how to activate a textbox if I select an other option in drop down box

Question

suppose I ve a 3 options in a drop down box say red   blue  others      If a user select option as an others then below a text box should be visible to wrtie his own favourite color      I can populate the drop down box with colors but do not know how to bring textbox visible on selection of others in the      drop-down box  I know that using javascript it is possible to do but I am quite new to javascript  can anybody please help me      out    This is the select option I am implementing in my html form      lt select name  color  gt     color      lt option gt pick a color lt  option gt         lt option value  red  gt RED lt  option gt       lt option value  blue  gt BLUE lt  option gt       lt option value  others  gt others lt  option gt   lt  select gt    lt input type  text  name  color  id  color    gt  lt  td gt     this textbox should be hidden   until unless others is selected in the drop down box

User · Answer

Simply   lt select id    color2          name    color          onchange    if      color2   val       others                               color   show                          else                             color   hide                           gt     lt option value  red  gt RED lt  option gt     lt option value  blue  gt BLUE lt  option gt     lt option value  others  gt others lt  option gt   lt  select gt    lt input type    text         name    color         id    color    gt    edit  requires JQuery plugin

User · Answer

This will submit the right form response  i e  Select value most of the time  and Input value when the Select box is set to  others    Uses jQuery        select name  color     change function        new value     this  val        if  new value     others              input name  color     show                else            input name  color     val new value            input name  color     hide

User · Answer

Inline    lt select  onchange  var val   this options this selectedIndex  value  this form color 1  style display  val   others    block   none   gt    I used to do this  In the head  give the select an ID    window onload function       var sel   document getElementById  color      sel onchange function         var val   this options this selectedIndex  value      if  val     others           var newOption   prompt  Your own color             if  newOption            this options this options length-1  text   newOption          this options this options length-1  value   newOption          this options this options length    new Option  other   other

User · Answer

As Umesh Patil answer have comment say that there is problem  I try to edit answer and get reject  And get suggest to post new answer  This code should solve problem they have  Shashi Roy  Gaven  John Higgins     lt html gt    lt head gt     lt script type  text javascript  gt  function CheckColors val    var element document getElementById  othercolor     if val   others      element style display  block    else      element style display  none       lt  script gt    lt  head gt   lt body gt     lt select name  color  onchange  CheckColors this value    gt        lt option gt pick a color lt  option gt         lt option value  red  gt RED lt  option gt       lt option value  blue  gt BLUE lt  option gt       lt option value  others  gt others lt  option gt     lt  select gt   lt input type  text  name  othercolor  id  othercolor  style  display none    gt   lt  body gt   lt  html gt

User · Answer

Below is the core JavaScript you need to write    lt html gt    lt head gt     lt script type  text javascript  gt  function CheckColors val    var element document getElementById  color     if val   pick a color   val   others      element style display  block    else      element style display  none       lt  script gt    lt  head gt   lt body gt     lt select name  color  onchange  CheckColors this value    gt        lt option gt pick a color lt  option gt         lt option value  red  gt RED lt  option gt       lt option value  blue  gt BLUE lt  option gt       lt option value  others  gt others lt  option gt     lt  select gt   lt input type  text  name  color  id  color  style  display none    gt   lt  body gt   lt  html gt

User · Answer

Coded an example at http   jsbin com orisuv  HTML   lt select name  color  onchange  checkvalue this value   gt        lt option gt pick a color lt  option gt         lt option value  red  gt RED lt  option gt       lt option value  blue  gt BLUE lt  option gt       lt option value  others  gt others lt  option gt   lt  select gt    lt input type  text  name  color  id  color  style  display none   gt    Javascript   function checkvalue val        if val    others          document getElementById  color   style display  block       else        document getElementById  color   style display  none

[javascript] how to activate a textbox if I select an other option in drop down box

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