javascript - seleccion - Cómo abrir la lista de opciones de etiqueta de selección HTML en onfocus()
select html php (6)
Mi código HTML se ve a continuación.
<select id = "demo2">
<option value = "---select---">---select---</option>
<option value = "1">Oranges</option>
<option value = "2">Apples</option>
<option value = "3">Pears</option>
<option value = "4">Kiwis</option>
<option value = "5">Bananas</option>
<option value = "6">Banansasas</option>
<option value = "7">Grapes</option>
</select>
¿Cómo abro la lista de opciones de la etiqueta de select en eventos onfocus() ?
Aquí están las 2 funciones de javascript
function expand(obj)
{
obj.size = 5;
}
function unexpand(obj)
{
obj.size = 1;
}
entonces creo el cuadro de selección
<select id="test" multiple="multiple" name="foo" onFocus="expand(this)" onBlur="unexpand(this)">
<option >option1</option>
<option >option2</option>
<option >option3</option>
<option >option4</option>
<option >option5</option>
</select>
en su código puede colocar este código seleccione id = "demo2" con este código seleccione id = "demo2" onfocus = "myFunction (this) para resaltar su opción.
HTML
<select id = "demo2">
<option disabled="true" selected="true" value = "---select---">---select---</option>
<option value = "1">Oranges</option>
<option value = "2">Apples</option>
<option value = "3">Pears</option>
<option value = "4">Kiwis</option>
<option value = "5">Bananas</option>
<option value = "6">Banansasas</option>
<option value = "7">Grapes</option>
</select>
jQuery
$(''#demo2'').on(''focus'',function() {
var optCount = $(this).children(''options'').length;
$(this).attr(''size'', optCount);
});
Complete el código para el requisito como esta pregunta. Para fines de referencia.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Auto-expand SELECT</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function(){
$(document).ready(function () {
$(''select'').focus(function () {
$(this).attr("size", $(this).attr("expandto"));
});
$(''select'').blur(function () {
$(this).attr("size", 1);
});
$(''select option'').click(function () {
$(this).parent().attr("size", 1);
$(this).parent().val(this.value);
});
$(''select'').live(''keypress'', function (e) {
var key = e.which;
if (key == 13) // the enter key code
{
$(this).attr("size", 1);
}
});
});
</script>
<style type="text/css">
select{position:absolute}
.selectHolder{position:relative; height:45px}
h4{margin:10px 0;}
h5{margin:50px 0 0 0; text-align:center; font-weight:normal }
</style>
</head>
<body>
<div style="margin:30px auto; width:400px; border:1px #888 solid; padding:20px; background-color:#F8F4F0">
<h3 style="text-align:center">Tab In, To Open Select Box</h3><br/><br/>
<form>
<input style="width:230px" type="text" name="start" value="Start here then tab to next input" tabindex="1" /><br/><br/>
<h4>One to Seven</h4>
<div class="selectHolder">
<select class="select" size="1" expandto="7" tabindex="2">
<option value="1" selected="selected">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
<option value="4">Four</option>
<option value="5">Five</option>
<option value="6">Six</option>
<option value="7">Seven</option>
</select>
</div>
<h4>One to Ten</h4>
<div class="selectHolder" >
<select class="select" size="1" expandto="10" tabindex="3">
<option value="1" selected="selected">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
<option value="4">Four</option>
<option value="5">Five</option>
<option value="6">Six</option>
<option value="7">Seven</option>
<option value="8">Eight</option>
<option value="9">Nine</option>
<option value="10">Ten</option>
</select>
</div>
<h4>One to Four</h4>
<div class="selectHolder tab4">
<select class="select" size="1" expandto="4" tabindex="4">
<option value="1" selected="selected">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
<option value="4">Four</option>
</select>
</div>
<h4>One to Dog</h4>
<div class="selectHolder tab4">
<select class="select" size="1" expandto="5" tabindex="5">
<option value="1" selected="selected">One</option>
<option value="2">BAT</option>
<option value="3">BIRD</option>
<option value="4">CAT</option>
<option value="5">DOG</option>
</select>
</div>
</form>
</div>
</body>
</html>
$(document).ready(function(){
$(''select'').focus(function(){
$(this).attr("size",$(this).attr("expandto"));
var x = "select[tabindex=''" + (parseInt($(this).attr(''tabindex''),10) + 1) + "'']";
$(x).fadeTo(50,0);
});
$(''select'').blur(function(){
$(this).attr("size",1);
var x = "select[tabindex=''" + (parseInt($(this).attr(''tabindex''),10) + 1) + "'']";
$(x).fadeTo(''fast'',1.0);
});
});
$(document).ready(function(e) {
$(''#selectBox'').focus(function() {
$(this).attr(''size'',4);
$(this).css(''position'',"absolute");
$(this).css(''x-index'',"1000");
});
$(''#selectBox'').blur(function() {
$(this).attr(''size'',1);
$(this).css(''position'',"relative");
$(this).css(''x-index'',"0");
});
$(''#selectBox2'').focus(function() {
$(this).attr(''size'',4);
$(this).css(''position'',"absolute");
$(this).css(''x-index'',"1000");
});
$(''#selectBox2'').blur(function() {
$(this).attr(''size'',1);
$(this).css(''position'',"relative");
$(this).css(''x-index'',"0");
});
});
<div class="container" style="border:1px solid #00C;">
<div class="row">
<input type="text" placeholder="name" />
<input type="text" placeholder="add" />
<input type="text" placeholder="city" id="city" />
<input type="text" placeholder="tel" />
<input type="text" placeholder="home" />
<input type="text" placeholder="cun" id="cun" />
<br />
<select id="selectBox">
<option value="1" >1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<br />
<br />
<br />
<select id="selectBox2">
<option value="1" >1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
</div>
</div>