Rails背景图片上传 [英] Rails background image upload
问题描述
我使用carrierwavegem上传图片文件，也使用carrierwave backgrounder来处理上传+ RMagick在后台处理图片（我使用Delayed Job）。
一切都像一个魅力。除了一件事 - 我想上传图片，并在上传表单中显示它们（所以，所有事情都发生在同一页面上）。所以，基本上，会发生什么事情 - 因为上传和图像处理相对较慢，在发布之后呈现页面的时候 - 图像本身还没有准备好：因此image_tag显示了资产链接（href =）资产）。等待2-3秒（刷新几次）后，图像出现在屏幕上。所以，我的问题是 - 我可以以某种方式显示
对不起，长话短说。希望对您有所帮助！
预先致谢！我的解决方案非常简单：我观察数据库中是否有任何包含tmp字段的图像（st）：
tmp！= null）。如果是这样 - 他们正在后台处理，所以我使用setInterval函数，不断询问tmp是否为null：一旦它为空 - 处理是肯定的。如果没有 - 加载动画正在运行，而不是上传的图像。非常简单。
I'm using "carrierwave" gem for uploading image files and also "carrierwave backgrounder" to process the uploading + processing the image with RMagick in the background (I use Delayed Job for this).
Everything works like a charm. Except one thing - I want to upload the images and show them right under the upload form (so ,everything happens on the same page). So, basically, what happens - since the uploading and image-processing are relatively slow, by the time the page has been rendered after the posting - the image itself is not yet ready: so image_tag shows broken "assets" link (href = "assets"). After waiting 2-3 seconds (couple of refreshes), the image appears on the screen.
So, my question would be - can I somehow show the "LOADING" animation (or text, or another picture - doesn't matter) instead of broken (not yet available) image, and once it is ready - to display the image to the user. Can this be done without AJAX ? Or should I consider re-doing it with AJAX ?
Sorry for the long story. Hope for your help!
Thanks in advance! :)
My solution is pretty simple: I observe if I have any images containing "tmp" field in the database (s.t tmp != null). If so - they are being processed in the background, so I use setInterval function, that keeps asking if tmp is null or not: Once it is null - processing is done for sure. if not - loading animation is running instead of the uploaded image. Quite simple.
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