jQuery Watermarked input and validation

Question

On a HTML page I have an inputbox that has a \'watermark\' on it when it is empty. (eg: \"enter text here...\"). Kind of like this: http://digitalbush.com/projects/watermark

Answer 1

Not sure how the validation plugin works, but this is a separate module that is usable.

   var SetWatermark = function( oElemToWatermark, sWatermark )
   {
      var CheckFocus = function(oEvent)
      {
         var oElem = $(this);

         if ( oElem.val() == oElem.data("Watermark") )
            oElem.val("").css("color", "");
      }

      var CheckBlur = function(oEvent)
      {
         var oElem = $(this);

         if ( oElem.val().length == 0 )
            oElem.val( oElem.data("Watermark") ).css("color", "Grey");
      }

      // HTML5 (simple route)
      if ( oElemToWatermark[0].placeholder != undefined )
         oElemToWatermark[0].placeholder = sWatermark;

      // pre HTML5 (manual route)
      else if (oElemToWatermark.data("Watermark") == undefined)
         oElemToWatermark  .data("Watermark", sWatermark)
                           .val(sWatermark)
                           .on("focus", CheckFocus )
                           .on("blur",  CheckBlur  );
   }

   var GetWatermarkText = function(oElem)
   {
      if (oElem[0].plaeholder != undefined)
         return oElem[0].placeholder;
      else if ( oElem.data("Watermark") != undefined )
         return oElem.data("Watermark");
      else
      { 
         alert("The element " + oElem[0].id + " does not have a Watermark value.");
         return "";
      }
   }

   var GetWatermarkValue = function(oElem)
   {
      var sVal       = oElem.val();
      var sWatermark = oElem.data("Watermark");

      if (oElem[0].placeholder   != undefined 
      ||  sWatermark             == undefined 
      ||  sWatermark             != sVal)
         return sVal;
      else if (sVal == sWatermark)
         return "";
   }