re

function get_caret_position(obj){
    obj.focus();
    if(document.selection){
        if(obj.tagName=='INPUT'){
            var range=document.selection.createRange();
            return{
                start:-range.moveStart('character',-obj.value.length),
                    end:-range.moveEnd('character',-obj.value.length)
                    };
        }else if(obj.tagName=='TEXTAREA'){
            var range=document.selection.createRange();
            var range2=range.duplicate();
            range2.moveToElementText(obj);
            range2.setEndPoint('StartToEnd',range);
            var end=obj.value.length-range2.text.length;
            range2.setEndPoint('StartToStart',range);
            return{
                start:obj.value.length-range2.text.length,
                    end:end
                    };
        }else{
            return{
                start:undefined,
                    end:undefined
                    };
        }
    }else{
        return{
            start:obj.selectionStart,
                end:obj.selectionEnd
                };
    }
}
function set_caret_position(obj,start,end){
    if(document.selection){
        if(obj.tagName=='TEXTAREA'){
            var i=obj.value.indexOf("\r",0);
            while(i!=-1&&i<end){
                end--;
                if(i<start){start--;}
                i=obj.value.indexOf("\r",i+1);
            }
        }
        var range=obj.createTextRange();
        range.collapse(true);
        range.moveStart('character',start);
        if(end!=undefined){
            range.moveEnd('character',end-start);
        }
        range.select();
    }else{
        obj.selectionStart=start;
        var sel_end=end==undefined?start:end;
        obj.selectionEnd=Math.min(sel_end,obj.value.length);
        obj.focus();
    }
}


// 如果插入字符动作是在鼠标事件中操作，
// 最好在mousedown动作中保存光标位置，
// 否则失去焦点的时候有些浏览器会将光标会复位

// text_obj , input or textarea
// var pos = get_caret_position(text_obj);

   var text = '[插入字符]';
    var str_len = text_obj.value.length;

    var str1 = str.substring(0,pos.start);
    var str2 = str.substring(pos.end,str_len);

    text_obj.value = str1+text+str2;

//恢复光标到插入字符后
set_caret_position(text_obj,pos.start+text.length,pos.start+text.length);


【 在 sly9 (弱) 的大作中提到: 】
: firefox下input标签有属性：selectionStart
: 用这个自己切一下字符串即可
: 你不觉得这个很难受么……至少我觉得和我的逻辑顺序不太一样。。
--
FROM 125.120.147.*