Python Django: How to prevent form field from clearing?-CodePudding

I am working with Python Django and I have this really simple form, consisting of a button and an input field. The problem is that the input field is for some reason cleared after I submit the form. So How can I prevent it from clearing?

This is my python file:

def index(request):
    # print(f"its me {os.getcwd()}")
    txt = request.GET.get("some_txt")
    if (request.GET.get('mybtn')):
        print(f"THIS IS THE TEXT VALUE: {txt}")
    else:
        print("Has not been clicked")
    return render(request, "main/index.html")

This is the HTML file:

<form action="#" method="get">
        {% csrf_token %}
        <input type="text" name="some_txt">
        <button type="submit"  value="mybtn" name="mybtn">Submit</button>

</form>

CodePudding user response：

You each time render a new form, so if you want to populate the form with the old data, you pass it to the template:

def index(request):
    txt = request.GET.get('some_txt', '')
    if (request.GET.get('mybtn')):
        print(f'THIS IS THE TEXT VALUE: {txt}')
    else:
        print('Has not been clicked')
    return render(request, 'main/index.html', {'txt': txt})

and in the the form, you use that as value:

<form action="" method="get">
    <input type="text" name="some_txt" value="{{ txt }}">
    <button type="submit"  value="mybtn" name="mybtn">Submit</button>
</form>

or with a clear function:

def index(request):
    txt = request.GET.get('some_txt', '')
    if request.GET.get('mybtn') == 'mybtn2':
        txt = ''
    else if request.GET.get('mybtn'):
        print(f'THIS IS THE TEXT VALUE: {txt}')
    else:
        print('Has not been clicked')
    return render(request, 'main/index.html', {'txt': txt})

and at the HTML side we thus work with a second button:

<form action="" method="get">
    <input type="text" name="some_txt" value="{{ txt }}">
    <button type="submit"  value="mybtn" name="mybtn">Submit</button>
    <button type="submit"  value="mybtn2" name="mybtn">Reset</button>
</form>