我有看起来像这样的形式：
<form method="post" action="">
<label for="id_count-count">Count:</label>
<input id="id_count-count" type="number" name="count-count">
<div class="extrafieldWrapper"></div>
<input type="submit" value="Submit">
</form>
根据字段
count的数量，我添加或删除新的几个字段item和item2。例如：如果字段count的值为2，它将生成两对字段item和item2。有以下字段：
<label for="id_items-0-item">Item:</label>
<input id="id_items-0-item" type="number" name="items-0-item">
<label for="id_items-0-item2">Item2:</label>
<input id="id_items-0-item2" class="children_age" type="number" name="items-0-item2" value="0">
<div class="extrafieldWrapperChAge"></div>
然后，根据字段
item2的每个值，我添加调用childrenage的新字段。 childrenage字段的外观如下：<label for="id_childrenage-0-childrenage">ChildrenAge 1</label>
<input id="id_childrenage-0-childrenage" type="number" name="childrenage-0-childrenage" value="0">
这是小提琴link。
这是我想要的和link有的图像。
取决于
item2的值，childrenage的ID也正在更改。例如，如果我将item2的值设置为'3'，则我具有id_childrenage-0-childrenage，id_childrenage-1-childrenage和id_childrenage-2-childrenage。如果我有几个item2，则有一个childrenage的新示例，这些示例从一开始就为每个item2计算其ID：<label for="id_items-0-item2">Item2:</label>
<input id="id_items-0-item2" class="children_age" type="number" name="items-0-item2" value="2">
<div class="extrafieldWrapperChAge">
<label for="id_childrenage-0-childrenage">ChildrenAge</label>
<input id="id_childrenage-0-childrenage" type="number" name="childrenage-0-childrenage" value="0">
<label for="id_childrenage-1-childrenage">ChildrenAge</label>
<input id="id_childrenage-1-childrenage" type="number" name="childrenage-1-childrenage" value="0">
</div>
<label for="id_items-0-item2">Item2:</label>
<input id="id_items-0-item2" class="children_age" type="number" name="items-0-item2" value="1">
<div class="extrafieldWrapperChAge">
<label for="id_childrenage-0-childrenage">ChildrenAge</label>
<input id="id_childrenage-0-childrenage" type="number" name="childrenage-0-childrenage" value="0">
</div>
在上面的示例中，我有2个字段
item2，其中一个值为'2'，另一个值为'1'。据此，我对于ID为childrenage和item2的第一个id_childrenage-0-childrenage有两个id_childrenage-1-childrenage字段，对于ID为childrenage的第二个字段有一个id_childrenage-0-childrenage字段。但是我需要从第一个childrenage到最后一个持续进行id item2的计数，这是示例：<label for="id_items-0-item2">Item2:</label>
<input id="id_items-0-item2" class="children_age" type="number" name="items-0-item2" value="2">
<div class="extrafieldWrapperChAge">
<label for="id_childrenage-0-childrenage">ChildrenAge</label>
<input id="id_childrenage-0-childrenage" type="number" name="childrenage-0-childrenage" value="0">
<label for="id_childrenage-1-childrenage">ChildrenAge</label>
<input id="id_childrenage-1-childrenage" type="number" name="childrenage-1-childrenage" value="0">
</div>
<label for="id_items-0-item2">Item2:</label>
<input id="id_items-0-item2" class="children_age" type="number" name="items-0-item2" value="1">
<div class="extrafieldWrapperChAge">
<label for="id_childrenage-2-childrenage">ChildrenAge</label>
<input id="id_childrenage-2-childrenage" type="number" name="childrenage-2-childrenage" value="0">
</div>
这是实现此目的的js代码：
$(function(){
$('#id_count-count').on('change', function(e){
var n = $('#id_count-count').val() || 0;
var html = "<input id='id_items-TOTAL_FORMS' type='hidden' value='" + n + "' name='items-TOTAL_FORMS'>"
+ "<input id='id_items-INITIAL_FORMS' type='hidden' value='0' name='items-INITIAL_FORMS'>"
+ "<input id='id_items-MIN_NUM_FORMS' type='hidden' value='0' name='items-MIN_NUM_FORMS'>"
+ "<input id='id_items-MAX_NUM_FORMS' type='hidden' value='15' name='items-MAX_NUM_FORMS'>";
for (var i = 0; i < n; i++) {
html += "<div>Items" + (i + 1) + "</div>"
+ "<br/><label for='id_items-" + i + "-item'>Item:</label>"
+ "<input id='id_items-" + i + "-item' type='number' name='items-" + i + "-item'/>"
+ "<label for='id_items-" + i + "-item2'>Item2:</label>"
+ "<input id='id_items-" + i + "-item2' type='number' value='0' name='items-" + i + "-item2' class='children_age'/>"
+ "<div class='extrafieldWrapperChAge'></div>";
}
$(".extrafieldWrapper").html(html);
});
$(".extrafieldWrapper").on('change', '.children_age', function(e){
var n = $(this).val() || 0;
var html = "<input id='id_childrenage-TOTAL_FORMS' type='hidden' value='" + n + "' name='childrenage-TOTAL_FORMS'>"
+ "<input id='id_childrenage-INITIAL_FORMS' type='hidden' value='0' name='childrenage-INITIAL_FORMS'>"
+ "<input id='id_childrenage-MIN_NUM_FORMS' type='hidden' value='0' name='childrenage-MIN_NUM_FORMS'>"
+ "<input id='id_childrenage-MAX_NUM_FORMS' type='hidden' value='15' name='childrenage-MAX_NUM_FORMS'>";
for (var i = 0; i < n; i++) {
html += "<br/><label for='id_childrenage-" + i + "-childrenage'>ChildrenAge "+(i+1)+"</label>"
+ "<input id='id_childrenage-" + i + "-childrenage' type='number' value='0' name='childrenage-" + i + "-childrenage' />";
}
$(this).next('.extrafieldWrapperChAge').html(html);
});
});
希望你明白我的意思。
我是Java脚本的新手，可以帮助我以正确的方式编写代码。非常感谢！
最佳答案
这个特定的答案变得不必要地冗长，因此我决定将其截断为当前的答案。
代码
$(function() {
var fieldset = $('<fieldset>');
var legend = $('<legend>');
var input = $('<input>').prop('type', 'number');
var hidden = $('<input>').prop('type', 'hidden');
var label = $('<label>');
var child_wrapper = $('<div class="child-wrapper">');
/*
Here we create a couple of new HTML elements. These elements are not a part of the
HTML DOM yet and can therefore be manipulated without any visual changes.
*/
var create_hidden_fields = function(str, fields_arr) {
var ret = [];
//return array;
$.each(fields_arr, function(i, obj) {
//Loops through each field to set up the hidden values
var h = hidden.clone();
//Clones the hidden fields
h.prop('id', 'id_' + str + '-' + obj.name).prop('name', str + '-' + obj.name).val(obj.value);
//Sets the ID, name, and value.
ret.push(h);
});
return ret;
};
$('#id_count-count').on('change', function(e) {
var n = $(this).val() || 0;
//Gets the id count value, or 0;
var hidden_fields = [{
name: 'TOTAL_FORMS',
value: n
}, {
name: 'INITIAL_FORMS',
value: 0
}, {
name: 'MIN_NUM_FORMS',
value: 0
}, {
name: 'MAX_NUM_FORMS',
value: 15
}];
//Hidden fields pre-build, makes life easier, since there seems to be a pattern
var h_arr = create_hidden_fields('items', hidden_fields);
//Hidden Array created
if ($(this.form).children(':hidden')) {
$(this.form).children(':hidden').remove();
//Removes all the current hidden fields, because lazy.
}
$(this.form).prepend(h_arr); //adds in our created hidden fields.
var form = $(this.form).children('.extra-field-wrapper');
//Gets the fieldset wrapper.
form.empty();
//Empties any children there already. Otherwise extra children are added.
for (var i = 0; i < n; i++) {
var fs_clone = fieldset.clone(); //clones the fieldset element
var l_clone = legend.clone().text("Item " + (i + 1));
// clones the legend element and adds text
var la_clone_1 = label.clone();
//label clone 1
var input_clone_1 = input.clone();
//Input clone 1
var child_wrapper_clone = child_wrapper.clone().prop('id', 'parent-' + (1 + i));
//We use clones to keep our initial values safe. This way we can alter the clones without changing our defaults
fs_clone.append(l_clone);
//Adds our legend up top for readability;
la_clone_1.prop('for', 'id-items-' + i + '-item').html('Parent ' + (i + 1));
//Adds the 'for' property with the correct ID, then sets the HTML. Item and Item2 were getting confusing
input_clone_1.prop('value', 0).prop('id', 'id-items-' + i + '-item');
//Sets the default value to 0, and the necessary ID for our label to work
var la_clone_2 = label.clone().html('# of Children').prop('for', 'id-items-' + i + '-num-children');
/*
This is a lot in one line, it clones the label element, adds the HTML, and sets the property all in one.
*/
var input_clone_2 = input.clone().prop('id', 'id-items-' + i + '-num-children').prop('value', 0).addClass('children_age');
//See above comment. One difference is that this adds our class for our next function to work
fs_clone.append([la_clone_1, input_clone_1, la_clone_2, input_clone_2, child_wrapper_clone]);
//This could probably be cleaned up, but for now it works.
form.append(fs_clone); //adds the fieldset clone to the form.
} //End for
});
$(".extra-field-wrapper").on('change', '.children_age', function(e) {
var n = $(this).val() || 0;
// the current value of the item
var append_array = [];
//Add an HTML append array, lessens calls to the $(this).next().append();
$(this).before(h_arr);
//Adds the hidden elements before this element
$(this).next('.child-wrapper').empty();
//Clears the child elements
for (var i = 0; i < n; i++) {
var l_clone = label.clone().html('Children Age' + (i + 1));
var i_clone = input.clone().addClass('child-age').prop('value', 0);
append_array.push(l_clone);
append_array.push(i_clone);
//Adds the elements to the append_array since we are now done with them.
}
$(this).next('.child-wrapper').append(append_array);
//Adds all created elements;
var children_age = $('input.child-age').each(function(i, el) {
var self = $(el);
//Lazy handle
var label = $(el).prev();
//The label is the element in front of our current element.
label.text("Child Age " + (i + 1)).prop('for', 'id_childrenage_' + i + '_childrenage');
//Gives correct label number /re does the for property;
self.prop('id', 'id_childrenage_' + i + '_childrenage');
//give correct id now that changes have been made to the dom.
});
var hidden_fields = [{
name: 'TOTAL_FORMS',
value: children_age.length
}, {
name: 'INITIAL_FORMS',
value: 0
}, {
name: 'MIN_NUM_FORMS',
value: 0
}, {
name: 'MAX_NUM_FORMS',
value: 15
}];
//We have to redeclare this function here in order for the value: n to work correctly.
if ($('#id_childrenage-TOTAL_FORMS').length == 0) {
//This element does not exist yet in the DOM
var hidden_fields = [{
name: 'TOTAL_FORMS',
value: children_age.length
}, {
name: 'INITIAL_FORMS',
value: 0
}, {
name: 'MIN_NUM_FORMS',
value: 0
}, {
name: 'MAX_NUM_FORMS',
value: 15
}];
//We have to redeclare this function here in order for the value: n to work correctly.
var h_arr = create_hidden_fields('childrenage', hidden_fields);
//creates the hidden fields
$(this.form).prepend(h_arr);
} else {
$('#id_childrenage-TOTAL_FORMS').val(children_age.length);
}
});
});label {
font-weight: 800;
}
input[type="number"] {
width: 50px;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form method="post" action="">
<label for="id_count-count">Count:</label>
<input id="id_count-count" type="number" name="count-count">
<div class="extra-field-wrapper"></div>
<input type="submit" value="Submit">
</form>说明
我在这里做了一些事情，而且可能还有更好的方法，但是我在自己的时间限制下做到了最好。
我创建了要复制到jQuery中的项目，因为我很老，而且我只是不记得有关
template标签如何工作的任何事情，因此我远离它的各种特殊魔术。字段集和图例仅用于可读性。在您的实际代码中，您可以删除它们的引用以及fs_clone和l_clone，而是直接将项目附加到form元素。我创建了一个函数，该函数仅存在于我们包装的匿名函数
create_hidden_fields中，作为程序员，数学家，而且周围所有懒惰的人，我注意到命名约定中的模式，这对我而言比创建和创建更吸引人。每次我想创建一个字段时，都要手工复制一堆物品。我对
id_childrenage-TOTAL_FORMS本身有form（顺便说一句，这是我遇到过的最奇怪的命名约定）。由于我们不需要多于1个输入副本。在两个函数中重新声明
hidden_fields数组的原因非常简单：如果在变量n之前声明了它，则TOTAL_FORMS输入将没有正确的值。不好。希望我在代码本身中的注释可以回答其他所有问题。
编码愉快。
关于javascript - 使用js计数表单字段，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/37096809/