How do I call a function through onChange with parameters

Question

My javascript function sumCol(var mn, var t) is in the with two parameters that are both supposed to be strings.

I call the function from my HTML code. I have a textbox that calls it onchange:

<input type="text" size = 15 id = "Mhour" onchange="sumCol(\''+Mhour+'\', \''+Mtot+'\')">

Mhour and Mtot are the strings that I need passed into the function when I click out of the textbox.

The function works when i don't use parameters and have the string variables set into the code but I need to use the same function in multiple places and these variable change.

Thank you!

Answer 1

if your sumCol function expected two string parameters then simply pass two as like this

onchange="sumCol('Mhour', 'Mtot')

if you want to pass string variable into this then first declare them and then pass them here

   var param1="parameter1";
   var param2="parameter2";

  onchange="sumCol(param1,param2)"

Answer 2

Just noticed you have the following parameters for your sumCol function:

sumCol(var mn, var t) { //... };

should be

sumCol(mn, t) { //... };

The function does't actually take 2 proper variables but instead it takes 2 parameters or arguments, this might explain this better Functions