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I am using SPO. I have a custom New Item form with a 255 character single line of text field called [Description]

I would like to increase the width of the field input box in the custom New Item form. I belive it is currently at 400px and I would like 2000px

I have tried to adjust the width in SPD by editing the form but it had no impact.

Does anyone have any suggestions, perhaps javascript that works?

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CSS-only. (Inside a script editor webpart on the form aspx page).

The only thing you need to change is the TR child element (tr:nth-child(1)). Now it targets the first column in the form. The first TD is always the label field and the second is the actual textbox.

   <style type="text/css">
    tbody > tr:nth-child(1) > td:nth-child(2) > span > .ms-long {
    width:2000px;
    }
    </style>
  • Hi, thanks for the code above. I pasted it into a Script Editor webpart added to the page but it hasnt had any impact. Is there something else I need to do? – cr1 Mar 16 '17 at 8:13
  • Did you add it to the actual list form? new.aspx? And do you have the new list experience? – Christoffer Mar 16 '17 at 8:15
  • Hi Christoffer, i mustve done something wrong the first time. Repeated the process and now it works. Thank you. – cr1 Mar 16 '17 at 8:19
  • No problem. :) I was thinking that if the modern list experience were enabled, you would have needed different code. – Christoffer Mar 16 '17 at 8:20
  • That is a very very specific path you are declaring with all those > (direct child elements). INPUTs having a class ms-long can be targeted with input.ms-long (note there is no space in between) A Form also has textareas, if you want to include those just do .ms-long – Danny '365CSI' Engelman Mar 16 '17 at 10:17
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Add a content editor webpart to the custom list form and add the below code inside it

$("input[title='Description']").attr("style","width:2000px;");

If your Description field is Required field then just use below code

 $("input[title='Description Required Field']").attr("style","width:2000px;");

Dont forget to add Jquery reference above this code

  • Hi, thanks for your answer. I used the following code but it hasn impacted the field width: <script src="ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js" type="text/javascript"></script> <script> $("input[title='Description']").attr("style","width:2000px;"); </script> – cr1 Mar 16 '17 at 8:06
  • Can you just do inspect element of your browser (press F12) and see what is the title of your text field? – SharePointMan Mar 16 '17 at 9:42

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