The jquery plug in implements the automatic height of the multi line text box [textarea]

Implementation functions:

1/ automatically increases the height of a row when textarea wraps
2/ when textarea removes 1 line, it automatically reduces 1 line and is highly dependent: jquery.xxx.js needs to use a similar feature for work but finds it inconvenient to import other files using the plug-in, so it writes 1

textarea jquery plug-in

<div class="form-group">

    <label class="col-sm-3 control-label no-padding-right" for="form-field-5">  content </label>

    <div class="col-sm-9">

        <textarea class="col-sm-8" id="form-field-5" placeholder=" Please enter the content ..."></textarea>

    </div>

</div>

jQuery.extend({

    textareaAutosize_dc: function() {

        $("textarea").on("keyup", function(e) {

            var currentEnterCount = $(this).val().split("\n").length;

            var lineHeight = Number($(this).css("line-height").replace("px", ""));

            var enterCount = $(this).attr("enterCount");

            if (currentEnterCount < enterCount && enterCount != undefined) {

                // Each row is subtracted from the fixed row height 

                $(this).height($(this).height() - lineHeight);

            } else if (currentEnterCount > enterCount) {

                // Add a fixed row height to each row 

                $(this).height($(this).height() + lineHeight);

                $(this).attr("enterCount", currentEnterCount);

            }

            // Records the current row height 

            $(this).attr("enterCount", currentEnterCount);

        });

    }

});

// Call auto height 

$.textareaAutosize_dc();

That's all for this article, I hope you enjoy it.