[英]Validate file upload in rails
我需要控制圖像的權重和大小(以像素為單位),這是我的代碼:
<div class="control-group row">
<%= f.fields_for :activity_documents, @activity.activity_documents do |builder| %>
<div class="span6">
<%= builder.label "Nombre de la imagen" %>
<%= builder.text_field :name, class:'imagen_file',:required => true, data:{required:true}, :placeholder=>'Nombre de la imagen' %>
</div>
<div class="span5">
<%= builder.label "Imagen" %>
<% if builder.object.document_file_name? %>
<%= image_tag builder.object.document.url, :id=>"file" %>
<% else %>
<%= builder.file_field :document, class:'form-control',data:{required:true}, style:'background-color:#e9e9e9; width:200px;', :id => 'file' %>
<% end %>
<%= builder.link_to_remove class:'btn btn-danger' do %>
<i class="fa fa-minus"></i>
<% end %>
</div>
<% end %>
</div>
選擇圖像時需要檢查分辨率並稱重
$(document).ready(function(){
var width = $('#file').width();
var height = $('#file').height();
if(width > 400 || height > 200){
alert('please try a small image');
}
});
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