Troubleshooting issue: Django and Javascript - Why is my dependent dropdown feature not

I am new to using a combination of Javascript and Django.

Below is the script I have written:

<script>
        $(document).ready(function() {
            $("#source").change(function() {
                var el = $(this);

                var reg = [];
                var name = [];

                {% for item in city %}
                    reg.push({{ item.reg }});
                    name.push({{ item.name }});
                {% endfor %}

                var a = getElementById("status").length;

                for(val i = 0; i<a; i++){
                    if(el.val() == reg[i]){
                        $("#status").append("<option id = "+ reg[i] +">" + name[i] + "</option>");
                    }

                }
            });
        });
    </script>

This is my form structure:

<form method = "POST">
        {% csrf_token %}
        <select id="source" name="source">
            <option>-----</option>
            {% for item in region %}
                <option id = {{ item.id }}>{{ item.name }}</option>
            {% endfor %}
        </select>

        <select id="status" name="status">
            <option>-----</option>
        </select>

        <select id="3">
            <option>-----</option>
            {% for item in zip %}
                <option id = {{ item.cit }}>{{ item.num }}</option>
            {% endfor %}
        </select>
    </form>

My goal is to populate the second dropdown menu based on the selection made in the first dropdown. However, upon testing, I realized that it is not displaying any results, and there are no error messages either. Can someone help me figure out what I might be missing? Appreciate your assistance!

Answer №1

It appears that this section is causing the issue:

            {% for item in city %}

                reg.push({{ item.reg }});
                name.push({{ item.name }});

            {% endfor %}

If {{ item.name }} does not contain quoted values like 'cardiff', it will display as:

name.push(cardiff)

This could lead to undefined outcomes. Adding quotes may resolve this:

name.push('{{ item.name }}')

Additionally, consider adjusting the for loop to something similar to:

for(val i = 0; i<reg.length; i++){

There is also a typo in {{ item.cit }}.

Make sure to review and include the generated HTML and JS code.

!!! Quick tip: Utilize the JS debugger tool in your browser for assistance !!!

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