<p>How can I change the width of a textarea form element if I used ModelForm to create it?</p>

<p>Here is my product class:</p>

<pre><code>class ProductForm(ModelForm):
    long_desc = forms.CharField(widget=forms.Textarea)
    short_desc = forms.CharField(widget=forms.Textarea)
    class Meta:
        model = Product
</code></pre>

<p>And the template code...</p>

<pre><code>{% for f in form %}
    {{ f.name }}:{{ f }}
{% endfor %}
</code></pre>

<p><code>f</code> is the actual form element...</p>

The easiest way for your use case is to use CSS
. It's a language meant for defining presentation. Look at the code generated by form, take note of the ids for fields that interest you, and change appearance of these fields through CSS.
Example for
```
long_desc
```
field in your ProductForm (when your form does not have a custom prefix):
```
```
#id_long_desc {
    width: 300px;
    height: 200px;
}
```
```
Second approach
is to pass the
```
attrs
```
keyword to your widget constructor.
```
```
class ProductForm(ModelForm):
    long_desc = forms.CharField(widget=forms.Textarea(attrs={'cols': 10, 'rows': 20}))
    short_desc = forms.CharField(widget=forms.Textarea)
    class Meta:
        model = Product
```
```
It's
described in Django documentation
.
Third approach
is to leave the nice declarative interface of newforms for a while and set your widget attributes in custom constructor.
```
```
class ProductForm(ModelForm):
    long_desc = forms.CharField(widget=forms.Textarea)
    short_desc = forms.CharField(widget=forms.Textarea)
    class Meta:
        model = Product

    # Edit by bryan
    def __init__(self, *args, **kwargs):
        super(ProductForm, self).__init__(*args, **kwargs) # Call to ModelForm constructor
        self.fields['long_desc'].widget.attrs['cols'] = 10
        self.fields['long_desc'].widget.attrs['rows'] = 20
```
```
This approach has the following advantages:
You can define widget attributes for fields that are generated automatically from your model without redefining whole fields.
It doesn't depend on the prefix of your form.