Javascript, increment a counter on button click
17,234
Solution 1
You are doing a Post Increment. Make it pre-increment:
addBtn.on("click", function() {
counter.html(++value);
console.log(value);
return
});
Explanation:
// Increment operators
x = 1;
y = ++x; // x is now 2, y is also 2
y = x++; // x is now 3, y is 2
// Decrement operators
x = 3;
y = x--; // x is now 2, y is 3
y = --x; // x is now 1, y is also 1
Solution 2
do you mean:
addBtn.on("click", function() {
counter.html(++value);
return;
});
Solution 3
Try this:
$(function() {
var //valueCount = $("counter").value(),
counter = $("#counter"),
addBtn = $("#add"),
value = $("#counter").html();
addBtn.on("click", function() {
counter.html(++value);
console.log(value);
return
});
});
Take a look in this link about the operator description of ++ in JavaScript.
Only one line actually changed; however, here is the fiddler link if you want to test it.
Solution 4
use
value = parseInt($("#counter").html());
$(function() {
var //valueCount = $("counter").value(),
counter = $("#counter"),
addBtn = $("#add"),
value = parseInt($("#counter").html());
addBtn.on("click", function() {
counter.html(++value );
console.log(value);
return
});
});
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Author by
TechyDude
Updated on September 16, 2022Comments
-
TechyDude over 1 year
In javascript, I want to make a counter that increases the value when you click a button.
When I click the add button the first time, the number doesn't increase.
But when I print the value to the console, the result increases.
The fiddle: http://jsfiddle.net/techydude/H63As/
$(function() { var //valueCount = $("counter").value(), counter = $("#counter"), addBtn = $("#add"), value = $("#counter").html(); addBtn.on("click", function() { counter.html(value ++); //this value is not incremented. console.log(value); //this value gets incremented. return }); });
How do I make the value show the same for both lines?
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TechyDude over 11 yearsThe '++' has to go in front of the value i guess! Thank you for your help!