Jquery在光标位置插入内容

IE下可以通过document.selection.createRange();来实现，而Firefox（火狐）浏览器则需要首先获取光标位置，然后对value进行字符串截取处理

(function($){

`02`	`$.fn.extend({`

`03`	`insertAtCaret:` `function(myValue){`

`04`	`var` `$t=$(this)[0];`

`05`	`if` `(document.selection) {`

`06`	`this.focus();`

`07`	`sel = document.selection.createRange();`

`08`	`sel.text = myValue;`

`09`	`this.focus();`

10 }

11 else

`12`	`if` `($t.selectionStart \|\| $t.selectionStart ==` `'0') {`

`13`	`var` `startPos = $t.selectionStart;`

`14`	`var` `endPos = $t.selectionEnd;`

`15`	`var` `scrollTop = $t.scrollTop;`

`16`	`$t.value = $t.value.substring(0, startPos) + myValue + $t.value.substring(endPos, $t.value.length);`

`17`	`this.focus();`

`18`	`$t.selectionStart = startPos + myValue.length;`

`19`	`$t.selectionEnd = startPos + myValue.length;`

`20`	`$t.scrollTop = scrollTop;`

21 }

`22`	`else` `{`

`23`	`this.value += myValue;`

`24`	`this.focus();`

25 }

26 }

27 })

`28`	`})(jQuery);`

使用方法:

1

$(selector).insertAtCaret("value");