html - Validation of textbox in javascript based on option selected -

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i using javascript validate text box based on option selected not able process new http requests after processing text box validation page. don't understand issue script.code seems lengthier.i have new frame used new http request after processing page not able open new http page in side menu bar of new frame. find problem when dumped code in our embedded device.can u please me in solving problem?

  <script type="text/javascript">   var txtbox=new array("destip","frms");   var txtbox2=new array("destip","frms");   function chkipv4()   {     var x;if(document.getelementbyid(txtbox[0]).value.length==0){alert(document.getelementbyid(txtbox[0]).name+" not valid");document.getelementbyid(txtbox[0]).focus();return false;}for(x=0;x<1;x++){obj=document.getelementbyid(txtbox[x]);name=obj.name;val=obj.value;len=val.length;if(len<=15){var i;var ascii1=0;var decvalue=0;var decvalueflag=0;var dotcount=0;var dotflag=0;var dot=0;var dec=0;for(i=0;i<len;i++){var ascii= val.charat(i);if(i==len-1 && ascii =='.'){alert(name +" not valid");obj.focus();return false;}if(ascii=='.' && dot ==1){dotcount++;dotflag=1;}else if(ascii=='.'){dotcount++;dot=1;}else{dot=0;}}if(dotcount!=3 || dotflag==1){dotcount=0;dot=0;dotflag=0;alert(name +" not valid");obj.focus();return false;}for(i=0;i<len;i++){var ascii=val.charcodeat(i);if(ascii<48||ascii>57){if(val.charat(i)!='.'){alert(name+ " not valid");obj.focus();return false;}}}for(i=0;i<len;i++){ascii1=val.charcodeat(i);dec=ascii1-48;if(ascii1!=46){decvalue=(decvalue*10) +dec;}else{if(decvalue<0 || decvalue>255){alert(name+ " not valid");obj.focus();return false;}decvalue=0;}if(decvalue<0 || decvalue>255){alert(name+ " not valid");obj.focus();return false;}}}}for(x=1;x<txtbox.length;x++){obj=document.getelementbyid(txtbox[x]);name=obj.name;val=obj.value;len=val.length;var i;var dec=0;var decvalue=0;for(i=0;i<len;i++){var ascii=val.charcodeat(i);if(ascii<48 || ascii>57){alert(document.getelementbyid(txtbox[x]).name+" not valid");document.getelementbyid(txtbox[x]).focus();return false;}else{ascii=val.charcodeat(i);dec=ascii-48;if(ascii!=46){decvalue=(decvalue*10) +dec;}else{if(decvalue<1 || decvalue>16){alert(name+ " not valid");obj.focus();return false;}decvalue=0;}if((x==1 &&(decvalue>999))){alert(name+ " not valid");obj.focus();return false;}}}}     obj=document.getelementbyid(txtbox[1]);name=obj.name;val=obj.value;len=val.length;var i;     if(len != 0){for(i=0;i<len;i++){var ascii=val.charcodeat(i);if(ascii<48 || ascii>57){alert(document.getelementbyid(txtbox[1]).name+" not valid");document.getelementbyid(txtbox[1]).focus();return false;}}if(val<1 || val >50){alert(document.getelementbyid(txtbox[1]).name+" not valid, enter 1 50");document.getelementbyid(txtbox[1]).focus();return false;}}}   function chkipv6()   {      var x;for(x=0;x<txtbox2.length;x++){if(document.getelementbyid(txtbox2[x]).value.length==0){alert(document.getelementbyid(txtbox2[x]).name+" not valid");document.getelementbyid(txtbox2[x]).focus();return false;}}for(x=0;x<1;x++){obj1=document.getelementbyid(txtbox2[x]);name1=obj1.name;  val1=obj1.value;len1=val1.length;if(len1<=39){var i;var ascii=0;var ipv6decvalue=0;var charvalue=0;var coloncount=0;var doublecoloncount=0;var colonflag=0;var colon=0;var ipv6=0;var ascii = [ ];for(i=0;i<len1;i++){ascii[i]=val1.charat(i);if(i==len1-1 && ascii[i] ==':'){alert(name1 +" not valid");obj1.focus();return false;}if(ascii[i]==':' && colon ==1){coloncount++;colonflag=1;}else if(ascii[i]==':'){coloncount++;colon=1;}else{colon=0;}if(ascii[i-1]==':' && ascii[i]==':'){doublecoloncount++;}}if(doublecoloncount > 1){alert(name1 +" not valid");obj.focus();return false;}else if(coloncount <7 && len1<39 && doublecoloncount!=1){coloncount=0;colon=0;colonflag=0;doublecoloncount=0;alert(name1 +" not valid");obj.focus();return false;}else if(coloncount <7 && len1<39 && doublecoloncount>1){coloncount=0;colon=0;colonflag=0;doublecoloncount=0;alert(name1 +" not valid");obj.focus();return false;}else if(coloncount >7 || coloncount<1){coloncount=0;colon=0;colonflag=0;doublecoloncount=0;alert(name1 +" not valid");obj.focus();return false;}for(i=0;i<len1;i++){var ascii=val1.charcodeat(i);if((ascii<48||ascii>57) && (ascii<65||ascii>70) && (ascii<97||ascii>102)){if(val1.charat(i)!=':'){alert(name1+" not valid");obj1.focus();return false;}}}for(i=0;i<len1;i++){ascii=val1.charcodeat(i);ipv6=ascii-48;if((ascii>=65 && ascii<=70) && ascii!=58){charvalue = ascii;}else{if(ascii<'a' || ascii>'f'){alert(name1+ "is not valid");obj.focus();return false;}charvalue=0;}if((ascii>=97 && ascii<=102) && ascii!=58){charvalue = ascii;}else{if(ascii<'a' || ascii>'f'){alert(name1+ "is not valid");obj.focus();return false;}charvalue=0;}if(charvalue < 'a' || charvalue > 'f'){alert(name1+ "is not valid");obj.focus();return false;}if(charvalue < 'a' || charvalue > 'f'){alert(name1+ "is not valid");obj.focus();return false;}}}}for(x=1;x<txtbox.length;x++){obj=document.getelementbyid(txtbox[x]);name=obj.name;val=obj.value;len=val.length;var i;var dec=0;var decvalue=0;for(i=0;i<len;i++){var ascii=val.charcodeat(i);if(ascii<48 || ascii>57){alert(document.getelementbyid(txtbox[x]).name+" not valid");document.getelementbyid(txtbox[x]).focus();return false;}else{ascii=val.charcodeat(i);dec=ascii-48;if(ascii!=46){decvalue=(decvalue*10) +dec;}else{if(decvalue<1 || decvalue>16){alert(name+ " not valid");obj.focus();return false;}decvalue=0;}if((x==1 &&(decvalue>999))){alert(name+ " not valid");obj.focus();return false;}}}}      obj=document.getelementbyid(txtbox[1]);name=obj.name;val=obj.value;len=val.length;var i;      if(len != 0){for(i=0;i<len;i++){var ascii=val.charcodeat(i);if(ascii<48 || ascii>57){alert(document.getelementbyid(txtbox[1]).name+" not valid");document.getelementbyid(txtbox[1]).focus();return false;}}if(val<1 || val >50){alert(document.getelementbyid(txtbox[1]).name+" not valid, enter 1 50");document.getelementbyid(txtbox[1]).focus();return false;}}}   }   function chkfunc()   {        var selectedindex = document.f1.ipver.selectedindex;      var optionvalue = document.f1.ipver.options[selectedindex].value;      switch(optionvalue)      {         case "1":return chkipv4();                  break;         case "2":return chkipv6();                  break;      }   }    <form name="f1" action=" " method="post" onsubmit="return chkfunc();">    <select name="ipver" id="ipver" tabindex="19"><option value="3">no change</option><option value="1">ipv4</option><option value="2">ipv6</option></select></td></tr>


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