Validating form

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  • mainul
    New Member
    • Sep 2006
    • 51
    #1

    Validating form

    Hi
    i dont have much idea in javascript.i have a web application where i would like to validate a text field. user will only be able to insert floating number (like 4.5, 10.45). no letter will be allowed.

    please assit.

    Best regards
    Mainul
    Tags: None
    • dmjpro
      Top Contributor
      • Jan 2007
      • 2476
      #2
      try thsi code in js
      function validate()
      {
      // to access text value do ======= document.all.te xtfield_name.va lue
      }
      plz send me what u want to do
      i am online

        Comment

        • acoder
          Recognized Expert MVP
          • Nov 2006
          • 16032
          #3
          If you know regular expressions, use the following for floating point number:
          Code:
          /^((\d+(\.\d*)?)|((\d*\.)?\d+))$/
          then test:
          Code:
          var reFloat = /^((\d+(\.\d*)?)|((\d*\.)?\d+))$/
if (!reFloat.test(yourformfield)) alert("Error: not a floating point number")

            Comment

            • acoder
              Recognized Expert MVP
              • Nov 2006
              • 16032
              #4
              Originally posted by dmjpro
              try thsi code in js
              function validate()
              {
              // to access text value do ======= document.all.te xtfield_name.va lue
              }
              plz send me what u want to do
              i am online
              document.all is old code and IE-specific. You should use document.getEle mentById("textf ieldid").value instead.

                Comment

                • dmjpro
                  Top Contributor
                  • Jan 2007
                  • 2476
                  #5
                  sorrryyyyyyyyyy yyyyy
                  without reading the problem i responded...
                  u can stop user to press alphabatic word...
                  try this code ....
                  <input type = text onkeypress = test()>

                  function test()
                  {
                  if(!(event.keyC ode>=49&&event. keyCode<=57)) event.keyCode = 0;
                  if(event.keyCod e == point_keycode && event.srcElemen t.value.indexOf ('.') == -1) event.keyCode = 0;
                  }

                  to get the point_keycode try this code ...
                  <body onkeypress = test()>
                  function test()
                  {
                  alert(event.key Code);
                  }

                  plz press any key u want to know it's keyCode..
                  plz maintain the case sensivity while u writing the code..
                  any problem while u write the code plz send me ur problem.....
                  i am online

                    Comment

                    • mainul
                      New Member
                      • Sep 2006
                      • 51
                      #6
                      thanks a lot guys for quick response. let me try the codes.

                      best regards
                      Mainul

                        Comment

                        • dmjpro
                          Top Contributor
                          • Jan 2007
                          • 2476
                          #7
                          ok try it quickly and send me ur result
                          i am eager to know the result

                            Comment

                            • karthi84
                              Contributor
                              • Dec 2006
                              • 270
                              #8
                              Originally posted by dmjpro
                              sorrryyyyyyyyyy yyyyy
                              without reading the problem i responded...
                              u can stop user to press alphabatic word...
                              try this code ....
                              <input type = text onkeypress = test()>

                              function test()
                              {
                              if(!(event.keyC ode>=49&&event. keyCode<=57)) event.keyCode = 0;
                              if(event.keyCod e == point_keycode && event.srcElemen t.value.indexOf ('.') == -1) event.keyCode = 0;
                              }

                              to get the point_keycode try this code ...
                              <body onkeypress = test()>
                              function test()
                              {
                              alert(event.key Code);
                              }

                              plz press any key u want to know it's keyCode..
                              plz maintain the case sensivity while u writing the code..
                              any problem while u write the code plz send me ur problem.....
                              i am online
                              hi dmjpro,
                              the coding is good. can u get me the key code for special keys like *,-,+ etc.

                                Comment

                                • dmjpro
                                  Top Contributor
                                  • Jan 2007
                                  • 2476
                                  #9
                                  can't u get it from my code.....

                                    Comment

                                    • acoder
                                      Recognized Expert MVP
                                      • Nov 2006
                                      • 16032
                                      #10
                                      To get the event code across all browsers and not just IE, use
                                      Code:
                                      function setEvent(Id) {
 Id.onkeypress = function keyPress(evt) { 
  if (evt) 
   keyCode = evt.keyCode ;
  else  
   keyCode = event.keyCode ;
 alert(keyCode);
 }
}
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