[英]Conditionally show fields on Ruby on Rails form
I have a Ruby on Rails app using Bootstrap for styling. 我有一个使用Bootstrap进行样式设计的Ruby on Rails应用程序。 This is a snippet from a form and I want to make a field visible once the non-blank value from the previous field is selected.
这是表单的摘要,一旦选择了上一个字段的非空白值,我想使该字段可见。 Thus, once non-blank 'criteria' is selected, I want to make the 'criteria_reason' field visible.
因此,一旦选择了非空白的“条件”,我想使“ criteria_reason”字段可见。 How can this code be fixed?
该代码如何固定?
<%= f.select :criteria, ['', 'Yes', 'No', 'Maybe'] %>
<%= f.text_field :criteria_reason, class:"form-control", placeholder:'Reason',
style:"#{'display:none' if :criteria == ''}" %>
Thanks! 谢谢!
you can use javascript to make it visible on invisible when you click drop-down. 您可以使用JavaScript在单击下拉菜单时将其显示为不可见。
<script type="text/javascript">
$(function () {
$("#category_category_id").change(function () {
var category = $(this).val();
if (category != "") {
$("#category_criteria_reason").show();
} else {
$("#category_criteria_reason").hide();
}
});
});
</script>
change category_
with you own form class. 使用您自己的表单类更改
category_
。 Then, you can change you default code into 然后,您可以将默认代码更改为
<%= f.text_field :criteria_reason, class:"form-control", placeholder:'Reason',
style:"#{'display:none' if f.object.criteria == ''}" %>
by calling form_for @object do |f|
通过调用
form_for @object do |f|
you are passing @object
into a ActionView::FormBuilder
. 您将
@object
传递到ActionView::FormBuilder
。 In f
you can access the related object by calling f.object
在
f
您可以通过调用f.object
来访问相关对象
so in this case you need to do 所以在这种情况下,您需要
<%= f.text_field :criteria_reason, class:"form-control", placeholder:'Reason',
style:"#{'display:none' if f.object.criteria == ''}" %>
see http://api.rubyonrails.org/classes/ActionView/Helpers/FormBuilder.html 参见http://api.rubyonrails.org/classes/ActionView/Helpers/FormBuilder.html
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