我在我的 Rails 3 应用程序中使用嵌套表单 gem:https ://github.com/ryanb/nested_form 。我可以在我的表单中添加/删除“受众领域”。受众模型属于上传模型。
我想做的是计算在表单中添加受众字段的次数。因此,例如,表单最初将在受众字段上方显示“受众 1”。如果我添加另一个受众字段,则会显示“受众 2”,依此类推。
应用程序.js
var n = $("div.audiencefields").length;
$("span").text("Audience " + n);
我究竟做错了什么?
编辑:
应用程序.js
$("#removelink").hide().filter(":first-child").show();
$("div.audiencefields span").each(function(index, element) {
$(this).text("Audience " + (index + 1));});
nested_form.js
jQuery(function($) {
window.NestedFormEvents = function() {
this.addFields = $.proxy(this.addFields, this);
this.removeFields = $.proxy(this.removeFields, this);
};
NestedFormEvents.prototype = {
addFields: function(e) {
// Setup
var link = e.currentTarget;
var assoc = $(link).attr('data-association'); // Name of child
var content = $('#' + assoc + '_fields_blueprint').html(); // Fields template
// Make the context correct by replacing new_<parents> with the generated ID
// of each of the parent objects
var context = ($(link).closest('.fields').closestChild('input:first').attr('name') || '').replace(new RegExp('\[[a-z]+\]$'), '');
// context will be something like this for a brand new form:
// project[tasks_attributes][new_1255929127459][assignments_attributes][new_1255929128105]
// or for an edit form:
// project[tasks_attributes][0][assignments_attributes][1]
if (context) {
var parentNames = context.match(/[a-z_]+_attributes/g) || [];
var parentIds = context.match(/(new_)?[0-9]+/g) || [];
for(var i = 0; i < parentNames.length; i++) {
if(parentIds[i]) {
content = content.replace(
new RegExp('(_' + parentNames[i] + ')_.+?_', 'g'),
'$1_' + parentIds[i] + '_');
content = content.replace(
new RegExp('(\\[' + parentNames[i] + '\\])\\[.+?\\]', 'g'),
'$1[' + parentIds[i] + ']');
}
}
}
// Make a unique ID for the new child
var regexp = new RegExp('new_' + assoc, 'g');
var new_id = new Date().getTime();
content = content.replace(regexp, "new_" + new_id);
var field = this.insertFields(content, assoc, link);
$(link).closest("form")
.trigger({ type: 'nested:fieldAdded', field: field })
.trigger({ type: 'nested:fieldAdded:' + assoc, field: field });
return false;
},
insertFields: function(content, assoc, link) {
return $(content).insertBefore(link);
},
removeFields: function(e) {
var link = e.currentTarget;
var hiddenField = $(link).prev('input[type=hidden]');
hiddenField.val('1');
// if (hiddenField) {
// $(link).v
// hiddenField.value = '1';
// }
var field = $(link).closest('.fields');
field.hide();
$(link).closest("form").trigger({ type: 'nested:fieldRemoved', field: field });
return false;
}
};
window.nestedFormEvents = new NestedFormEvents();
$('form a.add_nested_fields').live('click', nestedFormEvents.addFields);
$('form a.remove_nested_fields').live('click', nestedFormEvents.removeFields);
});
// http://plugins.jquery.com/project/closestChild
/*
* Copyright 2011, Tobias Lindig
*
* Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
* and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
*
*/
(function($) {
$.fn.closestChild = function(selector) {
// breadth first search for the first matched node
if (selector && selector != '') {
var queue = [];
queue.push(this);
while(queue.length > 0) {
var node = queue.shift();
var children = node.children();
for(var i = 0; i < children.length; ++i) {
var child = $(children[i]);
if (child.is(selector)) {
return child; //well, we found one
}
queue.push(child);
}
}
}
return $();//nothing found
};
})(jQuery);
新的.html.erb
<%= f.fields_for :audiences do |audience_form| %>
<div class="audiencefields">
<span></span>
<p>
<%= audience_form.label :number_of_people %><br />
<%= audience_form.text_field :number_of_people %>
</p>
<p>
<%= audience_form.label :gender %><br />
<%= audience_form.text_field :gender %>
</p>
<p>
<%= audience_form.label :ethnicity %><br />
<%= audience_form.text_field :ethnicity %>
</p>
<p>
<%= audience_form.label :age %><br />
<%= audience_form.text_field :age %>
</p>
</div>
<%= audience_form.link_to_remove "Remove this", :id => "removelink" %>
<% end %>
<p><%= f.link_to_add "Add this", :audiences, :id => "addlink" %></p>