reversed.splice(index, 0, format[index]);
}
index++;
}
var finished = reversed.reverse().join('');
return finished;
}
This fiddle demos the formatting and has a bit more of an explanation in the comments.
There are other ways of doing this, for sure, such as toLocaleString(), but this fit my exact requirements. Hopefully it'll help someone else.

Changewheel functionality How it works?

First of all I want share my appreciation for the amazing work done with this snippet (it's really really a cool tool).
I am trying to use mobiscroll in an app that I am currently developing. I love how easy is to use and customize the mobiscroll tool.
What I really find just obscure, is how use the functionality changeWheel. I tried many things but never with success.
What I am trying to accomplish is to change the values of the first wheel (change completely and regenerate the first wheel), when in my second wheel I select (actually what I want is an on change event) one of the two parameters present.
I build up a function that create the arrays for the two wheels, and that change array of the first wheel relatively to the index of the second wheel returned. (I can see that the function works, and that it generate the exact values for the wheels).
How then I can implement this with the onchange event on the inst, using the function changewheel???
Is this function changewheel suppose to do what I am looking for?
To be very clear, think as an example:
first wheel weight of a person
second wheel unit of measurement (kg or Lbs)
If I change on the spot Lbs to Kg, I want that the first wheel reflect the changes (updating the values available) - if for example i set the limit weight between 0 and 80kg the correspondent value in lbs need to be between 0 and 177lbs (the whole conversion is handled separately with another customized function, and it works exactly as I want).
I can't figure out how instead implement the changewheel event....an example or some more deep explanation will be really useful.
Thank you so much
Best
Dinuz

here goes a simple explanation, if you want to update the values of a diferent whell you need to pass the instance of the mobiscroll and call the method options
$(function(){
var filtersMetrics = [{}];
var wheelPosMetrics = []
var wheelPosFunc1 = [];
var wheelPosFunc = [];
wheelPosMetrics[0] = "Connection";
wheelPosMetrics[1] = "Shared";
wheelPosMetrics[2] = "Deleted";
filtersMetrics[0]['Metrics']=wheelPosMetrics;
wheelPosFunc1[0] = "Count";
wheelPosFunc[0] = "Count";
wheelPosFunc[1] = "Sum";
wheelPosFunc[2] = "Avg";
filtersMetrics[0]['Func']=wheelPosFunc1;
var metricsScroller = $("#select").mobiscroll().scroller({
theme : 'android',
display : 'inline',
mode: 'scroller',
wheels: filtersMetrics,
rows: 3,
'onChange' : function(v, i , e){
if(v[0]==1){
filtersMetrics[0]['Func']=wheelPosFunc;
metricsScroller.mobiscroll('option', 'wheels', filtersMetrics);
}else{
filtersMetrics[0]['Func']=wheelPosFunc1;
metricsScroller.mobiscroll('option', 'wheels', filtersMetrics);
}
}
});
});
I have used the 2.5 version

I also wasn't able to get changeWheel to work, but I found a workaround (I'm using Mobiscroll v2.15.1).
In the onChange–Handler you can set the default values dynamicaly:
.
.
.
onChange: function (values) {
// here your logic for the current values
if (/*here your condition*/) {
// Example for three wheels:
var curWheel = ["1", "2", "3"];
// set the default values
$(/*your element*/).mobiscroll("setArrayVal", curWheel, true);
}
},
.
.
.