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问题:
I am developing a Rails app with a module for dynamic - ajax - image upload to gallery. I am doing it basing on this app - multi-file-upload-demo. I am not very keen in Javascript and stuff, so I copy a lot of logic from that implementation.
I made up my app following all logic from rounders demo, I have included all gems and javascript libraries, and I get an error:
Uncaught TypeError: Cannot read property 'innerHTML' of null
in chrome console, which refers to tmpl.js file
tmpl.load = function (id) { return document.getElementById(id).innerHTML; };
My knowledge of JS doesn't make it clear to me which piece of code triggers that function so I can go further.
Can you advise me what are the next steps to investigate source of this problem? I expect potential reasons may be various, so I don't want to paste all code from the application.
回答1:
This is old but I found an actual solution to this. Change your require in application.js to //=require jquery-fileupload/basic instead of //= require jquery-fileupload.
回答2:
The reason you're getting this error is because you are missing a script tag id="template-upload" or id="template-download" or both.
Example from the Demo at: http://blueimp.github.com/jQuery-File-Upload/
<script id="template-upload" type="text/x-tmpl"> {% for (var i=0, file; file=o.files[i]; i++) { %} <tr class="template-upload fade"> <td class="preview"><span class="fade"></span></td> <td class="name"><span>{%=file.name%}</span></td> <td class="size"><span>{%=o.formatFileSize(file.size)%}</span></td> {% if (file.error) { %} <td class="error" colspan="2"><span class="label label-important">Error</span> {%=file.error%}</td> {% } else if (o.files.valid && !i) { %} <td> <div class="progress progress-success progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100" aria-valuenow="0"><div class="bar" style="width:0%;"></div></div> </td> <td class="start">{% if (!o.options.autoUpload) { %} <button class="btn btn-primary"> <i class="icon-upload icon-white"></i> <span>Start</span> </button> {% } %}</td> {% } else { %} <td colspan="2"></td> {% } %} <td class="cancel">{% if (!i) { %} <button class="btn btn-warning"> <i class="icon-ban-circle icon-white"></i> <span>Cancel</span> </button> {% } %}</td> </tr> {% } %} </script> <!-- The template to display files available for download --> <script id="template-download" type="text/x-tmpl"> {% for (var i=0, file; file=o.files[i]; i++) { %} <tr class="template-download fade"> {% if (file.error) { %} <td></td> <td class="name"><span>{%=file.name%}</span></td> <td class="size"><span>{%=o.formatFileSize(file.size)%}</span></td> <td class="error" colspan="2"><span class="label label-important">Error</span> {%=file.error%}</td> {% } else { %} <td class="preview">{% if (file.thumbnail_url) { %} <a href="{%=file.url%}" title="{%=file.name%}" data-gallery="gallery" download="{%=file.name%}"><img src="{%=file.thumbnail_url%}"></a> {% } %}</td> <td class="name"> <a href="{%=file.url%}" title="{%=file.name%}" data-gallery="{%=file.thumbnail_url&&'gallery'%}" download="{%=file.name%}">{%=file.name%}</a> </td> <td class="size"><span>{%=o.formatFileSize(file.size)%}</span></td> <td colspan="2"></td> {% } %} <td class="delete"> <button class="btn btn-danger" data-type="{%=file.delete_type%}" data-url="{%=file.delete_url%}"{% if (file.delete_with_credentials) { %} data-xhr-fields='{"withCredentials":true}'{% } %}> <i class="icon-trash icon-white"></i> <span>Delete</span> </button> <input type="checkbox" name="delete" value="1"> </td> </tr> {% } %} </script>
The UI version depends on both these templates being present.
I was having the same problem and decided to checkout what was missing.
Hope that helps.
回答3:
I ran into this same problem as well. However, loading the basic version of the file-upload plugin was not an option for me since I use previewing for one upload, but not for the other. You can disable the "preview" functionality and the attempted processing of template-upload and template-download on a case-by-case basis by setting the uploadTemplateId and downloadTemplateId options for the file-upload plugin to null.
回答4:
The error message tells us that document.getElementById(id) is returning null, so there is no element currently in the document with the specified id.
To debug, try adding a call to console.log(id); before the return statement. Once you do that you can find the value of id that is causing the problem. Hopefully the error is the result of a simple typo, remember the value of id is case-sensitive. If a typo is not the problem, you can at least set a conditional breakpoint since you now know the value of id that you want to break on. After hitting the breakpoint, it's just a matter of stepping through to the calling functions to "see which piece of code triggers that function." Hope this helps.
回答5:
I'm using this plugin for a few month, today i noticed that file upload didn't work, and i get an error
"cannot read property 'innerHTML' of null error".
I looked into it, and its because a simple reason. the file path
http://blueimp.github.io/JavaScript-Load-Image/js/load-image.min.js
changed to
http://blueimp.github.io/JavaScript-Load-Image/js/load-image.all.min.js
in the git of blueimp. as you could see here
https://github.com/blueimp/jQuery-File-Upload
the path changed in this file.
https://github.com/blueimp/jQuery-File-Upload/blob/master/index.html
I changed to the right path and its works. hope this answer will help someone here that got same problem.
