Reading Excel file from JavaScript - javascript

I have following code for reading excel in javascript :
<html>
<head>
<script type="text/javascript">
function readData(x,y)
{
var excel = new ActiveXObject("Excel.Application");
alert(excel);
var excel_file = excel.Workbooks.Open("D:\File1.xlsx");
Excel.Visible = true;
alert(excel_file);
var excel_sheet = excel_file.Worksheets("DEPT INC UPDATE");
alert(excel_sheet);
var data = excel_sheet.Cells(x,y).Value;
alert(data);
return data;
}
</script>
</head>
<body>
<input type="button" value="SimpleButton" onclick="readData(2,3);" />
</body>
</html>
But dunno where it is going wrong ??

your input element is a submit button, but is not inside a form. When readData returns the data, nothing ever makes any use of it. and as to the rest, i dunno. you don't say where it's going wrong. does it show any one alert box?

i think there is an error in giving the path. Use double backward slashes instead of single.
In your case..
D:\File1.xlsx
Hope this might be helpful..:)

Related

How to pass values to an external Javascript script from ASP.NET

I have a set of KPI data I need to pass over to a Javascript file from my ASP.NET project. I thought I could do so using a ViewBag... Here is what is in the controller:
public ActionResult KPI()
{
if (Session["OrganizationID"] == null)
{
return RedirectToAction("Unauthorized", "Home");
}
else
{
int orgId;
int.TryParse(Session["OrganizationID"].ToString(), out orgId);
var user = db.Users.Find(User.Identity.GetUserId());
var organization = user.Organizations.Where(o => o.OrganizationID == orgId).FirstOrDefault();
var reports = db.Reports.ToList();
try
{
var org_reports = (from r in reports
where r.OrganizationID == organization.OrganizationID
select r).ToList();
var kpi = new KPI(org_reports);
var jsonKPI = JsonConvert.SerializeObject(kpi);
ViewBag.orgData = jsonKPI;
}
catch (ArgumentNullException e)
{
return RedirectToAction("Unauthorized", "Home");
}
}
return View();
}
From the View I've tried using hidden values, and also just passing them in as parameters when calling the script:
<input type="hidden" id="orgData" value=#ViewBag.orgData>
<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
<script type="text/javascript" src="~/Scripts/KPIs.js">
orgData = #ViewBag.orgData;
</script>
I then want to read this value in my JS script and parse it into JSON from the string:
function myFunction(){
var test1 = JSON.parse(document.getElementById('orgData'); // Doesn't work
var test2 = JSON.parse(orgData); // Doesn't work
}
It doesn't appear that any of these methods are working. What is my mistake here?
You should use Html.Raw, to avoid ASP.NET to escape your value:
orgData = #Html.Raw(ViewBag.orgData);
Also, if this is a Json, it is also a valid JS object, so you don't need to parse, it already is a JS Object.
It looks like you forgot the quotes.
<input type="hidden" id="orgData" value=#ViewBag.orgData>
should be
<input type="hidden" id="orgData" value="#ViewBag.orgData">
Also the code inside your script tag will never get executed because the script tag has a src attribute on it. Code inside script tags with src attributes never gets executed.
<script type="text/javascript" src="~/Scripts/KPIs.js">
orgData = #ViewBag.orgData;
</script>
should be changed to
<script type="text/javascript" src="~/Scripts/KPIs.js" />
<script>
orgData = #ViewBag.orgData;
</script>
I solved it! Pass the KPI model through the view and then it's as easy as:
var orgData = #Html.Raw(Json.Encode(Model));
Thanks to all to offered help.

Getting text from file using FileReader on Load

So, I've been working on a page that uses only local files (server is not an option, unfortunately. Not even a localhost. The struggle is real.) and I've come to a situation where I need to grab text from a .csv file and populate it to the page. I have this bit of code that works, but I need to have a file set within the function when a button is pressed. Looking up the file manually isn't an option (to visualize what I'm doing, I'm making a mock database file in the most annoying way possible (because I have to, not because I want to)).
In the page I would have something like:
<button id="myButton" onclick="getText()"></button>
<script>
var myFile = "dataset.csv";
...
</script>
The following bit of code works (in regards to having it pull the data from the csv file), but, as I said, I need to pull the text from the file when a button is pressed and just have the file name set in the script, not pulling it up manually.
<!DOCTYPE html>
<html>
<body>
<input type="file" id="fileinput" />
<div id="outputdiv"></div>
<script type="text/javascript">
function readSingleFile(evt) {
var f = evt.target.files[0];
if (f) {
var r = new FileReader();
r.onload = function(e) {
var contents = e.target.result;
var splited = contents.split(/\r\n|\n|\r|,/g);
for (i=0; i<splited.length; i++){
document.getElementById("outputdiv").innerHTML = document.getElementById("outputdiv").innerHTML + splited[i] + "<br>";
}
}
r.readAsText(f);
} else {
alert("Failed to load file");
}
}
document.getElementById('fileinput').addEventListener('change', readSingleFile, false);
</script>
</body>
</html>
From what I can tell from the API, I would need to set the file attributes to a blob in order to pass it to FileReader. How I can do this without using an input box, I have no idea. There's also a 50% chance that I am completely wrong about this since I obviously don't know how to get this done.
If someone could show me how to achieve this with regards to what I'm looking for, it would be very much appreciated. I'm absolutely stumped.
Thank you.
Note: CORS restrictons will prevent this from working in most browsers. You can use FireFox Developer Edition, which disables CORS validation.
You can use an XMLHttpRequest to load a local file:
<!DOCTYPE html>
<html>
<body>
<button onclick="readSingleFile()">Click Me</button>
<div id="outputdiv"></div>
<script type="text/javascript">
function readSingleFile() {
let xhr = new XMLHttpRequest();
let url = "relative/path/to/file.txt;
if (!url) return;
xhr.onload = dataLoaded;
xhr.onerror = _ => "There was an error loading the file.";
xhr.overrideMimeType("text/plain");
xhr.open("GET",url);
xhr.send();
}
function dataLoaded(e){
var contents = e.target.responseText;
var splited = contents.split(/\r\n|\n|\r|,/g);
for (i=0; i<splited.length; i++){
document.getElementById("outputdiv").innerHTML = document.getElementById("outputdiv").innerHTML + splited[i] + "<br>";
}
</script>
</body>
</html>

Show excel data in html without any server

I have an XLS file with data in it.
The excel file has a lot of reference in one column, so I want the user to type the reference then the web page search for the reference and show the data in the line found.
I can't use a server, so I want to do it without PHP or things like that.
Is it possible ? How can I do that ?
Thanks
Here is the sample of js-xlsx, and will return all values in all worksheets as JSON object, you may need to modify by your usage.
<html>
<script src="xlsx.core.min.js"></script>
<head></head>
<body>
</body>
<script type ="text/javascript">
"use strict";
var X = XLSX;
function convertFile(b64data) {
var wb = X.read(b64data, {type: 'base64',WTF: false});
var result = {};
wb.SheetNames.forEach(function(sheetName) {
var roa = X.utils.sheet_to_row_object_array(wb.Sheets[sheetName]);
if(roa.length > 0){
result[sheetName] = roa;
}
});
return JSON.stringify(result, 2, 2);
}
</script>
</html>
More option (by upload file, drag and drop option), you can study the source code of js-xlsx example: http://oss.sheetjs.com/js-xlsx/
You don't need PHP but at least Javascript.
You can do it like this:
var excel = new ActiveXObject("Excel.Application");
var wb = excel.Workbooks.Open("Path/to/your/excel/file.xls");
var ws = wb.ActiveSheet;
var cell = ws.Cells.Find("your search input");
alert(cell.Row);
excel.Quit();
I hope i could help you;)

the string str is always empty although it is filled with data from the.geojson file any idea?

<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script>
$(document).ready(function() {
$("#p1").load("reporting/data.geojson").toString();
var str = document.getElementById("p1").innerHTML;
document.getElementById("p2").innerHTML = str;
});
</script>
</head>
<body>
<div id="div1">
<h2>try</h2>
</div>
<p id="p1"></p>
<p id="p2"></p>
</body>
</html>
this is the code, p1 clearly shows on the screen but my actual problem is that i cant fill the string with it, "maybe the load function is the last to act i dont know" kinda new on this. I need to put the .geojson text in a string, or any other way to extract the coordinates would save me the trouble of string eddting. thank you iij advance
You need to use the callback of load to get the data from #p1.
The load method is asynchronous, so the code does not wait for the data to load and executes the next statement.
$(document).ready(function() {
$("#p1").load("reporting/data.geojson", function() {
var str = document.getElementById("p1").innerHTML;
document.getElementById("p2").innerHTML = str;
});
});
As you're using jQuery, you can use html()
$(document).ready(function () {
$("#p1").load("reporting/data.geojson", function () {
$('#p2').html($('#p1').html());
});
});

Posting form values securely from one page to another on client-side using pure Javascript and NO server-side technology

I need to POST form values from one page to another using Javascript.
Now, I know that I could use a server-side technology like ASP.Net or PHP to post values but I am not allowed to use any server side script.
I am aware that using the GET method, I can pass the form values as a query string but the values will not be passed securely (which is an important requirement!)
The conditions listed below:
This code should take the values that are posted to the page and
repost to target page. HTTP POST only (not get).
In no cases, even error, the request should not stop on this bridge page.
The script needs to handle multiple posted values.
Try to use standard javascript (no 3rd party library)
Script needs to work in IE, FF, Safari, most standard browsers
Can anyone please help me find a solution to this or point me to some resource that will help me find the soln? Thanks in advance. Below is the code for passing values as a query string. Can I modify this so that my above requirements are satisfied?
FORM
<html>
<head>
<title>Test</title>
<script type="text/javascript">
function goto_page(page) {
var usbnum = document.getElementById('usbnum').value;
var usbcode = document.getElementById('usbcode').value;
var q_str = '?usbnum=' + usbnum + '&usbcode=' + usbcode;
var url = page + q_str;
window.location = url;
}
</script>
</head>
<form id="form1" method="post">
<div>
USB No: <input name="usbnum" id="usbnum" type="text" size="80" /><br />
USB Code: <input name="usbcode" id="usbcode" type="text" size="80"/>
</div>
Next
</form>
</body>
</html>
BRIDGE PAGE
<html>
<head>
<title>Bridge Page</title>
<script type="text/javascript">
function get_params() {
var url = window.location.href;
var q_str_part = url.match(/\?(.+)$/)[1];
var val_pairs = q_str_part.split('&');
var params = {};
for (var i = 0; i < val_pairs.length; i++) {
var tmp = val_pairs[i].split('=');
params[tmp[0]] = typeof tmp[1] != 'undefined' ? tmp[1] : '';
}
return params;
}
function write_params() {
var params = get_params();
var txt = 'Hello ';
for (var i in params) {
txt += params[i] + ' ';
}
var body = document.getElementsByTagName('body')[0];
body.innerHTML += txt;
}
function write_params() {
var params = get_params();
var num_container = document.getElementById('usbnum');
var code_container = document.getElementById('usbcode');
num_container.innerHTML = params.usbnum;
code_container.innerHTML = params.usbcode;
}
</script>
</head>
<body onLoad="write_params()">
</body>
</html>
POST data can only be handled by server side code. There is no way you can use them in your javascript without help from a server side code.
You can only use GET or you can think about cookies. But at other hand, why do you want to change current page?! you can use AJAX to load more data without refreshing and no need of posting or getting variables.

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