jQuery检查输入字段的值，并使用1或更大的值

Question

I'm trying to write a very simple jQuery function which includes checking for a value of an input field and if that is greater than 0, setting a variable counter as that value. Otherwise use another value. However, no matter the value of the field, another is always set and I don't understand.

Jquery

  $('.test').click(function(e) {
  var counter = 0; 
  var fieldvalue = $("#fieldID").val();

  if (parseInt(fieldvalue >= 1)) {
    counter = fieldvalue;
  } else {
    counter = 0; // in reality this will be a dynamic value
  }
});

The problem is that counter always returns 0.

Answer 1

you mean fieldvalue in if (parseInt(fieldcounter >= 1) and it has wrong parentheses.

 $('.test').click(function(e) { var counter = 0; // in reality this is a dynamic value var fieldvalue = $("#fieldID").val(); if (parseInt(fieldvalue) >= 1) { counter = fieldvalue; } else { counter = 0; } console.log(counter) }); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script> <input type="text" id="fieldID"> <input type="button" value="fieldID" class="test"> 

Answer 2

The correct variable seems to be fieldvalue and not fieldcounter . The >= comparison must be done outside the parseInt function. counter must also receive the result of the parseInt funcion, otherwise it could receive a String.

var fieldvalue = parseInt($("#fieldID").val());
if (fieldvalue >= 1) {
    counter = fieldvalue;