Adding options to select with javascript
JavascriptHtmlJavascript Problem Overview
I want this javascript to create options from 12 to 100 in a select with id="mainSelect", because I do not want to create all of the option tags manually. Can you give me some pointers? Thanks
function selectOptionCreate() {
var age = 88;
line = "";
for (var i = 0; i < 90; i++) {
line += "<option>";
line += age + i;
line += "</option>";
}
return line;
}
Javascript Solutions
Solution 1 - Javascript
You could achieve this with a simple for
loop:
var min = 12,
max = 100,
select = document.getElementById('selectElementId');
for (var i = min; i<=max; i++){
var opt = document.createElement('option');
opt.value = i;
opt.innerHTML = i;
select.appendChild(opt);
}
JS Perf comparison of both mine and Sime Vidas' answer, run because I thought his looked a little more understandable/intuitive than mine and I wondered how that would translate into implementation. According to Chromium 14/Ubuntu 11.04 mine is somewhat faster, other browsers/platforms are likely to have differing results though.
Edited in response to comment from OP:
> [How] do [I] apply this to more than one element?
function populateSelect(target, min, max){
if (!target){
return false;
}
else {
var min = min || 0,
max = max || min + 100;
select = document.getElementById(target);
for (var i = min; i<=max; i++){
var opt = document.createElement('option');
opt.value = i;
opt.innerHTML = i;
select.appendChild(opt);
}
}
}
// calling the function with all three values:
populateSelect('selectElementId',12,100);
// calling the function with only the 'id' ('min' and 'max' are set to defaults):
populateSelect('anotherSelect');
// calling the function with the 'id' and the 'min' (the 'max' is set to default):
populateSelect('moreSelects', 50);
And, finally (after quite a delay...), an approach extending the prototype of the HTMLSelectElement
in order to chain the populate()
function, as a method, to the DOM node:
HTMLSelectElement.prototype.populate = function (opts) {
var settings = {};
settings.min = 0;
settings.max = settings.min + 100;
for (var userOpt in opts) {
if (opts.hasOwnProperty(userOpt)) {
settings[userOpt] = opts[userOpt];
}
}
for (var i = settings.min; i <= settings.max; i++) {
this.appendChild(new Option(i, i));
}
};
document.getElementById('selectElementId').populate({
'min': 12,
'max': 40
});
References:
Solution 2 - Javascript
The most concise and intuitive way would be:
var selectElement = document.getElementById('ageselect');
for (var age = 12; age <= 100; age++) {
selectElement.add(new Option(age));
}
Your age: <select id="ageselect"><option value="">Please select</option></select>
You can also differentiate the name and the value or add items at the start of the list with additional parameters to the used functions:
HTMLSelectElement.add(item[, before]);
new Option(text, value, defaultSelected, selected);
Solution 3 - Javascript
Here you go:
for ( i = 12; i <= 100; i += 1 ) {
option = document.createElement( 'option' );
option.value = option.text = i;
select.add( option );
}
Live demo: http://jsfiddle.net/mwPb5/
Update: Since you want to reuse this code, here's the function for it:
function initDropdownList( id, min, max ) {
var select, i, option;
select = document.getElementById( id );
for ( i = min; i <= max; i += 1 ) {
option = document.createElement( 'option' );
option.value = option.text = i;
select.add( option );
}
}
Usage:
initDropdownList( 'mainSelect', 12, 100 );
Live demo: http://jsfiddle.net/mwPb5/1/
Solution 4 - Javascript
I don't recommend doing DOM manipulations inside a loop -- that can get expensive in large datasets. Instead, I would do something like this:
var elMainSelect = document.getElementById('mainSelect');
function selectOptionsCreate() {
var frag = document.createDocumentFragment(),
elOption;
for (var i=12; i<101; ++i) {
elOption = frag.appendChild(document.createElement('option'));
elOption.text = i;
}
elMainSelect.appendChild(frag);
}
You can read more about DocumentFragment on MDN, but here's the gist of it:
> It is used as a light-weight version of Document to store a segment of > a document structure comprised of nodes just like a standard document. > The key difference is that because the document fragment isn't part of > the actual DOM's structure, changes made to the fragment don't affect > the document, cause reflow, or incur any performance impact that can > occur when changes are made.
Solution 5 - Javascript
The one thing I'd avoid is doing DOM operations in a loop to avoid repeated re-renderings of the page.
var firstSelect = document.getElementById('first select elements id'),
secondSelect = document.getElementById('second select elements id'),
optionsHTML = [],
i = 12;
for (; i < 100; i += 1) {
optionsHTML.push("<option value=\"Age" + i + "\">Age" + i + "</option>";
}
firstSelect.innerHTML = optionsHTML.join('\n');
secondSelect.innerHTML = optionsHTML.join('\n');
Edit: removed the function to show how you can just assign the html you've built up to another select element - thus avoiding the unnecessary looping by repeating the function call.
Solution 6 - Javascript
$('#mySelect')
.append($('<option>', { value : key })
.text(value));
Solution 7 - Javascript
When you create a new Option
object, there are two parameters to pass: The first is the text you want to
appear in the list, and the second the value to be assigned to the option.
var myNewOption = new Option("TheText", "TheValue");
You then simply assign this Option
object to an empty array element, for example:
document.theForm.theSelectObject.options[0] = myNewOption;
Solution 8 - Javascript
None of the above solutions worked for me. Append method didn't give error when i tried but it didn't solve my problem. In the end i solved my problem with data property of select2. I used json and got the array and then give it in select2 element initialize. For more detail you can see my answer at below post.
Solution 9 - Javascript
Often you have an array of related records, I find it easy and fairly declarative to fill select
this way:
selectEl.innerHTML = array.map(c => '<option value="'+c.id+'">'+c.name+'</option>').join('');
This will replace existing options.
You can use selectEl.insertAdjacentHTML('afterbegin', str);
to add them to the top instead.
And selectEl.insertAdjacentHTML('beforeend', str);
to add them to the bottom of the list.
IE11 compatible syntax:
array.map(function (c) { return '<option value="'+c.id+'">'+c.name+'</option>'; }).join('');