CODEWITHSUNDEEP
javascript
John Smith
John Smith

Reputation: 31

Load a file automatically without using a click button

I am new to javascript and want to load the file without having to click on the load file button

I am using the following script and I want the text to be loaded automatically in the text box.

<html>
    <body>
        <table>
            <tr>
                <td>Select a File to Load:</td>
                <td>
                    <input type="file" id="fileToLoad">
                </td>
                <td>
                    <button onclick="loadFileAsText()">Load File</button>
                <td>
            </tr>
            <tr>
                <td colspan="3">
                    <textarea id="inputTextToSave" style="width:512px;height:256px"></textarea>
                </td></tr>
            </tr>
        </table>
    </body>
</html>

<script type='text/javascript'>
function loadFileAsText()
{
    var fileToLoad = document.getElementById("fileToLoad").files[0];
    var fileReader = new FileReader();
    fileReader.onload = function(fileLoadedEvent) 
    {
        var textFromFileLoaded = fileLoadedEvent.target.result;
        document.getElementById("inputTextToSave").value = textFromFileLoaded;
    };
    fileReader.readAsText(fileToLoad, "UTF-8");
}
</script>

Thanks in advance for the help.

Upvotes: 1

Views: 4995

Answers (4)

NewToJS
NewToJS

Reputation: 2772

Try adding the onchange attribute, this will call functions when changes have been made to that input. 

<input type="file" id="fileToLoad" onchange="loadFileAsText()">

Demo

function loadFileAsText(){
var fileToLoad = document.getElementById("fileToLoad").files[0];
var fileReader = new FileReader();
    fileReader.onload = function(fileLoadedEvent){ 
        document.getElementById("inputTextToSave").value = fileLoadedEvent.target.result;
    };
fileReader.readAsText(fileToLoad, "UTF-8");
}
<table><tr>
<td>Select a File to Load:</td>
<td><input type="file" id="fileToLoad" onchange="loadFileAsText()"></td>
                                 <!-- ^^ onchange attribute added ^^ -->
</tr><tr>
<td colspan="2"><textarea id="inputTextToSave" style="width:512px;height:256px"></textarea></td>
</tr></table>

If you have any questions about the above source code please leave a comment below and I will get back to you as soon as possible.

I hope this helps. Happy coding!

Upvotes: 3

dsh
dsh

Reputation: 12214

Respond to the document's ready event:

$(document).ready( loadFileAsText );

If you don't want to use jQuery for simple compatibility with multiple browsers, then see this answer: pure JavaScript equivalent to jQuery's $.ready() how to call a function when the page/dom is ready for it

Upvotes: 0

Manju
Manju

Reputation: 79

You can do it using Javascript events. for ex: you can call like below:

<input type="file" id="fileToLoad" onblur="loadFileAsText()">

Upvotes: 0

vsvs
vsvs

Reputation: 2035

You can just call the function on it's own like this:

loadFileAsText();

Upvotes: 0

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