How do I add an integer value with javascript (jquery) to a value that's returning a string?
JavascriptJqueryCastingJavascript Problem Overview
I have a simple html block like:
<span id="replies">8</span>
Using jquery I'm trying to add a 1 to the value (8).
var currentValue = $("#replies").text();
var newValue = currentValue + 1;
$("replies").text(newValue);
What's happening is it is appearing like:
81
then
811
not 9, which would be the correct answer. What am I doing wrong?
Javascript Solutions
Solution 1 - Javascript
parseInt() will force it to be type integer, or will be NaN (not a number) if it cannot perform the conversion.
var currentValue = parseInt($("#replies").text(),10);
The second paramter (radix) makes sure it is parsed as a decimal number.
Solution 2 - Javascript
Parse int is the tool you should use here, but like any tool it should be used correctly. When using parseInt you should always use the radix parameter to ensure the correct base is used
var currentValue = parseInt($("#replies").text(),10);
Solution 3 - Javascript
The integer is being converted into a string rather than vice-versa. You want:
var newValue = parseInt(currentValue) + 1
Solution 4 - Javascript
parseInt didn't work for me in IE. So I simply used + on the variable you want as an integer.
var currentValue = $("#replies").text();
var newValue = +currentValue + 1;
$("replies").text(newValue);
Solution 5 - Javascript
In regards to the octal misinterpretation of .js - I just used this...
parseInt(parseFloat(nv))
and after testing with leading zeros, came back everytime with the correct representation.
hope this helps.
Solution 6 - Javascript
to increment by one you can do something like
var newValue = currentValue ++;
Solution 7 - Javascript
Your code should like this:
<span id="replies">8</span>
var currentValue = $("#replies").text();
var newValue = parseInt(parseFloat(currentValue)) + 1;
$("replies").text(newValue);
Solution 8 - Javascript
Simply, add a plus sign before the text value
var newValue = +currentValue + 1;
Solution 9 - Javascript
var month = new Date().getMonth();
var newmon = month + 1;
$('#month').html((newmon < 10 ? '0' : '') + newmon );
I simply fixed your month issue, getMonth array start from 0 to 11.
Solution 10 - Javascript
You can multiply the variable by 1 to force JavaScript to convert the variable to a number for you and then add it to your other value. This works because multiplication isn't overloaded as addition is. Some may say that this is less clear than parseInt, but it is a way to do it and it hasn't been mentioned yet.
Solution 11 - Javascript
You can use parseInt() method to convert string to integer in javascript
You just change the code like this
$("replies").text(parseInt($("replies").text(),10) + 1);