Adding file inputs dynamicly with jquery?

问题:

Hi,

To make my weppage as complatible as possible I will go with the reguler file input, the problem is that I need to offer multiple uploads.

My thought is that when the first input is set a second will be shown (up to a max of 10). Say that we have filled 5 and there is 6 visible. We now clear the second input, this will result in two empty inputs so then the last(6(empty)) input should be hidden.

Is this possible to to with Jquery? Maby you have a example?

Pleas advice.

BestRegards

Edit1 : This is what I manage to create, it works fine. I am however sure that someone that know jquery better could make a smarter script:

In the view :

        <div id="fileInput0" class="fileVisible">
            <input type="file" id="file0" name="files" />
            <input type="button" value="Töm" onclick="resetFileField(0)" />
        </div>
        <div id="fileInput1" class="fileHidden">
            <input type="file" id="file1" name="files" />
            <input type="button" value="Töm" onclick="resetFileField(1)" />
        </div>
        <div id="fileInput2" class="fileHidden">
            <input type="file" id="file2" name="files" />
            <input type="button" value="Töm" onclick="resetFileField(2)" />
        </div>
        <div id="fileInput3" class="fileHidden">
            <input type="file" id="file3" name="files" />
            <input type="button" value="Töm" onclick="resetFileField(3)" />
        </div>
        <div id="fileInput4" class="fileHidden">
            <input type="file" id="file4" name="files" />
            <input type="button" value="Töm" onclick="resetFileField(4)" />
        </div>
        <div id="fileInput5" class="fileHidden">
            <input type="file" id="file5" name="files" />
            <input type="button" value="Töm" onclick="resetFileField(5)" />
        </div>         
        <div id="fileInput6" class="fileHidden">
            <input type="file" id="file6" name="files" />
            <input type="button" value="Töm" onclick="resetFileField(6)" />
        </div>
        <div id="fileInput7" class="fileHidden">
            <input type="file" id="file7" name="files" />
            <input type="button" value="Töm" onclick="resetFileField(7)" />
        </div>
        <div id="fileInput8" class="fileHidden">
            <input type="file" id="file8" name="files" />
            <input type="button" value="Töm" onclick="resetFileField(8)" />
        </div>
        <div id="fileInput9" class="fileHidden">
            <input type="file" id="file9" name="files" />
            <input type="button" value="Töm" onclick="resetFileField(9)" />
        </div>

The Script :

function fileChangeHandler() {

    var hiddenClass = 'fileHidden';
    var visibleClass = 'fileVisible';

    var parentDiv = $(this).parent;
    var idNr = $(this).attr('id').replace('file', '');

    idNr++;

    if($(this).val().length > 0){

        for(var i = idNr; i < 10; i++){
            if($('#fileInput' + i).hasClass(visibleClass)){
                if($('#file' + i).val().length < 1){ return;}
            }
            else{
                    $('#fileInput' + i).attr('class' , visibleClass);
                    return;
            }
        }
    }
}

function resetFileField(id) {
    var hiddenClass = 'fileHidden';
    var visibleClass = 'fileVisible';
    var counter;

    $('#fileInput'+id).html($('#fileInput'+id).html());
    $('#file'+id).change(fileChangeHandler);

    for(var i = 9; i > -1 ;i--)
    {

        if(id != i)
        {
            if($('#fileInput' + i).hasClass(visibleClass)){
                if($('#file' + i).val().length < 1){
                    $('#fileInput' + i).attr('class', hiddenClass);
                }
            }
        }
    } 
}

If you find a better solution, pleas let me know.

回答1:

You could have a container div which will harbor the new file input fields and a button to add new inputs:

$('#addFile').click(function() {
    // when the add file button is clicked append
    // a new <input type="file" name="someName" />
    // to a filesContainer div
    $('#filesContainer').append(
        $('<input/>').attr('type', 'file').attr('name', 'someName')
    );
});

回答2:

Yes, you can just add a file input to the form as you would any other element:

$("#theForm").append("<input type='file' name='foo'>");

I thought this sounded familiar: [jquery]How do I add file uploads dynamically?

回答3:

Another option, since you are using JQuery is the Bootstrap fileInput. It lets you upload multiple images with one control. You have additional options too like the allowed file types, size, height, width, etc.

<script type="text/javascript">
    $("#postedImage").fileinput({
      uploadUrl: "/SomeUrl", // you must set this for ajax uploads
      maxFileCount: 10,
      enctype: "multipart/form-data",
      overwriteInitial: false
    });
</script>

<input id="postedImage" type="file" class="file" multiple>

Here is a link for other uploaders if you are interested.

回答4:

if you want to have diffrent input names

var i;
$('#addFile').click(function() {
    i=i+1;
    $('#filesContainer').append(
        $('<input/>').attr('type', 'file').attr('name', 'file'+i)
    );
});