JS指定光标位置插入内容

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

    //ie下 textarea失去焦点前要保存rang对象
    var rie; //全局变量
    function GetCursor() {
        if (document.all) {//IE要保存Range
            var obj = document.getElementById('content');
            obj.focus();
            rie = document.selection.createRange();
        }
    }
    GetCursor();
    function insertText(str,contentId) {
        var obj = document.getElementById(contentId);
        if (document.selection) { //ie
            obj.focus();//先激活当前对象
            rie.text = str;
        } else if (typeof obj.selectionStart === 'number' && typeof obj.selectionEnd === 'number') { //非ie
            var startPos = obj.selectionStart,
                endPos = obj.selectionEnd,
                cursorPos = startPos,
                tmpStr = obj.value;
            obj.value = tmpStr.substring(0, startPos) + str + tmpStr.substring(endPos, tmpStr.length);
            cursorPos += str.length;
            obj.selectionStart = obj.selectionEnd = cursorPos;
        } else {
            obj.value += str;
        }
    }
    insertText(哈哈,"J-content");

//ie下 textarea失去焦点前要保存rang对象 var rie; //全局变量 function GetCursor() { if (document.all) {//IE要保存Range var obj = document.getElementById('content'); obj.focus(); rie = document.selection.createRange(); } } GetCursor(); function insertText(str,contentId) { var obj = document.getElementById(contentId); if (document.selection) { //ie obj.focus();//先激活当前对象 rie.text = str; } else if (typeof obj.selectionStart === 'number' && typeof obj.selectionEnd === 'number') { //非ie var startPos = obj.selectionStart, endPos = obj.selectionEnd, cursorPos = startPos, tmpStr = obj.value; obj.value = tmpStr.substring(0, startPos) + str + tmpStr.substring(endPos, tmpStr.length); cursorPos += str.length; obj.selectionStart = obj.selectionEnd = cursorPos; } else { obj.value += str; } } insertText(哈哈,"J-content");