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JS typeof related question

Discussion in 'JavaScript' started by afridy, Aug 28, 2013.

  1. #1
    [Hello,

    i want to check weather a text box is exisit or not using typeof.
    but i have some confusing on the syntax.

    
    <input name="empno" type="text" id="empno" size="15" />
    
    Code (markup):
    is this syntax correct?
    
    if (typeof empno=='object') {
    
    Code (markup):
    because i have some confusing weather i need rap empno in single quote.
     
    afridy, Aug 28, 2013 IP
  2. HuggyStudios

    HuggyStudios Well-Known Member

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    #2
    HuggyStudios, Aug 28, 2013 IP
    afridy likes this.
  3. afridy

    afridy Well-Known Member

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    #3
    afridy, Aug 28, 2013 IP
  4. JoeSimmons

    JoeSimmons Greenhorn

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    #4
    You can just check if it's truthy or not.

    var empno = document.getElementById('empno');
    
    if (empno) {
      // exists
    }
    Code (markup):
     
    JoeSimmons, Aug 28, 2013 IP
  5. afridy

    afridy Well-Known Member

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    #5
    no buddy, that text box (id empno) may exist some time and some time not in the form, so i want to check weather that text box is present or not.
     
    afridy, Aug 28, 2013 IP
  6. JoeSimmons

    JoeSimmons Greenhorn

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    #6
    The code that I posted will check if that element exists or not.
     
    JoeSimmons, Aug 29, 2013 IP