How to Select Elements with Periods (.) in Their IDs Using jQuery?

Selecting Elements with a Period in Their ID Using jQuery

When working with HTML forms that contain elements with periods (".") in their IDs, selecting them using jQuery can present a challenge. This is because jQuery uses periods to separate class names from element names.

Understanding the Issue

The following code attempt to select drop-down lists by their IDs using jQuery:

$("#Address.Country")
$("#Address.State")

However, this code doesn't work because jQuery interprets the periods as class names, not part of the ID.

Escaping the Period Character

To escape the period character and select an element by its complete ID, it's necessary to use two backslashes. This is because JavaScript uses one backslash as a special character and jQuery requires an additional backslash to escape the initial backslash.

Corrected Code

The corrected code would look like this:

$("#Address\.Country")
$("#Address\.State")

By escaping the period character with two backslashes, the selectors now correctly match the elements' IDs and allow for manipulation using jQuery.

Example

The following updated jQuery code successfully selects the drop-down lists by their IDs, assuming the forms match the example provided in the original question:

$(function() {
  $.getJSON("/Location/GetCountryList", null, function(data) {
    $("#Address\.Country").fillSelect(data);
  });
  $("#Address\.Country").change(function() {
    $.getJSON("/Location/GetRegionsForCountry", { country: $(this).val() }, function(data) {
      $("#Address\.State").fillSelect(data);
    });
  });
});

By following this method, developers can select elements with periods in their IDs in jQuery, allowing for dynamic manipulation and interaction with the elements on the web page.

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