File Dialog From Javascript *without*

I am adding file import functionality to an existing page. I want to do this using javascript and without modifying the page, ie. without adding the 'input type='file' ' tag, every

Solution 1:

Well, if I understand correct what you want, is some like this...

<inputtype="button" value="Add File" onclick="document.getElementById('file').click()" />
<inputtype="file"id="file" style="display:none" />

Hidding the file object and calling the file dialog with another object. Right ?

EDIT: Only Javascript

myClickHandler() {
    var f = document.createElement('input');
    f.style.display='none';
    f.type='file';
    f.name='file';
    document.getElementById('yourformhere').appendChild(f);
    f.click();
}

button.onclick = myClickHandler

Put this in your object with the id of your form in place of yourformhere !!

Solution 2:

Here's is a way of doing it without any Javascript and it's also compatible with every browser, including mobile.

---

BTW, in Safari, the input gets disabled when hidden with display: none. A better approach would be to use position: fixed; top: -100em.

---

<label>
  Open file dialog
  <inputtype="file"style="position: fixed; top: -100em"></label>

If you prefer you can go the "correct way" by using for in the label pointing to the id of the input like this:

<labelfor="inputId">file dialog</label><inputid="inputId"type="file"style="position: fixed; top: -100em">

Solution 3:

I hid my first button like this

<input style="display:none;"type="file"id="file" name="file"/>

The following triggers the input file:

<i class="fa fa-camera-retro fa-3x" type="button" data-toggle="tooltip" title="Escoje tu foto de perfil" id="secondbutton" ></i> (i used an icon)

Which triggers my second button:

$( "#secondbutton" ).click(function() {
        $( "#file" ).click();
});

From http://api.jquery.com/click/

Solution 4:

Works for me:

exportfunctionpickFile(onFilePicked: (file: File) => void): void {
    const inputElemenet = document.createElement('input');
    inputElemenet.style.display = 'none';
    inputElemenet.type = 'file';

    inputElemenet.addEventListener('change', () => {
        if (inputElemenet.files) {
            onFilePicked(inputElemenet.files[0]);
        }
    });

    constteardown = () => {
        document.body.removeEventListener('focus', teardown, true);
        setTimeout(() => {
            document.body.removeChild(inputElemenet);
        }, 1000);
    }
    document.body.addEventListener('focus', teardown, true);

    document.body.appendChild(inputElemenet);
    inputElemenet.click();
}

And then:

pickFile((file: File) => {
    console.log(file);
})