Use javascript to get the cursor position in textarea_javascript skills

For people who write JavaScript and web page editors, obtaining the cursor position in a textarea is a very important issue, and many people are often at a loss in this area and cannot find a good way. Yesterday I found a piece of javascript code on the Internet. I didn't want to put the original version here because it was so exciting and I was afraid that I would change it, so I'll put the original version here.

var start=0;
var end=0;
function add(){
var textBox = document.getElementById("ta"); value.substr(0, start);
var post = textBox.value.substr(end);
textBox.value = pre document.getElementById("inputtext").value post;
}
function savePos(textBox){
//If it is Firefox (1.5), the method is very simple
if(typeof(textBox.selectionStart) == "number"){
start = textBox.selectionStart;
            end = textBox.selectionEnd;                                                        🎜> var range = document.selection.createRange();
if(range.parentElement().id == textBox.id){
var range = document.selection.createRange(); // create a selection of the whole textarea
var range_all = document.body.createTextRange();
range_all.moveToElementText(textBox);
range_all .compareEndPoints() compares two endpoints. If range_all is further to the left than range, then //Returns a value less than 0, then range_all moves a little to the right until the start of the two ranges is the same.
                // calculate selection start point by moving beginning of range_all to beginning of range
                for (start=0; range_all.compareEndPoints("StartToStart", range)                     range_all.moveStart('character', 1);
                // get number of line breaks from textarea start to selection start and add them to start
                // 计算一下
                for (var i = 0; i                     if (textBox.value.charAt(i) == 'n')
                        start ;
                }
                // create a selection of the whole textarea
                 var range_all = document.body.createTextRange();
                 range_all.moveToElementText(textBox);
                 // calculate selection end point by moving beginning of range_all to end of range
                 for (end = 0; range_all.compareEndPoints('StartToEnd', range)                      range_all.moveStart('character', 1);
                     // get number of line breaks from textarea start to selection end and add them to end
                     for (var i = 0; i                          if (textBox.value.charAt(i) == 'n')
                             end  ;
                     }
                }
            }
        document.getElementById("start").value = start;
        document.getElementById("end").value = end;
    }
The following is how to call js code in the page:

    
        
        
    
    
        
    
    
        
        
    

start:	end:
onKeyup="savePos(this)" <br>                              onmousedown="savePos(this)" <br>                              onmouseup="savePos(this)" <br>                              onfocus="savePos(this)" <br>                              rows="14" cols="50">

 start:  end:



onKeyup="savePos(this)" <br> onmousedown="savePos(this)" onmouseup="savePos(this)" onfocus="savePos(this)"                                                                                                                                                    ="inputtext" /> <td><input type="button" onclick="add()" value="Add Text"></td> 🎜> The original text of this code is: http://blog.csdn.net/liujin4049/archive/2006/09/19/1244065.aspx, thank you! This js code supports both IE and Firefox, which is very exciting. It shows that this person has profound js skills, haha. Btw: I heard that Firefox’s current market share has reached 17%, and IE8 is coming out soon. There will be another life-and-death battle between browsers, and this kind of battle can make browsers The parsing standards will become more and more standardized, and it will become easier and easier for us to write code. This is really something to be happy about.