根据值动态添加表单字段

Dynamic add form fields depending the value

本文关键字：表单 字段 添加 动态      更新时间：2023-09-26

在我的Django应用程序中，我有一个带有"rooms"字段的表单，它是整数字段。根据房间的数量，我想为每个房间生成另外两个字段"成人"answers"儿童"。我在java脚本上看到了很多这样做的例子，所以我试着自己写这个脚本，但它不起作用。浏览器上没有错误。我是java脚本的新手，你能告诉我做错了什么吗

Here is my html file

<div class="fieldWrapper">
    <label for="id_rooms">Rooms:</label>
    <input id="id_rooms" type="number" name="rooms" min="1">
</div>

js file:

$(function() {
    var newFields = $('');
    $('#id_rooms').bind('blur keyup change', function() {
        var n = this.value || 0;
        if (n + 1) {
            if (n > newFields.length) {
                addFields(n);
            } else {
                removeFields(n);
            }
        }
    });
    function addFields(n) {
        for (form_num = newFields.lenght; form_num < n; form_num++) {
            $("input[id='id_form-TOTAL_FORMS']").attr('value', form_num + 1);
            $(".extrafieldWrapper").append("<br/><label for='id_form-" + form_num + "-adult'>Adult:</label> <input id='id_form-" + form_num + "-adult' type='number' name='form-" + form_num + "-adult'/> <label for='id_form-" + form_num + "-children'>Children:</label> <input id='id_form-" + form_num + "-children' type='number'  name='form-" + form_num + "-children'/> ");
        }
    }
    function removeFields(n) {
        var removeField = newFields.slice(n).remove();
        newFields = newFields.not(removeField);
    }
});

谢谢你的帮助。

HTML-

<div class="fieldWrapper">
<label for="id_rooms">Rooms:</label>
<input id="id_rooms" type="number" name="rooms" min="1">
</div>
<div class="extrafieldWrapper">    
</div>

Javascript-

$(function() {
var newFields = $('');
$('#id_rooms').bind('blur keyup change', function() {
    var n = this.value || 0;
    if (n + 1) {
        if (n > newFields.length) {
            addFields(n);
        } else {
            removeFields(n);
        }
    }
});
function addFields(n) {
    for (form_num = newFields.length; form_num < n; form_num++) { // lenght->length
        $("input[id='id_form-TOTAL_FORMS']").attr('value', form_num + 1);
        $(".extrafieldWrapper").append("<br/><label for='id_form-" + form_num + "-adult'>Adult:</label> <input id='id_form-" + form_num + "-adult' type='number' name='form-" + form_num + "-adult'/> <label for='id_form-" + form_num + "-children'>Children:</label> <input id='id_form-" + form_num + "-children' type='number'  name='form-" + form_num + "-children'/> ");
    }
}
function removeFields(n) {
    var removeField = newFields.slice(n).remove();
    newFields = newFields.not(removeField);
}
} );

HTML

<div class="fieldWrapper">
    <label for="id_rooms">Rooms:</label>
    <input id="id_rooms" type="number" name="rooms" min="1">
</div>
<div class="extrafieldWrapper"></div>

JS-

$(function() {
var newFields = $('');
$('#id_rooms').bind('blur keyup change', function() {
    var n = this.value || 0;
    if (n + 1) {
        if (n > newFields.length) {
            addFields(n);
        } else {
            removeFields(n);
        }
    }
});
function addFields(n) {
    for (form_num = newFields.length; form_num < n; form_num++) { // lenght->length
        $("input[id='id_form-TOTAL_FORMS']").attr('value', form_num + 1);
        $(".extrafieldWrapper").append("<br/><label for='id_form-" + form_num + "-adult'>Adult:</label> <input id='id_form-" + form_num + "-adult' type='number' name='form-" + form_num + "-adult'/> <label for='id_form-" + form_num + "-children'>Children:</label> <input id='id_form-" + form_num + "-children' type='number'  name='form-" + form_num + "-children'/> ");
    }
}
function removeFields(n) {
    $('.extrafieldWrapper').html('');
}
});

这是一把小提琴：https://jsfiddle.net/ymz60pjm/

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