Flutter – Change TextField’s Underline in Flutter

dartfluttertextfieldunderline

I'm working on an application using Flutter SDK. When I use a TextField widget, and I focus it, the underline becomes blue. I need to change this color to red, how can I do it?

Screenshot of what I need to change. I want just the underline to change, , not the label color.

Screenshot of what I need to change. (I want the underline to change, not the label color)

Best Answer

While these other answers may somehow work, you should definitely not use it. That's not the proper way to get a custom theme in Flutter.

A much more elegant solution is as followed :

final theme = Theme.of(context);

return new Theme(
  data: theme.copyWith(primaryColor: Colors.red),
  child: new TextField(
    decoration: new InputDecoration(
      labelText: "Hello",
      labelStyle: theme.textTheme.caption.copyWith(color: theme.primaryColor),
    ),
  ),
);

At the same time, if you just want to show an error (Red), use errorText of InputDecoration instead. It will automatically set the color to red.

Related Solutions

Javascript – jQuery Set Cursor Position in Text Area

Here's a jQuery solution:

$.fn.selectRange = function(start, end) {
    if(end === undefined) {
        end = start;
    }
    return this.each(function() {
        if('selectionStart' in this) {
            this.selectionStart = start;
            this.selectionEnd = end;
        } else if(this.setSelectionRange) {
            this.setSelectionRange(start, end);
        } else if(this.createTextRange) {
            var range = this.createTextRange();
            range.collapse(true);
            range.moveEnd('character', end);
            range.moveStart('character', start);
            range.select();
        }
    });
};

With this, you can do

$('#elem').selectRange(3,5); // select a range of text
$('#elem').selectRange(3); // set cursor position

Css – Remove blue underline from link

You are not applying text-decoration: none; to an anchor (.boxhead a) but to a span element (.boxhead).

Try this:

.boxhead a {
    color: #FFFFFF;
    text-decoration: none;
}

Best Answer

Related Solutions

Javascript – jQuery Set Cursor Position in Text Area

Css – Remove blue underline from link

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