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selectBoxGwaJe.html
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<html>
<head>
<title>폼 셀렉트</title>
<meta http-equiv="content-type" content="text/html; charset=euc-kr">
<script language="javascript">
function Category(value) {
this.value = value;
this.length = 0;
}
function addCategory(category, value) {
category[category.length] = new Category(value);
category.length++;
}
var category = new Category();
addCategory(category, "==전자기기==");
addCategory(category, "휴대폰");
addCategory(category, "노트북");
addCategory(category, "태블릿");
addCategory(category[1], "==제조사==");
addCategory(category[1], "삼성전자");
addCategory(category[1], "애플");
addCategory(category[1], "LG전자");
addCategory(category[1][1], "==제품명==");
addCategory(category[1][1], "갤럭시S10");
addCategory(category[1][1], "갤럭시 노트9");
addCategory(category[1][1], "갤럭시 폴드");
addCategory(category[1][1], "갤럭시 S8");
addCategory(category[1][2], "==제품명==");
addCategory(category[1][2], "아이폰XS");
addCategory(category[1][2], "아이폰8");
addCategory(category[1][2], "아이폰SE");
addCategory(category[1][2], "아이폰XR");
addCategory(category[1][3], "==제품명==");
addCategory(category[1][3], "G8");
addCategory(category[1][3], "G7");
addCategory(category[1][3], "X4");
addCategory(category[1][3], "V50");
addCategory(category[1][3], "V40");
addCategory(category[2], "==제조사==");
addCategory(category[2], "ASUS");
addCategory(category[2], "레노버");
addCategory(category[2], "MSI");
addCategory(category[2][1], "==제품명==");
addCategory(category[2][1], "FX505");
addCategory(category[2][1], "S15");
addCategory(category[2][1], "X505");
addCategory(category[2][1], "L203");
addCategory(category[2][2], "==제품명==");
addCategory(category[2][2], "LEGION");
addCategory(category[2][2], "아이디어패드");
addCategory(category[2][2], "씽크패드");
addCategory(category[2][2], "YOGA");
addCategory(category[2][3], "==제품명==");
addCategory(category[2][3], "GS");
addCategory(category[2][3], "GP");
addCategory(category[2][3], "프레스티지");
addCategory(category[2][3], "GL");
addCategory(category[3], "==제조사==");
addCategory(category[3], "애플");
addCategory(category[3], "삼성전자");
addCategory(category[3], "레노버");
addCategory(category[3][1], "==제품명==");
addCategory(category[3][1], "6세대");
addCategory(category[3][1], "5세대");
addCategory(category[3][1], "3세대");
addCategory(category[3][1], "2세대");
addCategory(category[3][2], "==제품명==");
addCategory(category[3][2], "A");
addCategory(category[3][2], "S4");
addCategory(category[3][2], "S5e");
addCategory(category[3][2], "S3");
addCategory(category[3][3], "==제품명==");
addCategory(category[3][3], "E10");
addCategory(category[3][3], "M10");
addCategory(category[3][3], "E8");
addCategory(category[3][3], "P10");
addCategory(category[3][3], "P7");
function initForm(form) {
form.subject.length = category.length;
for (i = 0; i < category.length; i++)
form.subject[i].text = category[i].value;
form.subject.selectedIndex = 0;
form.contents.selectedIndex = 0;
}
function change_subject(form) {
var i = form.subject.selectedIndex;
form.contents.length = category[i].length;
for (j = 0; j < form.contents.length; j++)
form.contents[j].text = category[i][j].value;
form.contents.selectedIndex = 0;
change_contents(form);
}
function change_contents(form) {
var i = form.subject.selectedIndex
var j = form.contents.selectedIndex;
form.components.length = category[i][j].length;
for (k = 0; k < form.components.length; k++)
form.components[k].text = category[i][j][k].value;
form.components.selectedIndex = 0;
}
function change_components(form) {
var i = form.subject.selectedIndex
var j = form.contents.selectedIndex;
var k = form.components.selectedIndex;
form.view.length = category[i][j][k].length;
for (l = 0; l < form.view.length; l++)
form.view[l].text = category[i][j][k][l].value;
form.view.selectedIndex = 0;
}
</script>
</head>
<body onLoad="initForm(document.form)">
<h1>3단 동적 셀렉트 박스 예제</h1>
<form name="form" METHOD=POST ACTION="" >
<select name="subject" onChange="change_subject(this.form)"></select>
<select name="contents" onChange="change_contents(this.form)"></select>
<select name="components" onChange="change_components(this.form)"></select>
</form>
<input type=submit value="선택" name=Submit>
</body>
</html>