01
// 在光標處插入字符串
02
// myField 文本框對象
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// myValue 要插入的值
04
function insertAtCursor(myField, myValue)
05
{
06
//IE support
07
if (document.selection)
08
{
09
myField.focus();
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sel = document.selection.createRange();
11
sel.text = myValue;
12
sel.select();
13
}
14
//MOZILLA/NETSCAPE support
15
else if (myField.selectionStart || myField.selectionStart == '0')
16
{
17
var startPos = myField.selectionStart;
18
var endPos = myField.selectionEnd;
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// save scrollTop before insert
20
var restoreTop = myField.scrollTop;
21
myField.value = myField.value.substring(0, startPos) + myValue + myField.value.substring(endPos, myField.value.length);
22
if (restoreTop > 0)
23
{
24
// restore previous scrollTop
25
myField.scrollTop = restoreTop;
26
}
27
myField.focus();
28
myField.selectionStart = startPos + myValue.length;
29
myField.selectionEnd = startPos + myValue.length;
30
} else {
31
myField.value += myValue;
32
myField.focus();
33
}
34
}
35
36
37
38
function insertText() {
39
var obj = document.getElementById("文本框");
40
var str = "[#$%$#]插入的內容";
41
if (document.selection) {
42
obj.focus();
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var sel = document.selection.createRange();
44
45
sel.text = str;
46
47
} else if (typeof obj.selectionStart === 'number' && typeof obj.selectionEnd === 'number') {
48
var startPos = obj.selectionStart;
49
var endPos = obj.selectionEnd;
50
var tmpStr = obj.value;
51
obj.value = tmpStr.substring(0, startPos) + str + tmpStr.substring(endPos, tmpStr.length);
52
} else {
53
obj.value += str;
54
}
55
}
56
57
58
59
//Jquery光標處插入文本
60
61
$(document).ready(function () {
62
$("#btnInsert").click(function () {
63
var obj = $("#txtquestion").get(0);
64
var str = "[#$%$#]";
65
if (document.selection) {
66
obj.focus();
67
var sel = document.selection.createRange();
68
sel.text = str;
69
} else if (typeof obj.selectionStart === 'number' && typeof obj.selectionEnd === 'number') {
70
var startPos = obj.selectionStart;
71
var endPos = obj.selectionEnd;
72
var tmpStr = obj.value;
73
obj.value = tmpStr.substring(0, startPos) + str + tmpStr.substring(endPos, tmpStr.length);
74
} else {
75
obj.value += str;
76
77
});
78
});
摘自 JSON