What is the best way to use jQuery to attach functions to every input element?

Imagine you have a set of HTML markup and CSS like this:

#CSS

.inputhelp_text { background: #000; color: #fff; }
.nodisplay { display: none; }

<input class="inputhelp" id="firstname" /><span class="inputhelp_text nodisplay" id="help_firstname">Write in your firstname</span>

<input class="inputhelp" id="lastname" /><span class="inputhelp_text nodisplay" id="help_lastname">Write in your lastname</span>

If you're using jQuery, you want to bind a function to all input fields (potentially using jQuery's EACH function) so that when you click an input field, it should switch the class of each span to only "inputhelp_text". While you may have achieved this with separate functions for each field, with numerous fields, there must be a more efficient solution.

Any ideas on how to achieve this?

jqueryhtmlcssfunctioneach

Answer №1

If you want to attach functions to the blur() and focus() events, here's a code snippet for you:

$(".inputhelp").focus(function() {
  $("span.inputhelp_text:visible").addClass("nodisplay");
  $(this).next("span.inputhelp_text").removeClass("nodisplay");
}).blur(function() {
  $("span.inputhelp_text").addClass("nodisplay");
});

While jQuery effects like hide() and show() are usually recommended, they may not work well with inline elements like <span>.

Answer №2

Utilize the power of the each method:

$("input").each(function() {
  // Refers to the input DOM element
  // $(this) represents the jQuery wrapped element
});

As an illustration, you may have:

$(this).removeClass("inputhelp");
$(this).addClass("inputhelp_text");

within the function.

Answer №3

In this scenario, my approach is as follows. Imagine you have a group of $("input") elements that you need to interact with in a specific way, such as applying a class of .invalid when they are empty:

$("input").each(function () {
      var $this = $(this);
      $this.focus(function (e) {
        $this.removeClass("invalid");
      });

      $this.blur(function (e) {
        if ($this.val() == "") {
          $this.addClass("invalid");
        }
      });
    });

By saving the reference to $(this) obtained from $.fn.each, you can easily attach event handlers to each element independently.

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