[英]Upload images to uploads folder _ JavaScript
Users will be able to either send a text post(input type="text") or image post(input type="file"). 用户将能够发送文本帖子(输入类型=“ text”)或图像帖子(输入类型=“ file”)。 But they won't be sending both
但是他们不会同时发送
Here's my form (in Jade): 这是我的表格(在Jade中):
form#addPost(action="/uploads", method="post", placeholder='Add your ideas here...')
input#postinput(type="text", name="contents" placeholder="Add your ideas here...")
div.privacy(class="onoffswitch", id='privacytog')
input(type="checkbox" name="onoffswitch" class="onoffswitch-checkbox" id="myonoffswitch" checked)
label(class="onoffswitch-label" for="myonoffswitch")
span(class="onoffswitch-inner")
span(class="onoffswitch-switch")
<div style="height:0px;overflow:hidden">
<input type="file" id="fileInput" name="fileInput" accept="image/*">
</div>
input#submit1(type="submit", value="Post")
And Here's my app.js(server-side code) 这是我的app.js(服务器端代码)
var util = require("util");
var fs = require("fs");
var bodyParser = require('body-parser');
var multer = require("multer");
app.use(multer({
dest: "./public/uploads/"
}));
app.post("/uploads", function(req, res) {
var data = req.body;
var id = req.user._id;
var username = req.user.username;
var date = Date();
var onOff = false;
if (req.body.onoffswitch) {
onOff = true;
}
//Images upload to uploads folder
if (req.files) {
console.log(util.inspect(req.files));
if (req.files.fileInput.size === 0) {
return next(new Error("Hey, first would you select a file?"));
}
fs.exists(req.files.fileInput.path, function(exists) {
if(exists) {
res.end("Got your file!");
} else {
res.end("Well, there is no magic for those who don’t believe in it!");
}
});
}
User.findById(id, function(err, user) {
if (err) return handleErr(err);
var uid = shortid.generate();
newPost = {
//If sending down an Image use data.fileInput not contents
contents: [data.contents || '/img/'+data.fileInput],
_id: uid,
privacy: onOff,
username: req.user.username,
date: date,
rating: Number(0),
uwv: []
};
user.posts.push(newPost);
user.save(function(err, user){
if(err) return handleErr(err);
if(newPost.privacy === 'false'){
for (var i = 0; i < user.followers.length; i++) {
User.findOne({username:user.followers[i]}, function(err, follower){
follower.discover.push(newPost)
follower.save();
});
}
}
});
});
}
Images are being uploaded and saved to uploads folder. 图片正在上传并保存到上载文件夹。 However when posting just a text post(only filling in input type="text") it keeps throwing back the error: Cannot read property 'size' of undefined
但是,当仅发布文本帖子(仅填写输入type =“ text”)时,它会不断抛出错误:无法读取未定义的属性'size'
Typically browsers will not send the file field if there is no file selected, so there is no way for the backend to know that there was such a field. 通常,如果没有选择文件,浏览器将不会发送文件字段,因此后端无法知道存在这样的字段。
Instead just check for the existence of the file field: if (!req.files.fileInput)
. 相反,只需检查文件字段是否存在:
if (!req.files.fileInput)
。 You may also want to check that the file is not empty: if (!req.files.fileInput || !req.files.fileInput.size)
您可能还需要检查文件是否为空:
if (!req.files.fileInput || !req.files.fileInput.size)
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