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How to make multiple prompt boxes and sort their input alphabetically and then show on screen using JavaScript ?
Thanks
Sequentially
if you are talking about the almost obsolete native javascrtipt function prompt() then:
var array=[];questions=['A?','B?','C?'],current=0;
function q(question){
array.push(prompt(question,'write here')+' question number:'+current);
if(current<questions.length){
next()
}else{
array.sort()// needs a proper sort function
alert(array.join("\n"));
};
}
function next(){
q(questions[current++]);
}
next();
Demo
http://jsfiddle.net/c7GnX/
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How to check if a list is not empty?
if (serialNumbersList.Any()) //c# expression equivalent
{
// do stuff
}
In javascript there are no lists but arrays, and you can check their length property
if(serialNumberList.length > 0) {
// Do your stuff
}
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var charArray=[a,b,c]
I want to have a new array as following:
var charArrayNew=[a, ab, abc]
Please suggest how to get the result of charArrayNew in ES6 Javascript.
You could do this:
const charArray=['a','b','c'];
const answer = charArray.map((_,i,ar)=>ar.slice(0,i+1).join(""));
console.log(answer);
// or, alternatively:
fn=(ar,res=[])=>(
ar.reduce((a,c)=>(res.push(a+=c),a),""),res );
console.log(fn(charArray))
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The page just echoes the user input using GET. I have no idea on what concept to apply to detect if the user has alerted something
The easiest approach would probably be to replace the alert method with your own.
const log = [];
alert = function(alert) {
return (value) => {
log.push(value);
alert(value);
};
}(alert);
alert("Hello!");
console.log(log);
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So if i have some codes like this
If(sceneA){document.getElementById("divA").src="A.png";}
If(document.getElementById("divC")=="A.png"){document.getElementById("divB").src="B.png";}//And alot of codes here
How can I use a var to shorten strings like
document.getElementById("divA").src="A.png"
document.getElementById("divB").src="B.png"
so i can use them both inside (IF) and {function}
As they have to repeat quite a few times in the codes.
Thanks alot!
That's exactly what functions are for.
Define a function for repeating blocks of code as follows:
function setSrc(divName, imgName){
document.getElementById("div"+divName).src = imgName+".png";
}
function srcEquals(divName, imgName){
return (document.getElementById("div"+divName).src == imgName+".png");
}
Then you can replace your code with this:
if(sceneA){setSrc("A","A");}
if(srcEquals("C", "A")){setSrc("B","B");}
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I have a function that returns the data from the sql...
I need to create buttons in a div called
divResult
here is my function
function retrieveData(transaction, results) {
for(var i = 0; i < results.rows.length; i++) {
var data = results.rows.item(i)['nome'];
alert(data);
}
}
There is a very good answer on how to create html elements using javascript here: Creating Dynamic button with click event in javascript.
...I would add this as a simple comment but I don't have enough street cred yet.