- <html>
- <head>
- <title>TEST</title>
- <style>
- body,td{
- font-family: verdana, arial, helvetica, sans-serif;
- font-size: 12px;
- }
- </style>
- <script type="text/javascript">
- var start=0;
- var end=0;
- function add(){
- var textBox = document.getElementById("ta");
- var pre = textBox.value.substr(0, start);
- var post = textBox.value.substr(end);
- textBox.value = pre + document.getElementById("inputtext").value + post;
- }
- function savePos(textBox){
- //如果是Firefox(1.5)的話,方法很簡單
- if(typeof(textBox.selectionStart) == "number"){
- start = textBox.selectionStart;
- end = textBox.selectionEnd;
- }
- //下面是IE(6.0)的方法,麻煩得很,還要計算上'\n'
- else if(document.selection){
- var range = document.selection.createRange();
- if(range.parentElement().id == textBox.id){
- // create a selection of the whole textarea
- var range_all = document.body.createTextRange();
- range_all.moveToElementText(textBox);
- //兩個range,一個是已經選擇的text(range),一個是整個textarea(range_all)
- //range_all.compareEndPoints()比較兩個端點,如果range_all比range更往左(further to the left),則 //返回小於0的值,則range_all往右移一點,直到兩個range的start相同。
- // calculate selection start point by moving beginning of range_all to beginning of range
- for (start=0; range_all.compareEndPoints("StartToStart", range) < 0; start++)
- range_all.moveStart('character', 1);
- // get number of line breaks from textarea start to selection start and add them to start
- // 計算一下\n
- for (var i = 0; i <= start; 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) < 0; end ++)
- 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 <= end; i ++){
- if (textBox.value.charAt(i) == '\n')
- end ++;
- }
- }
- }
- document.getElementById("start").value = start;
- document.getElementById("end").value = end;
- }
- </script>
- </head>
- <body>
- <form action="a.cgi">
- <table border="1" cellspacing="0" cellpadding="0">
- <tr>
- <td>start: <input type="text" id="start" size="3"/></td>
- <td>end: <input type="text" id="end" size="3"/></td>
- </tr>
- <tr>
- <td colspan="2">
- <textarea id="ta" onKeydown="savePos(this)"
- onKeyup="savePos(this)"
- onmousedown="savePos(this)"
- onmouseup="savePos(this)"
- onfocus="savePos(this)"
- rows="14" cols="50"></textarea>
- </td>
- </tr>
- <tr>
- <td><input type="text" id="inputtext" /></td>
- <td><input type="button" onClick="add()" value="Add Text"/></td>
- </tr>
- </table>
- </form>
- </body>
- </html>
javascript獲取textarea光標位置,內容方法(IE, Firefox)
發表評論
所有評論
還沒有人評論,想成為第一個評論的人麼? 請在上方評論欄輸入並且點擊發布.