[ngx-formly] Implement multi-column layout Forms with Angular Formly

Real forms are rarely visualized as a single column with one field below the other. Rather they often span over multiple columns to save screen space. In this lesson we'll have a look how to implement such a multi-column form with Formly.

Note, future versions of Formly might even include some native constructs for more advanced layouts

function Row(fields: FormlyFieldConfig[]) {
  return {
    fieldGroup: fields,
    fieldGroupClassName: 'display-flex flex-wrap row',
  };
}

function Column(fields: FormlyFieldConfig[]) {
  return {
    fieldGroup: fields,
    fieldGroupClassName: 'display-flex column',
  };
}

.display-flex {
  display: flex;
}

.row {
  flex-direction: row;
}

.column {
  flex-direction: column;
}

.flex-wrap {
  flex-wrap: wrap;
}

@for $i from 1 through 12 {
  .flex-#{$i} {
    flex: $i;
  }
}

[class*='flex-'] {
  padding-left: 10px;
  padding-right: 10px;
}

[class*='flex-']:first-child,
.flex-12 {
  padding-left: 0;
}

[class*='flex-']:last-child {
  padding-right: 0;
}

    Row([
      {
        key: 'firstname',
        type: 'input',
        className: 'flex-1',
        templateOptions: {
          type: 'text',
          label: 'FirstName',
          required: true,
          attributes: {
            'data-cy': 'firstname',
          },
        },
      },
      {
        key: 'age',
        type: 'input',
        className: 'flex-1',
        templateOptions: {
          type: 'number',
          label: 'Age',
          min: 18, // use global min error message
        },
        // override the global min error message
        validation: {
          messages: {
            min: 'Sorry, you have to be older than 18',
          },
        },
      },
    ]),

    Column([
      {
        key: 'ip',
        type: 'input',
        templateOptions: {
          required: true,
          label: 'IP Address',
        },
        validators: {
          // validation: ['ip']
          ip2: {
            expression: c => !c.value || /(d{1,3}.){3}d{1,3}/.test(c.value),
            message: (errorr, field: FormlyFieldConfig) =>
              `"${field.formControl.value}" is not valid`,
          },
        },
      },
    ]),