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dynamically increase input type text textbox width according to the characters entering into it

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名媛妹妹
名媛妹妹 2020-12-06 21:41

I have a textbox where the user can enter any number of characters, But I want its width to be increased dynamically with respect to the number of chara

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  • 闹比i
    2020-12-06 22:03 
    <input type="text" id="txtbox" size="10"/> 

$('#txtbox').keypress(function() {
        var txtWidth = $(this).attr('size');
        var cs = $(this).val().length-6;
        txtWidth = parseInt(txtWidth);
        if(cs>txtWidth){
           $(this).attr('size',txtWidth+5);    }
    });

    You were using width field which is actually meant for type = image. You can get more info here. I have used size attribute which is used to set the size of input tag in pixels. When its 1 it can take 6 characters by default hence -6. Hope it helps.

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  • 伪装坚强ぢ
    2020-12-06 22:10

    On the x-editable documentation you can find the option type so i guess you have to add data-editable-type="textarea"

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  • 臣服心动
    2020-12-06 22:13

    Adding a simple inline code in onkeyUp should help

    <input type="text" name="fname" onkeypress="this.style.minWidth = ((this.value.length + 1) * 7) + 'px';">

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  • 长情又很酷
    2020-12-06 22:14

    A solution similar to @Tejas', but doesn't require the font to be mono-space:

    The trick is to use scrollWidth, which gives us the total string length, even on single-line textboxes without a scrollbar: https://stackoverflow.com/a/9312727/1869660

    NOTE: I couldn't get this to work in IE, where scrollWidth always returned 2 for some reason..

    Some code:

    function expand(textbox) {
    if (!textbox.startW) { textbox.startW = textbox.offsetWidth; }

    var style = textbox.style;

    //Force complete recalculation of width
    //in case characters are deleted and not added:
    style.width = 0;

    var desiredW = textbox.scrollWidth;
    //Optional padding to reduce "jerkyness" when typing:
    desiredW += textbox.offsetHeight;

    style.width = Math.max(desiredW, textbox.startW) + 'px';
}

...

<input type="text" onkeyup="expand(this);" >

    JSFiddle example

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  • 闹比i
    2020-12-06 22:16

    I have tried this code and it works fine.

    <html>
<head>
  <script type="text/javascript">
     function Expand(obj){
      if (!obj.savesize) obj.savesize=obj.size;
      obj.size=Math.max(obj.savesize,obj.value.length);
     }
  </script>
  </head>
  <body>
     <form>
       <input  type="text" size="5" style="font-family:Courier;" onkeyup="Expand(this);">
     </form>
  </body>
</html>

    Be sure to use mono space fonts in text box, otherwise the size attr. and number of characters won't match

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