JS向文本框光标位置插入内容-WP新手学园

insertText(obj, str) {
            if (document.selection) {
                var sel = document.selection.createRange();
                sel.text = str;
            } else if (typeof obj.selectionStart === 'number' && typeof obj.selectionEnd === 'number') {
                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;
                //选择焦点的位置
                obj.setSelectionRange(obj.selectionStart, obj.selectionStart);
            } else {
                obj.value += str;
            }
            //重新获得焦点
            obj.focus();
        }

insertText(obj, str) {

if (document.selection) {

var sel = document.selection.createRange();

sel.text = str;

} else if (typeof obj.selectionStart === 'number' && typeof obj.selectionEnd === 'number') {

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;

//选择焦点的位置

obj.setSelectionRange(obj.selectionStart, obj.selectionStart);

} else {

obj.value += str;

}

//重新获得焦点

obj.focus();

}

使用方法：

var templateContent = document.getElementById("txtRemark");
var content = "test";
insertText(templateContent, content);

var templateContent = document.getElementById("txtRemark");

var content = "test";

insertText(templateContent, content);