I have a page with a "Print" link that takes the user to a printer-friendly page. The client wants a print dialog box to appear automatically when the user arrives at the print-friendly page. How can I do this with javascript?
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javascript
I know the answer has already been provided. But I just wanted to elaborate with regards to doing this in a Blazor app (razor)...
You will need to inject IJSRuntime, in order to perform JSInterop (running javascript functions from C#)
IN YOUR RAZOR PAGE:
@inject IJSRuntime JSRuntime
Once you have that injected, create a button with a click event that calls a C# method:
<MatFAB Icon="@MatIconNames.Print" OnClick="@(async () => await print())"></MatFAB>
(or something more simple if you don't use MatBlazor)
<button @onclick="@(async () => await print())">PRINT</button>
For the C# method:
public async Task print()
{
await JSRuntime.InvokeVoidAsync("printDocument");
}
NOW IN YOUR index.html:
<script>
function printDocument() {
window.print();
}
</script>
Something to note, the reason the onclick events are asynchronous is because IJSRuntime awaits it's calls such as InvokeVoidAsync
PS: If you wanted to message box in asp net core for instance:
await JSRuntime.InvokeAsync<string>("alert", "Hello user, this is the message box");
To have a confirm message box:
bool question = await JSRuntime.InvokeAsync<bool>("confirm", "Are you sure you want to do this?");
if(question == true)
{
//user clicked yes
}
else
{
//user clicked no
}
Hope this helps :)
I do this to make sure they remember to print landscape, which is necessary for a lot of pages on a lot of printers.
<a href="javascript:alert('Please be sure to set your printer to Landscape.');window.print();">Print Me...</a>
or
<body onload="alert('Please be sure to set your printer to Landscape.');window.print();">
etc.
</body>
I like this, so that you can add whatever fields you want and print it that way.
function printPage() {
var w = window.open();
var headers = $("#headers").html();
var field= $("#field1").html();
var field2= $("#field2").html();
var html = "<!DOCTYPE HTML>";
html += '<html lang="en-us">';
html += '<head><style></style></head>';
html += "<body>";
//check to see if they are null so "undefined" doesnt print on the page. <br>s optional, just to give space
if(headers != null) html += headers + "<br/><br/>";
if(field != null) html += field + "<br/><br/>";
if(field2 != null) html += field2 + "<br/><br/>";
html += "</body>";
w.document.write(html);
w.window.print();
w.document.close();
};
You could do
<body onload="window.print()">
...
</body>
You could do
<body onload="window.print()">
...
</body>
I do this to make sure they remember to print landscape, which is necessary for a lot of pages on a lot of printers.
<a href="javascript:alert('Please be sure to set your printer to Landscape.');window.print();">Print Me...</a>
or
<body onload="alert('Please be sure to set your printer to Landscape.');window.print();">
etc.
</body>
You could do
<body onload="window.print()">
...
</body>
if problem:
mywindow.print();
altenative using:
'<scr'+'ipt>print()</scr'+'ipt>'
Full:
$('.print-ticket').click(function(){
var body = $('body').html();
var ticket_area = '<aside class="widget tickets">' + $('.widget.tickets').html() + '</aside>';
$('body').html(ticket_area);
var print_html = '<html lang="tr">' + $('html').html() + '<scr'+'ipt>print()</scr'+'ipt>' + '</html>';
$('body').html(body);
var mywindow = window.open('', 'my div', 'height=600,width=800');
mywindow.document.write(print_html);
mywindow.document.close(); // necessary for IE >= 10'</html>'
mywindow.focus(); // necessary for IE >= 10
//mywindow.print();
mywindow.close();
return true;
});
You can tie it to button or on load of the page.
window.print();
If you just have a link without a click event handler:
<a href="javascript:window.print();">Print Page</a>
I know the answer has already been provided. But I just wanted to elaborate with regards to doing this in a Blazor app (razor)...
You will need to inject IJSRuntime, in order to perform JSInterop (running javascript functions from C#)
IN YOUR RAZOR PAGE:
@inject IJSRuntime JSRuntime
Once you have that injected, create a button with a click event that calls a C# method:
<MatFAB Icon="@MatIconNames.Print" OnClick="@(async () => await print())"></MatFAB>
(or something more simple if you don't use MatBlazor)
<button @onclick="@(async () => await print())">PRINT</button>
For the C# method:
public async Task print()
{
await JSRuntime.InvokeVoidAsync("printDocument");
}
NOW IN YOUR index.html:
<script>
function printDocument() {
window.print();
}
</script>
Something to note, the reason the onclick events are asynchronous is because IJSRuntime awaits it's calls such as InvokeVoidAsync
PS: If you wanted to message box in asp net core for instance:
await JSRuntime.InvokeAsync<string>("alert", "Hello user, this is the message box");
To have a confirm message box:
bool question = await JSRuntime.InvokeAsync<bool>("confirm", "Are you sure you want to do this?");
if(question == true)
{
//user clicked yes
}
else
{
//user clicked no
}
Hope this helps :)
If you just have a link without a click event handler:
<a href="javascript:window.print();">Print Page</a>
You can tie it to button or on load of the page.
window.print();
if problem:
mywindow.print();
altenative using:
'<scr'+'ipt>print()</scr'+'ipt>'
Full:
$('.print-ticket').click(function(){
var body = $('body').html();
var ticket_area = '<aside class="widget tickets">' + $('.widget.tickets').html() + '</aside>';
$('body').html(ticket_area);
var print_html = '<html lang="tr">' + $('html').html() + '<scr'+'ipt>print()</scr'+'ipt>' + '</html>';
$('body').html(body);
var mywindow = window.open('', 'my div', 'height=600,width=800');
mywindow.document.write(print_html);
mywindow.document.close(); // necessary for IE >= 10'</html>'
mywindow.focus(); // necessary for IE >= 10
//mywindow.print();
mywindow.close();
return true;
});
I like this, so that you can add whatever fields you want and print it that way.
function printPage() {
var w = window.open();
var headers = $("#headers").html();
var field= $("#field1").html();
var field2= $("#field2").html();
var html = "<!DOCTYPE HTML>";
html += '<html lang="en-us">';
html += '<head><style></style></head>';
html += "<body>";
//check to see if they are null so "undefined" doesnt print on the page. <br>s optional, just to give space
if(headers != null) html += headers + "<br/><br/>";
if(field != null) html += field + "<br/><br/>";
if(field2 != null) html += field2 + "<br/><br/>";
html += "</body>";
w.document.write(html);
w.window.print();
w.document.close();
};
You could do
<body onload="window.print()">
...
</body>
Source: Stackoverflow.com