How to show dropdown expanded automatically so that it displays all the options when page loaded
I have the need to show the DropDown (HTML select element) expanded initiall开发者_开发百科y when it is loaded so that all the options in the DropDown are shown. I searched quite a bit, but suprisingly, I did not find an answer to such a simple problem. I am using ASP.NET MVC with jquery.
Here's a little mashup (that needs tweaking and optimising) but should get you started:
<div style="position:relative">
<select style="position: absolute">
<option>option 1</option>
<option>option 2</option>
<option>option 3</option>
<option>option 4</option>
<option>option 5</option>
</select>
</div>
<script type="text/javascript">
$(document).ready(function() {
$("select").one("focus", function() {
this.size = this.options.length;
}).one("click", function() {
this.size = 1;
}).one("blur", function() {
this.size = this.options.length;
}).focus();
});
</script>
You Could write your HTML like this
<html>
<select id="abc">
<option>option 1</option>
<option>option 2</option>
<option>option 3</option>
<option>option 4</option>
<option>option 5</option>
</select>
</html>
Below, Is the JAVASCRIPT Function that expands automatically.
<script type="text/javascript">
$(document).ready(function() {
var dropdown = document.getElementById("abc");
var event;
event = document.createEvent('MouseEvents');
event.initMouseEvent('mousedown', true, true, window);
dropdown.dispatchEvent(event);
});
</script>
You could write in your HTML code:
<select size="3" name="test" id="test">
<option value="1">one</option>
<option value="2">two</option>
<option value="3">three</option>
</select>
and then via javascript set a timer that after while changes the select box size attribute to 1. For instance at the end of your page (before the clsed body tag) place this code:
<script type="text/javascript">
window.setTimeout(function() { document.getElementById('test').size = 1; }, 5000); //5000 = 5 seconds
</script>
加载中,请稍侯......
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