javascript - 自定义文件输入按钮不会选择文件

Question

我正在尝试使用 css/javascript 创建一个简单的文件选择按钮。我现在遇到的问题是，当我单击自定义按钮以激活隐藏文件输入按钮时，它被认为是空的。如何使用 simple_form 输入和普通 html 按钮激活隐藏文件输入按钮？

//story.js
$(document).ready(function () {
	let realFileBtn = document.getElementById("story_story_video");
	let customBtn = document.getElementById("story-file-upload-btn");
	let customText = document.getElementById("story-file-upload-text");

	if(customBtn){
		customBtn.addEventListener("click", function () {
			realFileBtn.click();
		});
	}


	realFileBtn.addEventListener("change", function () {
		if (realFileBtn.value) {
			customText.innerHTML = realFileBtn.value;
		} else {
			customText.innerHTML = "No video selected"
		}
	});
});

//story.scss

//Real File Upload Button
#story_story_video {
  display: none;
}

// Custom File Input Button
#story-file-upload-btn {
  background-color: #bf318d;
  color: #ffffff;
  padding: 10px;
  border-radius: 0.12em;
  border: 1px solid #6a6a6a;
  transition: 0.3s;
}

#story-file-upload-btn:hover {
  background: #942a69;
  cursor: pointer;
}

// Custom Text that shows which file you chose
.story-file-upload-text {
  margin-left: 10px;
  font-family: Arial, Helvetica, sans-serif;
  color: #aaaaaa;
}

<!--_form.html.erb-->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="form-group">
	<button type="button" id="story-file-upload-btn">Select Video</button>
  <br>
	<%= f.input :story_video, class: 'form-control', label: false %>
	<span id="story-file-upload-text">No video selected</span>
</div>

JavaScript 堆栈跟踪

Uncaught TypeError: Cannot read property 'addEventListener' of null
    at HTMLDocument.<anonymous> (story_file_upload_btn.self-eb557f85ebb94b2e2cbd43807a4fc248af863cd160e98e593784d35dfff6daf2.js?body=1:13)
    at mightThrow (jquery3.self-06c43429d1047ce3f355da574d8a9750209971b8b1b8f264f91f5518c5fcc060.js?body=1:3584)
    at process (jquery3.self-06c43429d1047ce3f355da574d8a9750209971b8b1b8f264f91f5518c5fcc060.js?body=1:3652)

Answer 1

对于文件输入，你需要使用file_field :

<%= f.file_field :story_video, class: 'form-control', label: false %>

另请注意，如果您使用 form_with 而不是 form_for，则需要明确指定输入 ID，因为 form_with 不生成 ID。