Automatically increase the height of a text area as you type beyond the maximum width limit

Is there a way to dynamically expand the textarea width as I type beyond its maximum set width without displaying a horizontal scrollbar?

Here is the HTML code in its rendered form:

<textarea name="CatchPhrase" class="input-validation-error" id="CatchPhrase" aria-invalid="true" aria-required="true" aria-describedby="CatchPhrase-error" rows="2" cols="20" data-val-required="The Catch Phrase field is required." data-val="true" data-val-maxlength-max="50"
data-val-maxlength="The field Catch Phrase must be a string or array type with a maximum length of '50'." htmlattributes="{ id = profileCatchPhrase, class = form-control }">I like yoga sd;lasdlk asdks';aksd'asd 'asd';las ';asd'lasd';las'dl as'dla'sdl'asld as'd;las'dl; a;sdlka;sdklasd ;alsd;lkasda ;alskd;lkasd ;lkasd;lk</textarea>

This is how the HTML code looks before it gets rendered:

<div class="form-group">
@Html.LabelFor(model => model.CatchPhrase, htmlAttributes: new { @class = "control-label col-lg-2 col-md-2 col-sm-2 col-xs-2" })
<div class="col-lg-10 col-md-10 col-sm-10 col-xs-10">
@Html.TextAreaFor(model => model.CatchPhrase, new { htmlAttributes = new { id = "profileCatchPhrase", @class = "form-control" } }) @Html.ValidationMessageFor(model => model.CatchPhrase, "", new { @class = "text-danger" })
</div>
</div>

Answer №1

Consider using this solution:

$('#CatchPhrase').on('input', function() {
  $(this).outerHeight(38).outerHeight(this.scrollHeight);
});

Check out more details here:

jsfiddle example:https://jsfiddle.net/3qmztmjj/

Answer №2

If you're looking to expand the horizontal width of a text area based on character count, one approach is to monitor the input using maxlength and incrementally increase the width. Hopefully, this code snippet will provide some assistance.

$("#profileCatchPhrase").keypress(function() {
    if ($(this).val().length > $(this).attr("data-val-maxlength-max")) {
      var width = parseInt($(this).css("width").split("p")[0]) + 10;
      $(this).css("width", width + "px");
      $(this).attr("data-val-maxlength-max", parseInt($(this).attr("data-val-maxlength-max")) + 5);
    }
  });

This code snippet uses a step size of 10px for increasing the width, but feel free to adjust it as needed.

Answer №3

If you're looking to expand a textarea horizontally rather than vertically, you can achieve this with the following code:

<textarea type="text" value="" placeholder="Autosize"></textarea>

Create a simple JavaScript function to handle the horizontal expansion:

$('textarea').keyup(function () {
 // Assuming that each letter typed will increase the width by 10 pixels
 var oneLetterWidth = 10;

 // Input will resize once at least eleven characters are typed
 var minCharacters = 11;
 var len = $(this).val().length;
 if (len > minCharacters) {
     $(this).width(len * oneLetterWidth);
 } else {
     $(this).width(150); // Restore minimal width if less than specified characters
 }
});

To limit the maximum width of the textarea and prevent it from expanding indefinitely, add the following CSS in the head section of your HTML:

 textarea { 
 max-width: 400px;
 }

Answer №4

Implementing jQuery with the specific ID of the textarea in the following manner:

$(function() {
   $('#CatchPhrase').autogrow();
});

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