Javascript scope -- var vs global -


for currentunknownbox, if use "var" expected functionality not work expected (currentunknownbox becomes first element clicked). if remove var, works expected. assuming has global scope. explain me?

jquery(".box.unknown").live('click',function() {     var currentunknownbox = this;      //if not on mobile, use jquery ui dialog     if (!drupal.settings.is_mobile)     {         jquery("#letter-input-dialog").dialog();          jquery('#letter_input_form').submit(function()         {             var letter = jquery("#letter_input").val();             jquery("#letter-input-dialog").dialog('close');             jquery("#letter_input").val('');             that.validateandsaveletter(currentunknownbox, letter);             //do not let form submit             return false;         });     }     else     {         var letter = prompt('please enter letter use in guess');         that.validateandsaveletter(that.currentunknownbox, letter);     } });

edit: problem re-declaring submit function every time.

the problem every time 1 of these clicked, you're adding new submit event handler form. first 1 fire first. when don't declare var, you're overwriting variable that first handler looking at. mistake adding new handler every time. so:

var currentunknownbox; jquery('#letter_input_form').submit(function()     {         var letter = jquery("#letter_input").val();         jquery("#letter-input-dialog").dialog('close');         jquery("#letter_input").val('');         that.validateandsaveletter(currentunknownbox, letter);         //do not let form submit         return false;     }); jquery("#letter-input-dialog").dialog({autoopen: false});  jquery(".box.unknown").live('click',function(){     currentunknownbox = this;      //if not on mobile, use jquery ui dialog     if (!drupal.settings.is_mobile)      {        jquery("#letter-input-dialog").dialog('open');       } else {         var letter = prompt('please enter letter use in guess');        that.validateandsaveletter(currentunknownbox, letter);       }    });

incidentally, .live deprecated. should use .on instead.


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