zh/searchurl/textarea.js

   1 var textarea;
   2 onload=function(){
   3   textarea=document.getElementsByTagName('textarea')[0];
   4 }
   5
   6 function getNewlinePos_back(text,pos){
   7   while(pos>=0 && text.charAt(pos)!='\n') pos--;
   8   return pos;
   9 }
  10
  11 function getNewlinePos_forth(text,pos){
  12   let len = text.length;
  13   while(pos<len && text.charAt(pos)!='\n') pos++;
  14   return pos;
  15 }
  16
  17 function deleteLine(ta){
  18   let text = ta.value;
  19   let lStart = getNewlinePos_back(text,ta.selectionStart-1);
  20   let lEnd = getNewlinePos_forth(text,ta.selectionEnd);
  21   ta.value = text.substring(0,lStart+1) + text.substring(lEnd+1);
  22   ta.selectionStart = ta.selectionEnd = lStart +1;
  23   ta.focus();
  24 }
  25
  26 function moveUp(ta){
  27   let text = ta.value;
  28   let start = ta.selectionStart;
  29   let end = ta.selectionEnd;
  30   let lStart = getNewlinePos_back(text,start-1);
  31   let lEnd = getNewlinePos_forth(text,end);
  32   let prevS = getNewlinePos_back(text,lStart-1);
  33   ta.value = text.substring(0,prevS+1)+text.substring(lStart+1,lEnd+1)+
  34     text.substring(prevS+1,lStart+1) + text.substring(lEnd+1);
  35   ta.selectionStart = start - (lStart - prevS);
  36   ta.selectionEnd = end - (lStart - prevS);
  37   ta.focus();
  38 }
  39
  40 function move2Top(ta){
  41   let text = ta.value;
  42   let start = ta.selectionStart;
  43   let end = ta.selectionEnd;
  44   let lStart = getNewlinePos_back(text,start-1);
  45   let lEnd = getNewlinePos_forth(text,end);
  46   ta.value = text.substring(lStart+1,lEnd+1)+text.substring(0,lStart+1)+
  47     text.substring(lEnd+1);
  48   ta.selectionStart = start - lStart-1;
  49   ta.selectionEnd = end - lStart-1;
  50   ta.focus();
  51 }
  52
  53 function move2Bottom(ta){
  54   let text = ta.value;
  55   let start = ta.selectionStart;
  56   let end = ta.selectionEnd;
  57   let lStart = getNewlinePos_back(text,start-1);
  58   let lEnd = getNewlinePos_forth(text,end);
  59   ta.value = text.substring(0,lStart+1)+text.substring(lEnd+1)+
  60     text.substring(lStart+1,lEnd+1);
  61   ta.selectionStart = start + text.length - lEnd-1;
  62   ta.selectionEnd = end + text.length - lEnd-1;
  63   ta.focus();
  64 }
  65
  66 function moveDown(ta){
  67   let text = ta.value;
  68   let start = ta.selectionStart;
  69   let end = ta.selectionEnd;
  70   let lStart = getNewlinePos_back(text,start-1);
  71   let lEnd = getNewlinePos_forth(text,end);
  72   let nextE = getNewlinePos_forth(text,lEnd+1);
  73   ta.value = text.substring(0,lStart+1) + text.substring(lEnd+1,nextE+1) +
  74     text.substring(lStart+1,lEnd+1)+text.substring(nextE+1);
  75   ta.selectionStart = start + (nextE - lEnd);
  76   ta.selectionEnd = end + (nextE - lEnd);
  77   ta.focus();
  78 }
  79
  80 function save(fn){
  81   let u8=new TextEncoder().encode(textarea.value);let r='';for(let i=0;i<u8.byteLength;i++)r+=String.fromCharCode(u8[i]);location.href='i:0l'+fn+':'+btoa(r);
  82 }
  83
  84 function onSave(){
  85   save(location.pathname);
  86 }