javascript: making a calendar navigation bar -


when click on function goes wrong. problem. struggle few month on this. click on button , exepect month number increase or decrease. , show me right result.

<!doctype html> <html> <style> table { border-collapse:collapse; } table img { width:50px; height:50px; } td,table { border-color:blue; text-align:center; } td:hover { cursor:pointer; background-color:yellow; } </style> <head> </head> <body> <script>   var date=new date(); var mn=['jan','feb','mar','apr','may','jun','jul','aug','sep','oct','nov','dec']; y=date.getfullyear(); m=date.getmonth();  function preyear() {     y -= 1;     calendar(); } function premonth(){     m -= 1;     calendar(); } function nextmonth(){     m += 1;     calendar(); } function nextyear(){     y += 1;     calendar(); } function today(){     y=date.getfullyear();     m=date.getmonth();     calendar(); }  function calendar(){ document.write("<table border=1><tr><td colspan=8>"+mn[m]+' '+y+"</td></tr>"); document.write("<tr><td  colspan='8'><button value='preyear' onclick='preyear()'><button value='premonth' onclick='premonth()'><button value = 'today' onclick = 'today()'><button value = 'nextmonth' onclick='nextmonth()'><button value = 'nextyear' onclick = 'nextyear()'></td></tr>"); document.write ("<tr><td>s</td><td>m</td><td>t</td><td>w</td><td>t</td><td>f</td><td>s</td><td>w</td></tr>"); document.write("<tr>"); (var i=1; i<43; i++){ var fday=new date(y,m,1); days=new date(y,m,i-fday.getday()); if (days.todatestring()== date.todatestring()){     document.write("<td style=color:red>"+days.getdate()+"</td>");     } else{     document.write("<td>"+days.getdate()+"</td>");     } if (i%7 == 0){     var onejan=new date(y,0,1);     document.write("<td>"+math.ceil(((days-onejan)/(60*60*24*1000)+1)/7)    +"</td></tr><tr>");     } }        document.write("</tr></table>");     } calendar(); </script>  </body> </html>

when using document.write second time calender function called, rewriting whole html , <head> tags gets lost.

that happens when use document.write after page finished loading, should use instead:

<!doctype html> <html> <style> table { border-collapse:collapse; } table img { width:50px; height:50px; } td,table { border-color:blue; text-align:center; } td:hover { cursor:pointer; background-color:yellow; } </style> <head> </head> <body> <script>   var date=new date(); var mn=['jan','feb','mar','apr','may','jun','jul','aug','sep','oct','nov','dec']; y=date.getfullyear(); m=date.getmonth();  function preyear() {     y -= 1;     calendar(); } function premonth(){     m -= 1;     calendar(); } function nextmonth(){     m += 1;     calendar(); } function nextyear(){     y += 1;     calendar(); } function today(){     y=date.getfullyear();     m=date.getmonth();     calendar(); }  function calendar(){     var html = "";      html += "<table border=1><tr><td colspan=8>"+mn[m]+' '+y+"</td></tr>";     html += "<tr><td  colspan='8'><button value='preyear' onclick='preyear()'><button value='premonth' onclick='premonth()'><button value = 'today' onclick = 'today()'><button value = 'nextmonth' onclick='nextmonth()'><button value = 'nextyear' onclick = 'nextyear()'></td></tr>";     html += "<tr><td>s</td><td>m</td><td>t</td><td>w</td><td>t</td><td>f</td><td>s</td><td>w</td></tr>";     html += "<tr>";     (var i=1; i<43; i++){     var fday=new date(y,m,1);     days=new date(y,m,i-fday.getday());     if (days.todatestring()== date.todatestring()){         html += "<td style=color:red>"+days.getdate()+"</td>";         }     else{         html += "<td>"+days.getdate()+"</td>";         }     if (i%7 == 0){         var onejan=new date(y,0,1);         html += "<td>"+math.ceil(((days-onejan)/(60*60*24*1000)+1)/7)    +"</td></tr><tr>";         }     }            html += "</tr></table>";         document.body.innerhtml = html; } calendar(); </script>  </body> </html>

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