State Dropdown in Address Field

On the occasion where you want to restrict the State dropdown value to a set list (e.g. US states), below is a slice of code to replace the current text input with a selection list:

Insert the following code into the JavaScript section of your Knack app.

$(document).on('knack-view-render.any', function(event, view, data) {
  const states = [
    "", "AL", "AK", "AZ", "AR", "CA", "CO", "CT", "DE", "FL", "GA", "HI", "ID",
    "IL", "IN", "IA", "KS", "KY", "LA", "ME", "MD", "MA", "MI", "MN", "MS",
    "MO", "MT", "NE", "NV", "NH", "NJ", "NM", "NY", "NC", "ND", "OH", "OK",
    "OR", "PA", "RI", "SC", "SD", "TN", "TX", "UT", "VT", "VA", "WA", "WV",
    "WI", "WY"

  $("input#state.input").each(function () {
    const currentValue = this.value;
    const $stateComboBox = $("<select>", {
      "data-placeholder": "Select",
      "id": "state",
      "name": "state",
      "class": "select",
    $.each(states, function(index, state) {
    const $selectDiv = $("<div>", {
      "class": "kn-select",
  • states will contain an array of all your State selections. If you’re Australian like me, you could replace the array with ["","ACT","NSW","QLD","SA","TAS","VIC","WA"]. I recommend keeping a blank selection at the start of the array.
  • $stateComboBox declares a <select> element with similar id and name to the existing State field
  • $selectDiv declares a <div> that matches properties of a native Knack combo box, so that the styling is maintained

I also highly recommend inserting this slice of code into the CSS section if your Knack app, which will give a little more room for the dropdown arrow:

/* Adjust City and Zip fields to give more room for State when in mobile view */
.kn-input-address .is-grouped>.control:first-child
  flex: 3 !important;

.kn-input-address .is-grouped>.control:last-child
  flex: 1 !important;

The result should look like below:

This solution works in regular and in-line editing forms, is compatible with auto-complete, but will not work in the Builder.
This piece of code can also be adjusted to replace any other text field with a combo box if you want to restrict other values (e.g. title in a name).


@StephenChapman - this is terrific, thanks!

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Nice one @StephenChapman :rocket:

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Seems everyone forgets we also have DC, not a state but we still use it.

I’m Australian, so I barely know your states at all! Haha.
You can adjust the code by adding in "DC", to the existing list.