Javascript to detect whether the dropdown of a select element is visible
11,171
Solution 1
here is how I would preferred to do it. focus and blur is where it is at.
<html>
<head>
<title>SandBox</title>
</head>
<body>
<select id="ddlBox">
<option>Option 1</option>
<option>Option 2</option>
<option>Option 3</option>
</select>
<div id="divMsg">some text or whatever goes here.</div>
</body>
</html>
<script type="text/javascript">
window.onload = function() {
var ddlBox = document.getElementById("ddlBox");
var divMsg = document.getElementById("divMsg");
if (ddlBox && divMsg) {
ddlBox.onfocus = function() {
divMsg.style.display = "none";
}
ddlBox.onblur = function() {
divMsg.style.display = "";
}
divMsg.style.display = "";
}
}
</script>
Solution 2
Conditional-content, which is what you're asking about, isn't that difficult. The in the following example, I'll use jQuery to accomplish our goal:
<select id="theSelectId">
<option value="dogs">Dogs</option>
<option value="birds">Birds</option>
<option value="cats">Cats</option>
<option value="horses">Horses</option>
</select>
<div id="myDiv" style="width:300px;height:100px;background:#cc0000"></div>
We'll tie a couple events to show/hide #myDiv based upon the selected value of #theSelectId
$("#theSelectId").change(function(){
if ($(this).val() != "dogs")
$("#myDiv").fadeOut();
else
$("#myDiv").fadeIn();
});
Author by
Ikoy
Updated on June 30, 2022Comments
-
Ikoy almost 2 years
I have a select element in a form, and I want to display something only if the dropdown is not visible. Things I have tried:
- Watching for click events, where odd clicks mean the dropdown is visible and even clicks mean the dropdown isn't. Misses other ways the dropdown could disappear (pressing escape, tabbing to another window), and I think this could be hard to get right cross-browser.
- Change events, but these only are triggered when the select box's value changes.
Ideas?
-
PetersenDidIt over 14 yearsThis will work correctly for both mouse user and keyboard only users.
-
user3167101 almost 14 yearsYou can make it more succinct with
$element.is(':visible')