python 光标位置输入文字_jQuery往textarea中光标所在位置插入文本的方法

$(function() {

/* 在textarea处插入文本--Start */

(function($) {

$.fn.extend({

insertContent : function(myValue, t) {

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

if (document.selection) { // ie

this.focus();

var sel = document.selection.createRange();

sel.text = myValue;

this.focus();

sel.moveStart('character', -l);

var wee = sel.text.length;

if (arguments.length == 2) {

var l = $t.value.length;

sel.moveEnd("character", wee + t);

t <= 0 ? sel.moveStart("character", wee - 2 * t - myValue.length) : sel.moveStart( "character", wee - t - myValue.length);

sel.select();

}

} else if ($t.selectionStart

|| $t.selectionStart == '0') {

var startPos = $t.selectionStart;

var endPos = $t.selectionEnd;

var scrollTop = $t.scrollTop;

$t.value = $t.value.substring(0, startPos)

+ myValue

+ $t.value.substring(endPos,$t.value.length);

this.focus();

$t.selectionStart = startPos + myValue.length;

$t.selectionEnd = startPos + myValue.length;

$t.scrollTop = scrollTop;

if (arguments.length == 2) {

$t.setSelectionRange(startPos - t,

$t.selectionEnd + t);

this.focus();

}

} else {

this.value += myValue;

this.focus();

}

}

})

})(jQuery);

/* 在textarea处插入文本--Ending */

});

$(document).ready(function(){

$("#ch_button").click( function () {

$("#test_in").insertContent("");

});

});

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