Passing html values into javascript functions

Question

I was making a javascript function in which I need to confirm the input  I wrote the following code but its giving negative value i e   else  part even if i enter a valid value  Can some one please suggest a solution   Html file    lt  DOCTYPE html PUBLIC  -  W3C  DTD XHTML 1 0 Transitional  EN   http   www w3 org TR xhtml1 DTD xhtml1-transitional dtd  gt   lt html xmlns  http   www w3 org 1999 xhtml  gt   lt head gt   lt meta http-equiv  Content-Type  content  text html  charset utf-8    gt   lt title gt Javascript App lt  title gt   lt script type  text javascript  src  app1 js  gt    lt  script gt   lt  head gt   lt body gt  lt h1 id  heading1  style  text-align center  height auto  width auto  font-family  Arial Black   Gadget  sans-serif  gt Determinant of a nxn matrix lt  h1 gt    lt p id  paragraph1  style  font-family  Arial Black   Gadget  sans-serif  gt  This program allows you to compute the determinant of a nxn matrix lt  p gt    lt p gt  Input the order of the matrix  lt br   gt    lt input type  text  maxlength  3  name  value    gt   lt input type  button  value  submit  onclick  verifyorder value     gt   lt  p gt   lt p id  error  gt  lt  p gt   lt p id  detspace  gt  lt  p gt      lt  body gt   lt  html gt    Javascript File   function verifyorder order         if order gt 0           return true            else          alert  Sorry  you need to enter a positive integer value  try again            document getElementById  error   innerHTML  Sorry  you need to enter a positive integer value  try again

User · Answer

Give the textbox an id of  txtValue  and change the input button declaration to the following    lt input type  button  value  submit  onclick  verifyorder document getElementById  txtValue   value     gt

User · Answer

Simply put id attribute in your input text field -    lt input type  text  maxlength  3  name  value  id  value    gt

User · Answer

Here is the JSfiddle Demo  I changed your HTML and give your input textfield an id of value   I removed the passed param for your verifyorder function  and instead grab the content of your textfield by using document getElementById    then i convert the str into value with  order so you can check if it s greater than zero    lt input type  text  maxlength  3  name  value  id  value    gt   lt input type  button  value  submit  onclick  verifyorder      gt   lt  p gt   lt p id  error  gt  lt  p gt   lt p id  detspace  gt  lt  p gt    function verifyorder             var order   document getElementById  value   value          if   order  gt  0                alert  order               return true                    else               alert  Sorry  you need to enter a positive integer value  try again                document getElementById  error   innerHTML    Sorry  you need to enter a positive integer value  try again

User · Answer

Try   if parseInt order  gt 0

[javascript] Passing html values into javascript functions

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