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118 lines
3.3 KiB
118 lines
3.3 KiB
var TEXTAREA_HELP = {
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/*
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* 获取光标位置
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* @Method getCursorPosition
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* @param t element
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* @return number
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*/
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getCursorPosition: function(t){
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if (document.selection) {
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t.focus();
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var ds = document.selection;
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var range = ds.createRange();
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var stored_range = range.duplicate();
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stored_range.moveToElementText(t);
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stored_range.setEndPoint("EndToEnd", range);
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t.selectionStart = stored_range.text.length - range.text.length;
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t.selectionEnd = t.selectionStart + range.text.length;
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return t.selectionStart;
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} else return t.selectionStart;
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},
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/*
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* 设置光标位置
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* @Method setCursorPosition
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* @param t element
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* @param p number
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* @return
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*/
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setCursorPosition:function(t, p){
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this.sel(t,p,p);
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},
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/*
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* 插入到光标后面
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* @Method add
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* @param t element
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* @param txt String
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* @return
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*/
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add:function (t, txt){
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// var val = t.value;
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if(document.selection){
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t.focus();
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document.selection.createRange().text = txt;
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} else {
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var cp = t.selectionStart;
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var ubbLength = t.value.length;
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var s = t.scrollTop;
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// document.getElementById('aaa').innerHTML += s + '<br/>';
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t.value = t.value.slice(0,t.selectionStart) + txt + t.value.slice(t.selectionStart, ubbLength);
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this.setCursorPosition(t, cp + txt.length);
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// document.getElementById('aaa').innerHTML += t.scrollTop + '<br/>';
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firefox=navigator.userAgent.toLowerCase().match(/firefox\/([\d\.]+)/) && setTimeout(function(){
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if(t.scrollTop != s) t.scrollTop=s;
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},0);
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};
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},
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/*
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* 删除光标 前面或者后面的 n 个字符
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* @Method del
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* @param t element
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* @param n number n>0 后面 n<0 前面
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* @return
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* 重新设置 value 的时候 scrollTop 的值会被清0
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*/
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del:function(t, n){
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var p = this.getCursorPosition(t);
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var s = t.scrollTop;
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var val = t.value;
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t.value = n > 0 ? val.slice(0, p - n) + val.slice(p):
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val.slice(0, p) + val.slice(p - n);
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this.setCursorPosition(t ,p - (n < 0 ? 0 : n));
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firefox=navigator.userAgent.toLowerCase().match(/firefox\/([\d\.]+)/) && setTimeout(function(){
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if(t.scrollTop != s) t.scrollTop=s;
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},10);
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},
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/*
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* 选中 s 到 z 位置的文字
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* @Method sel
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* @param t element
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* @param s number
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* @param z number
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* @return
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*/
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sel:function(t, s, z){
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if(document.selection){
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var range = t.createTextRange();
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range.moveEnd('character', -t.value.length);
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range.moveEnd('character', z);
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range.moveStart('character', s);
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range.select();
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}else{
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t.setSelectionRange(s,z);
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t.focus();
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}
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},
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/*
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* 选中一个字符串
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* @Method sel
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* @param t element
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* @param s String
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* @return
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*/
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selString:function(t, s){
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var index = t.value.indexOf(s);
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index != -1 ? this.sel(t, index, index + s.length) : false;
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}
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}; |