display data related to a dropdown option - javascript

I have a drop down list
<select name="column_select" id="column_select">
<option value="col1">1 column</option>
<option value="col2">2 column</option>
<option value="col3">3 column</option>
</select>
On clicking an option i want to display the details of the particular option in the same page.
How can this be implemented using jquery?


function showval(value)
{
var text = $("#column_select option:selected").text();
var string = "Value is: "+value+" and Text is: "+text;
$("#showvalue").html(string);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="showvalue">
</div>
<select name="column_select" id="column_select" onchange="showval(this.value);">
<option value="col1">1 column</option>
<option value="col2">2 column</option>
<option value="col3">3 column</option>
</select>
It should help you.


use this jquery
jquery
$('select.column_select').on('change', function(){
var selectVal = $(this).val();
if(selectVal==col1){
// do something
};
if(selectVal==col2){
// do something
};
if(selectVal==col3){
// do something
};
});


You can subscribe to the change event for the select and perform the details display based on the current value in the select:
$("#column_select").on("change", function () {
var value = $(this).val();
// logic based on selected value
});


try this...
$(document).on('change','#column_select',function() {
// Code to write it anywhere on page.
// If you want it to write on `span#spnDisplay` then use this
var selText = $('#column_select option:selected').text();
$('#spnDisplay').text(selText)
});

Related

How do I set select options using JSON data?

I have an array of select boxes, with a unique id like this.
<select class="taskcompleted" id="c392018">
<option value="No">No</option>
<option value="Yes">Yes</option>
</select>
I have a JSON in the format
{"id":"c392018","value":"Yes"}
I am using the following Javascript to set the selected value
$.getJSON('getstatus.php') //place correct script URL
.done(function(response) {
$.each(response, function(key) {
var SelectObj = response[key];
console.log(SelectObj['value']);
jQuery('#' + SelectObj['id']).val(SelectObj['value']).attr('selected', true);
});
});
This is not selecting the value of "Yes". How can I do this?

You simply need to use .val() to set the selected option using the value from your object:
So where you have:
jQuery('#' + SelectObj['id']).val(SelectObj['value']).attr('selected', true);
Should be:
jQuery('#' + SelectObj['id']).val(SelectObj['value']);
See the snippet example below:
Also if you really want the selected property on the item, you should use:
.prop("selected", "selected");
var SelectObj = {"id":"c392018","value":"Yes"};
jQuery('#' + SelectObj['id']).val(SelectObj['value']).prop('selected','selected');
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select class="taskcompleted" id="c392018">
<option value="No">No</option>
<option value="Yes">Yes</option>
</select>

Well, you don't really need jQuery here.
var select = document.getElementById(SelectObj.id);
select.value = SelectObj.value;

Event listener inside a function

I have a select on my page:
<select id='cat'>
<option value='a'>A</option>
<option value='b'>B</option>
<option value='all'>all</option>
</select>
With a javascript function that handles which options have to be displayed:
function funcName(aList) {
// populates the options for the select tag
$("#cat").on("change", function(){
// some computation;
});
// uses aList to update some div data
}
What I'm trying to do is if the selected option is all, I have to display everything in aList, otherwise based on the selected option I have to display only the related options. Is my usage of onchange event correct?
Initially I thought of making aList global, but after some reading on globals in JS, I got to know it is not a very good practice.
Thanks in advance!
UPDATE: aList contains some string values.

$(function () {
$("#ddl").change(function () {
var selectedText = $(this).find("option:selected").text();
var selectedValue = $(this).val();
var assignedRoleId = new Array();
alert("Selected Text: " + selectedText + " Value: " + selectedValue);
if(selectedValue== "all")
{
$("#ddl option").each(function()
{
if(this.value=="all")
{
assignedRoleId.push();
}
else
{
assignedRoleId.push(this.value);
assignedRoleId.push(" ");
$("#selected").html(assignedRoleId);
}
});
}
});
});
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
Select something:
<select id="ddl">
<option value="">select one</option>
<option value="a">a</option>
<option value="b">b</option>
<option value="all">all</option>
</select>
<div id="selected">
</div>

How to get different selected values in javascript?

Hello everyone how can I get two values from different select boxes? I get first value in my select box but I can't get the second value from another select box.Here is my javascript code:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function () {
var select = document.forms[0].sel;
var select2=document.forms[0].sel2;
select.onchange = function () {
var value = select.options[select.selectedIndex].value; // to get Value
alert(value);
}
select2.onchange = function () {
var value2 = select2.options[select2.selectedIndex].value; // to get Value
alert(value2);
}
});
</script>
<form>
<SELECT NAME="sel" onChange="split(selected value)">
<OPTION VALUE=1>Milk</option>
<OPTION VALUE=2>tea</option>
<OPTION VALUE=3>water</option>
<OPTION VALUE=4>coffee</option>
</SELECT>
</form>
<form>
<SELECT NAME="sel2" onChange="split(selected value)">
<OPTION VALUE=1>Milk</option>
<OPTION VALUE=2>tea</option>
<OPTION VALUE=3>water</option>
<OPTION VALUE=4>coffee</option>
</SELECT>
</form>

The second select box is in the second form. So:
var select2 = document.forms[1].sel2;
That said, you can actually use jQuery for these things:
// bind a change event handler to the second select
$("select").eq(1).on("change", function() {
alert( $(this).val() );
});

jQuery Tip - Getting Select List Values
var foo = [];
$('#multiple :selected').each(function(i, selected){
foo[i] = $(selected).text();
});

$(document).ready(function () {
$('#sel').change(function(){ $('#sel option:selected').val(); });
give id to your select control
<SELECT id="sel">

with help of jQuery ( i suggest the logic, not the solution )
$(document).on('change', 'select', function(){
var selecetdOption = $(this).val();
alert(selecetdOption );
});​
Working Demo

You have wrong into your javascript because you have put
var select2=document.forms[0].sel2;
try to put
var select2=document.forms[1].sel2;
and it works!

Why isn't drop down changing based on other value?

I'm not sure why this isn't working. Anyone care to take a stab?
I have a form with the below. When the user selects the "disabled" option in #frmcomments, I'd like #frmstatus to change to the option value of private.
<label for="type">Comments:</label>
<select class="sort-select" id="frmcomments" name="frmcomments">
<option value="enabled">Allow Comments</option>
<option value="disabled">No Comments</option>
</select>
<label for="type">Status:</label>
<select class="sort-select" id="frmstatus" name="frmstatus">
<option value="public">Anyone can see</option>
<option value="private">Only I can see</option>
</select>
I'm using the following jquery, but it's failing?
$('#frmcomments').change(function() {
var thistype = $(this).find(":selected").val();
if(thistype=="disabled") {
$("#frmstatus").val("private");
}
return false;
});

Check your thistype value. You should be able to call val() on the select and you shouldn't have to call .find(":selected") to get the selected list item.

$('#frmcomments').change(function() {
var thistype = $(this).val();
if(thistype=="disabled") {
$("#frmstatus").val("private").change();
}
return false;
});

var thistype = $(this).find(":selected").val();
try this
var thistype = $(this).val();

Changing the selected option of an HTML Select element

In my HTML, I have a <select> with three <option> elements. I want to use jQuery to check each option's value against a Javascript var. If one matches, I want to set the selected attribute of that option. How would I do that?

Vanilla JavaScript
Using plain old JavaScript:
var val = "Fish";
var sel = document.getElementById('sel');
document.getElementById('btn').onclick = function() {
var opts = sel.options;
for (var opt, j = 0; opt = opts[j]; j++) {
if (opt.value == val) {
sel.selectedIndex = j;
break;
}
}
}
<select id="sel">
<option>Cat</option>
<option>Dog</option>
<option>Fish</option>
</select>
<button id="btn">Select Fish</button>
jQuery
But if you really want to use jQuery:
var val = 'Fish';
$('#btn').on('click', function() {
$('#sel').val(val);
});
var val = 'Fish';
$('#btn').on('click', function() {
$('#sel').val(val);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<select id="sel">
<option>Cat</option>
<option>Dog</option>
<option>Fish</option>
</select>
<button id="btn">Select Fish</button>
jQuery - Using Value Attributes
In case your options have value attributes which differ from their text content and you want to select via text content:
<select id="sel">
<option value="1">Cat</option>
<option value="2">Dog</option>
<option value="3">Fish</option>
</select>
<script>
var val = 'Fish';
$('#sel option:contains(' + val + ')').prop({selected: true});
</script>
Demo
But if you do have the above set up and want to select by value using jQuery, you can do as before:
var val = 3;
$('#sel').val(val);
Modern DOM
For the browsers that support document.querySelector and the HTMLOptionElement::selected property, this is a more succinct way of accomplishing this task:
var val = 3;
document.querySelector('#sel [value="' + val + '"]').selected = true;
Demo
Knockout.js
<select data-bind="value: val">
<option value="1">Cat</option>
<option value="2">Dog</option>
<option value="3">Fish</option>
</select>
<script>
var viewModel = {
val: ko.observable()
};
ko.applyBindings(viewModel);
viewModel.val(3);
</script>
Demo
Polymer
<template id="template" is="dom-bind">
<select value="{{ val }}">
<option value="1">Cat</option>
<option value="2">Dog</option>
<option value="3">Fish</option>
</select>
</template>
<script>
template.val = 3;
</script>
Demo
Angular 2
Note: this has not been updated for the final stable release.
<app id="app">
<select [value]="val">
<option value="1">Cat</option>
<option value="2">Dog</option>
<option value="3">Fish</option>
</select>
</app>
<script>
var App = ng.Component({selector: 'app'})
.View({template: app.innerHTML})
.Class({constructor: function() {}});
ng.bootstrap(App).then(function(app) {
app._hostComponent.instance.val = 3;
});
</script>
Demo
Vue 2
<div id="app">
<select v-model="val">
<option value="1">Cat</option>
<option value="2">Dog</option>
<option value="3">Fish</option>
</select>
</div>
<script>
var app = new Vue({
el: '#app',
data: {
val: null,
},
mounted: function() {
this.val = 3;
}
});
</script>
Demo

None of the examples using jquery in here are actually correct as they will leave the select displaying the first entry even though value has been changed.
The right way to select Alaska and have the select show the right item as selected using:
<select id="state">
<option value="AL">Alabama</option>
<option value="AK">Alaska</option>
<option value="AZ">Arizona</option>
</select>
With jquery would be:
$('#state').val('AK').change();

You can change the value of the select element, which changes the selected option to the one with that value, using JavaScript:
document.getElementById('sel').value = 'bike';​​​​​​​​​​
DEMO

Markup
<select id="my_select">
<option value="1">First</option>
<option value="2">Second</option>
<option value="3">Third</option>
</select>
jQuery
var my_value = 2;
$('#my_select option').each(function(){
var $this = $(this); // cache this jQuery object to avoid overhead
if ($this.val() == my_value) { // if this option's value is equal to our value
$this.prop('selected', true); // select this option
return false; // break the loop, no need to look further
}
});
Demo

I want to change the select element's selected option's both value & textContent (what we see) to 'Mango'.
Simplest code that worked is below:
var newValue1 = 'Mango'
var selectElement = document.getElementById('myselectid');
selectElement.options[selectElement.selectedIndex].value = newValue1;
selectElement.options[selectElement.selectedIndex].textContent = newValue1;
Hope that helps someone. Best of luck.
Up vote if this helped you.

I used almost all of the answers posted here but not comfortable with that so i dig one step furter and found easy solution that fits my need and feel worth sharing with you guys.
Instead of iteration all over the options or using JQuery you can do using core JS in simple steps:
Example
<select id="org_list">
<option value="23">IBM</option>
<option value="33">DELL</option>
<option value="25">SONY</option>
<option value="29">HP</option>
</select>
So you must know the value of the option to select.
function selectOrganization(id){
org_list=document.getElementById('org_list');
org_list.selectedIndex=org_list.querySelector('option[value="'+id+'"]').index;
}
How to Use?
selectOrganization(25); //this will select SONY from option List
Your comments are welcome. :) AzmatHunzai.

Test this Demo
Selecting Option based on its value
var vals = [2,'c'];
$('option').each(function(){
var $t = $(this);
for (var n=vals.length; n--; )
if ($t.val() == vals[n]){
$t.prop('selected', true);
return;
}
});
Selecting Option based on its text
var vals = ['Two','CCC']; // what we're looking for is different
$('option').each(function(){
var $t = $(this);
for (var n=vals.length; n--; )
if ($t.text() == vals[n]){ // method used is different
$t.prop('selected', true);
return;
}
});
Supporting HTML
<select>
<option value=""></option>
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
</select>
<select>
<option value=""></option>
<option value="a">AAA</option>
<option value="b">BBB</option>
<option value="c">CCC</option>
</select>

Excellent answers - here's the D3 version for anyone looking:
<select id="sel">
<option>Cat</option>
<option>Dog</option>
<option>Fish</option>
</select>
<script>
d3.select('#sel').property('value', 'Fish');
</script>

After a lot of searching I tried #kzh on select list where I only know option inner text not value attribute,
this code based on select answer I used it to change select option according to current page urlon this format
http://www.example.com/index.php?u=Steve
<select id="sel">
<option>Joe</option>
<option>Steve</option>
<option>Jack</option>
</select>
<script>
var val = window.location.href.split('u=')[1]; // to filter ?u= query
var sel = document.getElementById('sel');
var opts = sel.options;
for(var opt, j = 0; opt = opts[j]; j++) {
// search are based on text inside option Attr
if(opt.text == val) {
sel.selectedIndex = j;
break;
}
}
</script>
This will keeps url parameters shown as selected to make it more user friendly and the visitor knows what page or profile he is currently viewing .

You just write the code
var theVal = 1;
$('#variable_id').val(theVal).trigger('change');

I used this after updating a register and changed the state of request via ajax, then I do a query with the new state in the same script and put it in the select tag element new state to update the view.
var objSel = document.getElementById("selectObj");
objSel.selectedIndex = elementSelected;
I hope this is useful.

selectElement is a html <select> element.
Increment the value:
selectElement.selectedIndex++
Decrement the value:
selectElement.selectedIndex--

var accHos = document.getElementById("accHos");
function showName(obj) {
accHos.selectedIndex = obj.selectedIndex;
}
div {
color: coral;
}
select {
margin-left: 20px;
margin-bottom: 8px;
min-width: 120px;
}
<div>Select Account Number:</div>
<select id="accNos" name="" onchange="showName(this);">
<option value="">Select Account</option>
<option value="">1052021</option>
<option value="">2052021</option>
<option value="">3052021</option>
<option value="">4052021</option>
<option value="">5052021</option>
</select>
<div>Account Holder Name:</div>
<select id="accHos" name="" disabled>
<option value="">--Name--</option>
<option value="">Suhan</option>
<option value="">Cesur</option>
<option value="">Hopper</option>
<option value="">Rachel</option>
<option value="">Arya</option>
</select>
<!-- Just for my referece -->

Slightly neater Vanilla.JS version. Assuming you've already fixed nodeList missing .forEach():
NodeList.prototype.forEach = Array.prototype.forEach
Just:
var requiredValue = 'i-50332a31',
selectBox = document.querySelector('select')
selectBox.childNodes.forEach(function(element, index){
if ( element.value === requiredValue ) {
selectBox.selectedIndex = index
}
})

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