Object and function of JS client database

There are times when you want to use the client database on a Web page, but in order to be compatible with the version of the browser does not support XML technology, so here is a number of JS DML functions I want interested friends to discuss


function Trform ()


{


this. Trrc=new Array ();


this. Qrc=new Array ();//Result





this.currentrc=1;//current record pointer


this.lastrc=0;//Final Record


this. Number of rclength=arguments.length;//fields





this. Trrc[0]=new Array ();//Field name





for (i=0;i<this. rclength;i++) this. Trrc[0][i]=arguments[i];





THIS.ADDRC=ADDRC; Add a record


this.showrc=showrc;//Print current record


this.showprevious=showprevious;


This.shownext=shownext;





This.preload=preload; Pre-loaded Image


this.item2index=item2index;//The index of the field name to the array


This.showthis=showthis;


this. Isright=isright;


This.seek=seek;








}





function ADDRC ()


{


this. Trrc[++this.lastrc]=new Array ();


for (i=0;i<this. rclength;i++) this. Trrc[this.lastrc][i]=arguments[i];





return true;





}











function SHOWRC () {


for (rc=0;rc<this. qrc[0].length;rc++)


 {


Theel=eval (this. QRC[0][RC]);


 


if (this. Qrc[0][rc].indexof ("image") ==-1) {


Theel.innertext=this. QRC[THIS.CURRENTRC][RC]


  }


else{


Theel.src=this. QRC[THIS.CURRENTRC][RC];


  }


 }


return true;





}





function Shownext () {


This.seek ("All", "all")


if (++THIS.CURRENTRC>THIS.LASTRC) this.currentrc=this.lastrc;


THIS.SHOWRC ();








}





function Showthis () {


This.seek ("All", "all")


THIS.SHOWRC ();





}











function showprevious () {


This.seek ("All", "all");


if (--this.currentrc==0) this.currentrc=1;


THIS.SHOWRC ();





}








function preload () {


if confirm (' You need to load the picture into memory first, this will improve the smoothness of the browsing. If your network is slow, it is recommended not to load ', ' light and Shade ') {


status= ' picture loading ';


var imageindex=new Array ();


var n=0;


for (i=0;i<this. rclength;i++) {


if (this. Trrc[0][i].indexof ("image")!=-1) imageindex[n++]=i;


}  


 


for (i=1;i<=this.lastrc;i++) {


for (var II in imageindex) {


var preimage=new Image ();


Preimage.src=this. TRRC[I][II];


status+= '. '


  }


 }


}


status= ';


return true;





}





function Item2index (item)


{


Val=-1


for (i=0;i<this. rclength;i++)


if (this. Trrc[0][i]==item) val=i;





return Val;





}











function Isright (rc,item,oper,exp)


{








Id=this.item2index (item);








Ends=false;


if (eval ("this. Trrc[rc][id] "+oper+" exp)) Ends=true;








return ends;





}





function Seek (EXP1,ITEM1)


{








var getexp=exp1.split ("@");





this. Qrc=new Array ();





var n=0;


var showitems=new Array ();





if (item1== ' all ") for (i=0;i<this. trrc[0].length;i++) Showitems[i]=this. Trrc[0][i];


else{


for (i=1;i<arguments.length;i++)


Showitems[n++]=arguments[i];


}











this. Qrc[0]=new Array ();


for (m=0;m<showitems.length;m++)


 {


  


this. QRC[0][M]=SHOWITEMS[M];


 }








for (m=0;m<showitems.length;m++)


 {


Showitems[m]=this.item2index (showitems[m]);


 }








temp=1;





if (getexp[0]== ' all ') {


 


for (k=1;k<=this.lastrc;k++)


 {


  


this. Qrc[temp++]=new Array ();


for (i=0;i<showitems.length;i++)


  {


this. Qrc[temp-1][i]=this. Trrc[k][showitems[i]];


  }


 }





 }


Else


 {


for (k=1;k<=this.lastrc;k++)


 {


if (this. Isright (k,getexp[0],getexp[1],getexp[2])


  {


this. Qrc[temp++]=new Array ();


for (i=0;i<showitems.length;i++)


  {


this. Qrc[temp-1][i]=this. Trrc[k][showitems[i]];


  }


  }


 }


 





}

















return this. QRC;





}