在函数中传递参数

Question

I want to pass string and integer parameters through a javascript function, but the integer passes as string.

The variable attachfile is a string.

var upload_number = 1;

input.setAttribute("onClick", "removeBtn(attachfile+ upload_number)");

Answer 1

you can use jquery to convert that to a number or you can use parseInt(your_variable,10)

10 here is a radix

EDIT

I meant jquery to validate whether its a number

Answer 2

Javascript has a parseInt() function. The parseInt() function parses a string and returns an integer.

The radix parameter is used to specify which numeral system to be used, for example, a radix of 16 (hexadecimal) indicates that the number in the string should be parsed from a hexadecimal number to a decimal number.

If the radix parameter is omitted, JavaScript assumes the following:

• If the string begins with "0x", the radix is 16 (hexadecimal) If the
• string begins with "0", the radix is 8 (octal). This feature is
• deprecated If the string begins with any other value, the radix is 10 (decimal)

Syntax:

parseInt(string, radix)

(stolen from here )

Answer 3

It would help if you showed the declaration for your removeBtn() function, but the problem seems to be that you are not passing two parameters to the function, you are passing one parameter that takes the value of attachfile concatenated with upload_number - and when you concatenate a string with a number the result is a string.

You need to pass the parameters separately, ie, instead of:

removeBtn(attachfile+ upload_number)

Use:

removeBtn(attachfile, upload_number)

Then the declaration of removeBtn() should be:

function removeBtn(theFile, theNumber) { // name the parameters however you like

(By the way, the way you are setting the onclick attribute to a string that contains a function call may also be causing you some problems because (amongst other issues) that function and the parameters would need to be globals. But that's - possibly - outside the scope of this question, at least unless you update it to show more of your code.)