I want to download an Excel file when the user clicks on an Excel button. This is my Model and Object:
List<VMStockScreenerModel> listofStockScreener = (List<VMStockScreenerModel>)TempData["StockScreener"];
TempData["StockScreener"] = listofStockScreener;
This is the Excel button in my view:
<div class="col-md-1 padding-fx text-left" id="btn_FilterStocks">
<span onclick="DownloadFilterStocks(#listofStockScreener.ToList());" class="pull-right icon-merge" data-toggle="tooltip" title="Download">
<i class="fa fa-file-excel-o"></i>
<i class="fa fa-cloud-download"></i>
</span>
</div>
And here is my OnClick handler:
function DownloadFilterStocks() {
debugger;
var Obj = [#listofStockScreener];
Obj = JSON.stringify({ 'Obj': Obj });
var urls = '#(Html.Raw(Url.Action("Download_StockScreener","Home", new { Obj = "_Obj_"},Request.Url.Scheme)))'.replace("_Obj_", Obj);
}
Controller Code
public FileResult Download_StockScreener(VMStockScreenerModel Obj)
{
try
{
string fileName = string.Empty;
string filePath = string.Empty;
string fileName_filePath = string.Empty;
fileName_filePath = StockScreener_DownloadExcel(Obj);
if (fileName_filePath.Contains("#"))
{
filePath = fileName_filePath.Split('#')[0];
fileName = fileName_filePath.Split('#')[1];
}
if (fileName != "")
{
//return File(filePath, "text/csv", fileName);
}
else
{
return null;
}
}
catch (Exception ex)
{
Log.Logging("HomeController => Download_StockScreener", ex.Message + "\n" + ex.StackTrace);
} return null;
}
Instead of writing the whole code for you, i hope i can guide you to the answer by suggesting you the steps you need to take for making your solution work:
Instead of span, make the element an anchor a.
Render the anchor's URL server side (MVC view) without the query string part. Example: Export
In the anchor's click event, do the following:
function DownloadFilterStocks(elem) {
debugger;
var Obj = [#listofStockScreener];
var $elem = $(elem);
//this converts JS object to query string
var qParams = $.param(Obj);
//append query string to the anchor's base url
var newUrl = $elem.attr('href') + '?' + qParams;
//assign new url
$elem.attr('href', newUrl);
}
The way this will work is:
When the export link is clicked, JS code will be executed before server-side execution.
JS will update the URL/href with the query string
Server-side code will be executed with the new URL
Hope that helps you out. I ended up writing few codes anyway.
Note: My answer assumes that your server-side code is a working code.
Related
I'm using a webview2-control in a winforms application. I use messages to communicate between c# and Javascript
window.chrome.webview.addEventListener / window.chrome.webview.postMessage in Javascript
event .CoreWebView2.WebMessageReceived and method CoreWebView2.PostWebMessageAsString in C#
The communication works BUT only after the page in webview2 has been somehow refreshed. The first message sent by c# is always ignored/not received by JS. The messages after that are correcly received and processed.
My UI code:
public GUI()
{
InitializeComponent();
browser.Source = new Uri(System.IO.Path.GetFullPath("HTML/ui.html"));
InitializeAsync();
}
async void InitializeAsync()
{
await browser.EnsureCoreWebView2Async(null);
browser.CoreWebView2.WebMessageReceived += MessageReceived;
}
void MessageReceived(object sender, CoreWebView2WebMessageReceivedEventArgs args)
{
String content = args.TryGetWebMessageAsString();
if (content.StartsWith("getData"))
{
ReadDataFromCATIA();
var serializerSettings = new JsonSerializerSettings { PreserveReferencesHandling = PreserveReferencesHandling.Objects };
string jsonRootNode = JsonConvert.SerializeObject(this.RootNode, Formatting.Indented, serializerSettings); //here I've got the message I want to post
//String input = args.TryGetWebMessageAsString();
//MessageBox.Show("string from JS: " + input);
browser.CoreWebView2.PostWebMessageAsString(jsonRootNode);
}
else //object received
{
ProductNode received = JsonConvert.DeserializeObject<ProductNode>(content);
MessageBox.Show(received.PartNumber + " received");
}
}
and my JS in ui.html
window.chrome.webview.addEventListener('message', event => {
alert(event.data);
WriteDataFromCsharp(event.data);
});
function WriteDataFromCsharp(data) {
var target = document.getElementById('target');
if (target === null) { alert('target not found') };
//alert(target.id);
//target.textContent = event.data;
rootNode = JSON.parse(data);
target.innerHTML = addTable(rootNode); //addTable create an HTML table from the deserialized object rootNode
}
function RequestData() {
//function triggered by a button on the html page
//alert('post to c#');
window.chrome.webview.postMessage('getData');
}
So far, i've tried to:
ensure the javascript is as late as possible in the page (defer, at the end of body). No changes.
inject the javascript to the page after it has been loaded using .CoreWebView2.AddScriptToExecuteOnDocumentCreatedAsync(jsCode). Same behavior.
inject the javascript after once the event NavigationCompleted has fired. same behavior.
What do I miss ?
Finally found the culprit: in my HTML-page, i've used a "submit" instead of "button". With
<input type="button" value="Load data from V5" onclick="RequestData()" />
The page behavior is as expected.
I am trying to add attach my variable on my script section, since my filename is in GUID format. The filename is in hidden field:
string strDirectory = Server.MapPath(Url.Content("~/Content/AnnouncementImages/"));
string[] strFiles = Directory.GetFiles(strDirectory);
string strFileName = string.Empty;
foreach (var strFile in strFiles)
{
strFileName = Path.GetFileName(strFile);
}
<img id="myImg" src="#Url.Content("~/Content/AnnouncementImages/" + strFileName)" width="300" height="200" />
<input type="hidden" id="hiddenStringFileName" value="#strFileName"/>
In script section, I am trying to get this hidden field value:
function fncAnnouncementLoad()
{
var filename = document.getElementById('hiddenStringFileName');
//This is not working so far since it says cannot resolve symbol filename on below code:
modalImg.src = '#Url.Content("~/Content/AnnouncementImages/" + filename);
}
I am not sure what you are trying to do but if you want razor code plus javascript, you can put it in your view. Obviously this will no longer be unobtrusive javascript. But to do what you want, this will work. I added a button when you click it, it calls the function to show the concatenated URL.
#{
ViewBag.Title = "Test";
var strFileName = Guid.NewGuid();
}
<input type="hidden" id="hiddenStringFileName" value="#strFileName" />
<button onclick="fncAnnouncementLoad()">Show</button>
<script>
function fncAnnouncementLoad()
{
var filename = document.getElementById('hiddenStringFileName').value;
//This is not working so far since it says cannot resolve symbol filename on below code:
var src = '#Url.Content("~/Content/AnnouncementImages/")' + filename;
alert(src);
}
</script>
I'm creating my first watchface which requires a configuration page where two strings can be stored (a title and a message).
I'm not too familiar with all the communication things because there aren't really any full on examples out there but I've tried to get as far as possible with this.
Here is the relevant code to all my spaces
main.c
static void inbox_received_callback(DictionaryIterator *iterator, void *context) {
APP_LOG(APP_LOG_LEVEL_INFO, "Message received!");
// Get the first pair
Tuple *t = dict_read_first(iterator);
//Long lived buffers
static char title_buffer[64];
static char message_buffer[124];
// Process all pairs present
while(t != NULL) {
// Process this pair's key
switch (t->key) {
case TITLE_DATA:
snprintf(title_buffer, sizeof(title_buffer), "%s", t->value->cstring);
text_layer_set_text(title_layer, title_buffer);
APP_LOG(APP_LOG_LEVEL_INFO, "TITLE_DATA received with value %d", (int)t->value->int32);
break;
case MESSAGE_DATA:
snprintf(message_buffer, sizeof(message_buffer), "%s", t->value->cstring);
text_layer_set_text(message_layer, message_buffer);
APP_LOG(APP_LOG_LEVEL_INFO, "MESSAGE_DATA received with value %d", (int)t->value->int32);
break;
}
// Get next pair, if any
t = dict_read_next(iterator);
}
}
pebbleScript.js
var title = localStorage.getItem('title') ? localStorage.getItem('title') : 'Title',
message = localStorage.getItem('message') ? localStorage.getItem('message') : "Message that can be changed in watchface 'Settings'";
Pebble.addEventListener('showConfiguration', function(e) {
console.log("Showing configuration");
// Show config page
Pebble.openURL('https://dl.dropboxusercontent.com/s/kzl44khedt5e22d/config.html?dl=0');
});
Pebble.addEventListener('webviewclosed', function(e) {
var options = JSON.parse(decodeURIComponent(e.response));
title = encodeURIComponent(options.title);
message = encodeURIComponent(options.message);
if(title == 'undefined') {
title = 'Title';
} if (message == 'undefined') {
message = "Message that can be changed in watchface 'Settings'";
}
localStorage.setItem('title', title);
localStorage.setItem('message', message);
console.log("Configuration window returned: ", JSON.stringify(options));
});
Pebble.addEventListener('ready', function(e) {
console.log("PebbleKit JS Ready!");
//Construct a dictionary
var
dict = {
'TITLE_DATA' : title,
'MESSAGE_DATA' : message
};
//Send a string to Pebble
Pebble.sendAppMessage(dict, function(e) {
console.log("Send successful.");
}, function(e) {
console.log("Send failed!");
});
});
config.html
<h3>Title:</h3>
<input type="text" name="title" id="title"></input>
<h3>Message:</h3>
<input type="text" name="message" id="message"></input>
<br>
<input type="submit" id="cancelButton" value="Cancel">
<input type="submit" id="saveButton" value="Save">
<script>
$('#cancelButton').click(function() {
location.href = 'pebblejs://close';
});
$('#saveButton').click(function() {
var options = {
title: $('title').val(),
message: $('#message').val()
}
location.href = 'pebblejs://close#' + encodeURIComponent(JSON.stringify(options));
});
function getURLVariable(name) {
name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
var regexS = "[\\?&]"+name+"=([^&#]*)",
regex = new RegExp(regexS),
results = regex.exec(window.location.href);
if (results == null) return "";
else return results[1];
}
$(document).ready(function() {
var priorTitle = getURLVariable('title');
priorTitle = decodeURI(priorTitle);
if (priorTitle) {
$('#title').html(priorTitle);
}
var priorMessage = getURLVariable('message');
priorMessage = decodeURI(priorTitle);
if (priorMessage) {
$('#message').html(priorMessage);
}
});
</script>
If anyone can see why this isn't working as intended I'd much appreciate help :) Please let me know if there are any other details I should include.
I'm using CloudPebble for the development. I've done the title and message keys in settings and defined them in my main.c as well so it's not that.
A note that I should make is, in the app log it shows "TITLE_DATA received with value....." but not the "MESSAGE_DATA received...." So the problem may lie somewhere over there.
You're declaring your "long lived buffers" inside the function:
static void inbox_received_callback(DictionaryIterator *iterator, void *context) {
...
//Long lived buffers
static char title_buffer[64];
static char message_buffer[124];
...
}
If you want them to stay in scope (persist), you need to declare them up with the other globals:
static Window *s_main_window;
static char title_buffer[64];
static char message_buffer[124];
I tried to register an onClick-handler using jQuery, which functionality should be to change the query string in the URL and to launch a reload whilst I assign a new URL to window.location.href.
// sets a new URL with lang as query parameter indicating the language
setNewLang: function( lang ) {
var that = this;
// the url that shall be changed
var url = window.location.href;
// save possible other query parameters
var tokenizedUrl = url.split("&");
// first string in the array contains language query parameter
var tokenZero = tokenizedUrl[0].split("l=");
// set the new language query parameter in the first part of the url
tokenizedUrl[0] = tokenZero[0] + "l=" + lang;
// concatenate the splitted url
var retVal = tokenizedUrl[0];
for(i=1; i<tokenizedUrl.length; i++) {
retVal = retVal + "&" + tokenizedUrl[i];
}
console.log(retVal);
// reload page with new query parameter for language
window.location = retVal;
return false;
}
/* language selection for navbar-right*/
$("#navbarRightLanguageListEnglish").on("click", function() {
console.log("DBG-INFO"); /* even the log never appears */
that.setNewLang("en_US");
});
I tried it with firefox and it worked.
Is there a bug in chromium? Or is it a problem of scope or jQuery or ...?
If there is another solution available to change and reload the site, I would be glad to know it.
Thanks for your help.
Hey folks!
I've forgotten to post the HTML and to say that I'm using bootstrap too.
By the way, I found the bug by myself, but thank you for your help.
<!-- Language Selection -->
<div id="navbarTopLanguage" class="dropdown dd-top">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown" >Language<span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
<li id="navbarTopLanguageListEnglish" role="presentation"><a role="menuitem" tabindex="-1" href="">English</a></li>
<li id="navbarTopLanguageListDeutsch" role="presentation"><a role="menuitem" tabindex="-1" href="">Deutsch</a></li>
</ul>
</div>
<!-- End of Language Selection -->
The "href"-attributes are empty and that was my fault. Chromium gives them are (wrong) value so that clicking it has not the wwanted effect.
I fixed it with changing the javascript.
// sets a new URL with lang as query parameter indicating the language
setNewLang: function( id, lang ) {
// selfie-pattern
var that = this;
// the url that shall be changed
var url = window.location.href;
// save possible other query parameters
var tokenizedUrl = url.split("&");
// first string in the array contains language query parameter
var tokenZero = tokenizedUrl[0].split("l=");
// set the new language query parameter in the first part of the url
tokenizedUrl[0] = tokenZero[0] + "l=" + lang;
// concatenate the splitted url
var retVal = tokenizedUrl[0];
for(i=1; i<tokenizedUrl.length; i++) {
retVal = retVal + "&" + tokenizedUrl[i];
}
console.log(retVal);
// reload page with new query parameter for language
$(id).attr("href",retVal);
}
The new function replaces the value of the specified "href"-attribute (parameter "id") with the new URL.
Thanks for your help.
Please try
window.location.href = retVal;
instead of
window.location = '...'
If you don't want previous URL to go to browser history, try
window.location.replace(retVal)
Hope this helps.
#foreach (var item in Model)
{
<img src='ShowShowcaseImage/#Html.Encode(item.ProductID)' id='#item.ProductID' />
<b>#Html.DisplayFor(m => item.ProductName)</b>
Enlarge
}
<div id="EnlargeContent" class="content">
<span class="button bClose"><span>X</span></span>
<div style="margin: 10px;" id="imageContent">
</div>
<p align="center"></p>
</div>
//Popup javascript
$('.enlargeImg').bind('click', function (e) {
$.post('/Home/EnlargeShowcaseImage/' + $(this).attr('id'), null, function (data) {
document.getElementById("imageContent").innerHTML += data;
});
$('#EnlargeContent').bPopup();
});
});
//
C# method
public ActionResult EnlargeShowcaseImage(string id)
{
var imageData = //linq query for retrive bytes from database;
StringBuilder builder = new StringBuilder();
if (imageData != null)
builder.Append("<img src='" + imageData.ImageBytes + "' />");
return Json(builder);
}
I want to show pop up of enlarged image on click of enlarge link. Image is stored in bytes in database. Two images are stored in database for each product - one is thumbnail and the other is enlarged. I am showing thumbnail image and I want to show enlarged image on click of enlarge link. I can't retrieve it from database.
I can't retrieve it from database
So your question is about retrieving an image from a database, right? It has strictly nothing to do with ASP.NET MVC?
Unfortunately you haven't told us whether you are using some ORM framework to access to your database or using plain ADO.NET. Let's assume that you are using plain ADO.NET:
public byte[] GetImage(string id)
{
using (var conn = new SqlConnection("YOUR CONNECTION STRING COMES HERE"))
using (var cmd = conn.CreateCommand())
{
conn.Open();
// TODO: replace the imageData and id columns and tableName with your actual
// database table names
cmd.CommandText = "SELECT imageData FROM tableName WHERE id = #id";
cmd.Parameters.AddWithValue("#id", id);
using (var reader = cmd.ExecuteReader())
{
if (!reader.Read())
{
// there was no corresponding record found in the database
return null;
}
const int CHUNK_SIZE = 2 * 1024;
byte[] buffer = new byte[CHUNK_SIZE];
long bytesRead;
long fieldOffset = 0;
using (var stream = new MemoryStream())
{
while ((bytesRead = reader.GetBytes(reader.GetOrdinal("imageData"), fieldOffset, buffer, 0, buffer.Length)) > 0)
{
stream.Write(buffer, 0, (int)bytesRead);
fieldOffset += bytesRead;
}
return stream.ToArray();
}
}
}
}
and if you are using some ORM it could be as simple as:
public byte[] GetImage(string id)
{
using (var db = new SomeDataContext())
{
return db.Images.FirstOrDefault(x => x.Id == id).ImageData;
}
}
and then inside your controller action:
public ActionResult EnlargeShowcaseImage(string id)
{
var imageData = GetImage(id);
if (imageData != null)
{
// TODO: adjust the MIME Type of the images
return File(imageData, "image/png");
}
return new HttpNotFoundResult();
}
and it is inside your view that you should create an <img> tag pointing to this controller action upon button click:
$('.enlargeImg').bind('click', function (e) {
$('#imageContent').html(
$('<img/>', {
src: '/Home/EnlargeShowcaseImage/' + $(this).attr('id')
})
);
$('#EnlargeContent').bPopup();
});
But hardcoding the url to your controller action in javascript like this is very bad practice because when you deploy your application it might break. It might also break if you decide to change the pattern of your routes. You should never hardcode urls like this. I would recommend you generating this url on the server.
For example I see that you have subscribed to some .enlargeImage element. Let's suppose that this is an anchor. Here's how to properly generate it:
#Html.ActionLink("Enlarge", "EnlargeShowcaseImage", "Home", new { id = item.Id }, new { #class = "enlargeImage" })
and then adapt the click handler:
$('.enlargeImg').bind('click', function (e) {
// Cancel the default action of the anchor
e.preventDefault();
$('#imageContent').html(
$('<img/>', {
src: this.href
})
);
$('#EnlargeContent').bPopup();
});
Try jQuery,
Here is one
http://superdit.com/2011/06/11/hover-image-zoom-with-jquery/
http://demo.superdit.com/jquery/zoom_hover/