I have a <select>
element with the multiple
attribute. How can I get this element's selected values using JavaScript?
Here's what I'm trying:
function loopSelected() {
var txtSelectedValuesObj = document.getElementById('txtSelectedValues');
var selectedArray = new Array();
var selObj = document.getElementById('slct');
var i;
var count = 0;
for (i=0; i<selObj.options.length; i++) {
if (selObj.options[i].selected) {
selectedArray[count] = selObj.options[i].value;
count++;
}
}
txtSelectedValuesObj.value = selectedArray;
}
This question is related to
javascript
html
drop-down-menu
Check this:
HTML:
<select id="test" multiple>
<option value="red" selected>Red</option>
<option value="rock" selected>Rock</option>
<option value="sun">Sun</option>
</select>
Javascript one line code
Array.from(document.getElementById("test").options).filter(option => option.selected).map(option => option.value);
ES6
[...select.options].filter(option => option.selected).map(option => option.value)
Where select
is a reference to the <select>
element.
To break it down:
[...select.options]
takes the Array-like list of options and destructures it so that we can use Array.prototype methods on it (Edit: also consider using Array.from()
)filter(...)
reduces the options to only the ones that are selectedmap(...)
converts the raw <option>
elements into their respective valuesCheck-it Out:
HTML:
<a id="aSelect" href="#">Select</a>
<br />
<asp:ListBox ID="lstSelect" runat="server" SelectionMode="Multiple" Width="100px">
<asp:ListItem Text="Raj" Value="1"></asp:ListItem>
<asp:ListItem Text="Karan" Value="2"></asp:ListItem>
<asp:ListItem Text="Riya" Value="3"></asp:ListItem>
<asp:ListItem Text="Aman" Value="4"></asp:ListItem>
<asp:ListItem Text="Tom" Value="5"></asp:ListItem>
</asp:ListBox>
JQUERY:
$("#aSelect").click(function(){
var selectedValues = [];
$("#lstSelect :selected").each(function(){
selectedValues.push($(this).val());
});
alert(selectedValues);
return false;
});
Same as the earlier answer but using underscore.js.
function getSelectValues(select) {
return _.map(_.filter(select.options, function(opt) {
return opt.selected; }), function(opt) {
return opt.value || opt.text; });
}
You can use [].reduce
for a more compact implementation of RobG's approach:
var getSelectedValues = function(selectElement) {
return [].reduce.call(selectElement.options, function(result, option) {
if (option.selected) result.push(option.value);
return result;
}, []);
};
Pretty much the same as already suggested but a bit different. About as much code as jQuery in Vanilla JS:
selected = Array.prototype.filter.apply(
select.options, [
function(o) {
return o.selected;
}
]
);
It seems to be faster than a loop in IE, FF and Safari. I find it interesting that it's slower in Chrome and Opera.
Another approach would be using selectors:
selected = Array.prototype.map.apply(
select.querySelectorAll('option[selected="selected"]'),
[function (o) { return o.value; }]
);
Here is an ES6 implementation:
value = Array(...el.options).reduce((acc, option) => {
if (option.selected === true) {
acc.push(option.value);
}
return acc;
}, []);
Building on Rick Viscomi's answer, try using the HTML Select Element's selectedOptions property:
let txtSelectedValuesObj = document.getElementById('txtSelectedValues');
[...txtSelectedValuesObj.selectedOptions].map(option => option.value);
In detail,
selectedOptions
returns a list of selected items....
is spread syntax. It expands the HTMLCollection
's elements.[...]
creates a mutable Array
object from these elements, giving you an array of HTMLOptionElements
.map()
replaces each HTMLObjectElement
in the array (here called option
) with its value (option.value
).Dense, but it seems to work.
Watch out, selectedOptions
isn't supported by IE!
Riot js code
this.GetOpt=()=>{
let opt=this.refs.ni;
this.logger.debug("Options length "+opt.options.length);
for(let i=0;i<=opt.options.length;i++)
{
if(opt.options[i].selected==true)
this.logger.debug(opt.options[i].value);
}
};
//**ni** is a name of HTML select option element as follows
//**HTML code**
<select multiple ref="ni">
<option value="">---Select---</option>
<option value="Option1 ">Gaming</option>
<option value="Option2">Photoshoot</option>
</select>
You Can try this script
<!DOCTYPE html>
<html>
<script>
function getMultipleSelectedValue()
{
var x=document.getElementById("alpha");
for (var i = 0; i < x.options.length; i++) {
if(x.options[i].selected ==true){
alert(x.options[i].value);
}
}
}
</script>
</head>
<body>
<select multiple="multiple" id="alpha">
<option value="a">A</option>
<option value="b">B</option>
<option value="c">C</option>
<option value="d">D</option>
</select>
<input type="button" value="Submit" onclick="getMultipleSelectedValue()"/>
</body>
</html>
suppose the multiSelect is the Multiple-Select-Element, just use its selectedOptions Property:
//show all selected options in the console:
for ( var i = 0; i < multiSelect.selectedOptions.length; i++) {
console.log( multiSelect.selectedOptions[i].value);
}
My template helper looks like this:
'submit #update': function(event) {
event.preventDefault();
var obj_opts = event.target.tags.selectedOptions; //returns HTMLCollection
var array_opts = Object.values(obj_opts); //convert to array
var stray = array_opts.map((o)=> o.text ); //to filter your bits: text, value or selected
//do stuff
}
Here ya go.
const arr = Array.from(el.features.selectedOptions) //get array from selectedOptions property
const list = []
arr.forEach(item => list.push(item.value)) //push each item to empty array
console.log(list)
You may use jquery plugin chosen .
<head>
<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/chosen/1.4.2/chosen.min.css"
<script src="//code.jquery.com/jquery-1.11.3.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/chosen/1.4.2/chosen.jquery.min.js"></script>
<script>
jQuery(document).ready(function(){
jQuery(".chosen").data("placeholder","Select Frameworks...").chosen();
});
</script>
</head>
<body>
<label for="Test" class="col-md-3 control label">Test</label>
<select class="chosen" style="width:350px" multiple="true">
<option>Choose...</option>
<option>Java</option>
<option>C++</option>
<option>Python</option>
</select>
</body>
Source: Stackoverflow.com