如何使用Javascript输出HTML表单数据？

Question

I hit a little bit of a wall. With my current JS how do I output the current form field results in the class="household" when the user hits "add"?

*I still want to keep the remove functionality.

I cannot edit HTML only JS. Any help gladly is appreciated. Thanks!

HTML

<ol class="household"></ol>
    <form>
        <div>
            <label>Age
                <input type="text" name="age">
            </label>
        </div>
        <div>
            <label>Relationship
                <select name="rel">
                    <option value="">---</option>
                    <option value="self">Self</option>
                    <option value="spouse">Spouse</option>
                    <option value="child">Child</option>
                    <option value="parent">Parent</option>
                    <option value="grandparent">Grandparent</option>
                    <option value="other">Other</option>
                </select>
            </label>
        </div>
        <div>
            <label>Smoker?
                <input type="checkbox" name="smoker">
            </label>
        </div>
        <div>
            <button class="add">add</button>
        </div>
        <div>
            <button type="submit">submit</button>
        </div>
    </form>

JS

function validate(form) {

        fail = validateAge(form.age.value)
        fail += validateRel(form.rel.value)

        if (fail == "") return true
        else {
            alert(fail);
            return false
        }
    }

    function validateAge(field) {
        if (isNaN(field)) return "No age was entered. \n"
        else if (field < 1 || field > 1000)
            return "Age must be greater than 0. \n"
        return ""
    }

    function validateRel(field) {
        if (field == "") return "Please select a relationship \n"
        return ""

    }


    document.querySelector("form").onsubmit = function() {
        return validate(this)

    }

    document.querySelector(".add").onclick = function() {
        createinput()
    };

    count = 0;
    function createinput() {
        field_area = document.querySelector('.household')
        var li = document.createElement("li");
        var input = document.createElement("input");
        input.id = 'field' + count;
        input.name = 'field' + count;
        input.type = "text"; //Type of field - can be any valid input type like text,file,checkbox etc.
        li.appendChild(input);
        field_area.appendChild(li);
        //create the removal link
        var removalLink = document.createElement('a');
        removalLink.onclick = function() {
            this.parentNode.parentNode.removeChild(this.parentNode)
        }
        var removalText = document.createTextNode('Remove Field');
        removalLink.appendChild(removalText);
        li.appendChild(removalLink);
        count++
    }

Answer 1

The add button is submitting the form. You can prevent that by calling event.preventDefault() in the handler function.

document.querySelector(".add").onclick = function(event) {
    event.preventDefault();
    createinput()
};