Change the options array of a select list

user_447738 0
Viewed 69060

Is there a way to change the options array of an html select list using javascript or mootools?

I need to replace the entire options set with a new one. In my ajax response I receive an array filled in with with the new HTML options, so I try to empty the old list and add new values as follows 

$('element').options.length=0;
for (i=0; i<newSet.length; i++)
{
    $('element').options[i]=newSet[i];
}

The above code gives me an uncaught exception on the line inside the loop.

uncaught exception: [Exception... "Unexpected error" nsresult: "0x8000ffff (NS_ERROR_UNEXPECTED)" location: "JS frame

Just to add what worked for me:

/* get new options from json*/
var new_options = response.options;

/* Remove all options from the select list */
$('idresource').empty();
/* Insert the new ones from the array above */
for (var key in new_options)
{
var opt = document.createElement('option');
    opt.text = new_options[key];
    opt.value = key;
    $('idresource').add(opt, null);
}
mootools html javascript
5 Answers

Vanilla JS solution

var arrOptions = [];
arrOptions.push("<option value='' selected>Select from List...</option>");
arrOptions.push("<option value='Trust Deposit'>Trust Deposit</option>");
arrOptions.push("<option value='Operating Deposit'>Operating Deposit</option>");

document.getElementById("selectInput").innerHTML = arrOptions.join();

If you already have a set of options

var arrOptions = [];
var arrOptionsCollection = document.getElementById("check_typeInput").options;
for (var i=0, n = arrOptionsCollection.length; i < n; i++) { // looping over the options
    if (arrOptionsCollection[i].value) {
        arrOptions.push("<option value='" + arrOptionsCollection[i].value + "'>" + arrOptionsCollection[i].text + "</option>");
    }
}
arrOptions.push("<option value='Trust Deposit'>Trust Deposit</option>");
arrOptions.push("<option value='Operating Deposit'>Operating Deposit</option>");

document.getElementById("selectInput").innerHTML = arrOptions.join();
user_37275240
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