Django form field feed with JavaScript produced list

xfb7svmp  于 2023-10-21  发布在  Go
关注(0)|答案(1)|浏览(80)

我是通过一个食谱发布网站学习Django的,在食谱表单中,我想传递一个用JavaScript函数动态创建的成分列表。我有两个按钮,一个用于创建列表,最后一个用于提交配方表单。问题是,每次单击配料“添加配料按钮”时,表单都会提交,因为它无效,它会重置整个表单。如何在不提交表单的情况下集成JavaScript?
我已经尝试了许多解决方案,我已经看到到处都没有用,所以任何帮助是受欢迎的。
模型

class Recipe(models.Model):
    """Represents the whole recipe description"""
    recipe_name = models.CharField(max_length=100, default=None)
    user_name = models.ForeignKey(User, on_delete=models.DO_NOTHING)
    description = models.TextField(max_length=500, help_text='Enter a brief description of the recipe')
    ingredients = models.TextField(max_length=1000, help_text='enter all the ingredients with quantities')
    cooking_time = models.CharField(max_length=50)
    preparation = models.TextField(max_length=3000, help_text='Enter the steps to prepare the recipe')
    date = models.DateField(auto_now_add=True)

剧本

function checkdata(){
        //Create references to the input elements we wish to validate
        var ingredient = document.getElementById("ingredient");
        var quantity = document.getElementById("quantity");

        //Check if username field is empty
        if(ingredient.value == ""){
                alert("Please enter the ingredient");
                ingredient.focus();
                return false;
        }
        //Check if email field is empty
        if(quantity.value == ""){
                alert("Please enter the quantity");
                quantity.focus();
                return false;
        }
        //If all is well return true.
        else{ ingList();}
    }

function ingList(){
    var values = [ingredient.value, quantity.value];
    let data =[];
    data.push(values);
    var li = document.createElement('li');
        li.innerText = data;
        list.appendChild(li);
        const list = JSON.parse(document.getElementById('myList').value=list);
    document.getElementById("ingredient").value = "";
    document.getElementById("quantity").value = "";
    return false
    }

HTML.

{% extends "base.html" %}

{% block content %}
{% load static %}
<script src="{% static 'Ingredients.js' %}"></script>
<h3><a href="{% url 'my_page' %}">BACK</a></h3>
<body>
<p>{{ user }} please fill up the form.</p>
<br>
<form action="{% url 'new_recipe' %}" method="post">
    {% csrf_token %}
    {{ form }}
    <div class="form-group">
        <div>
            <label for="recipe_name">Recipe Name: </label>
            <input id="recipe_name" type="text" name="recipe_name" value="{{ form.recipe_name }}">
        </div>
        <br>
        <div>
            <label for="description">Description: </label>
            <textarea id="description" name="description" value="{{ form.description }}"></textarea>
        </div>
        <br>
        <div>
            <label for="cooking_time">Cooking Time: </label>
            <input id="cooking_time" type="text" name="cooking_time" value="{{ form.cooking_time }}">
        </div>
        <br>
        <fieldset>
            <legend>Enter Ingredients</legend>
            <label for="ingredient">Ingredient name :</label>
            <input type="text" id="ingredient" name="ingredient">
            <span>
            <label for="quantity">Enter the quantity:</label>
            <input type="text" id="quantity" name="quantity"></span><br><br>
            <button id="add" type="button" onclick="checkdata()" value="ingredients">Add Ingredient</button>
        </fieldset>
        <br>
        <div>
            <label for="ingredients">Ingredients: </label>
            <textarea id="myList"></textarea>
        </div>
        <br>
        <div>
            <label for="preparation">Preparation: </label>
            <input id="preparation" type="text" name="preparation" value="{{ preparation }}">
        </div>
        <br>
    </div>
    <button type="submit" value="Add Recipe">Add Recipe</button>
</form>
</body>
{% endblock content %}
72qzrwbm

72qzrwbm1#

两个问题:
1.缺少type属性
您尚未指定添加配料的按钮上的类型属性。默认值为type="submit",因为它位于表单元素中。要禁用此行为,请将其更改为:

<button type="button"... ">Add Ingredient</button>

1.错误放置的事件监听器
您已经在fieldset元素上放置了一个submit事件侦听器,但是该元素会发出该事件。只有<button type="submit">和做。如果要防止在单击提交按钮时立即提交表单,请在提交按钮上附加事件侦听器:

<input type="submit" value="Add Recipe" onsubmit="checkdata(e) { e.preventDefault();}>

但是,onsubmit属性的脚本没有意义。你是否试图调用你在某处定义的函数?如果是的话,那不是你的方式。如果没有,你是不是在尝试定义一个JavaScript函数?如果是的话,那就不是一个做这件事的地方。
请分享您用于填充配料表的JavaScript代码,以便我用解决方案更新答案。
此外,除非你只是想练习使用JavaScript,否则你不需要JavaScript来添加食谱应用程序,你可以简单地使用ManyToMany字段来添加食谱的成分。

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