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I am currently working on Windows 10 UWP App and facing an issue with WebView that when I have less HTML content, I am getting more height in javascript. My Code is as follows
WebView webView = new WebView() { IsHitTestVisible = true };
string notifyJS = @"<script type='text/javascript' language='javascript'>
function setupBrowser(){
document.touchmove=function(){return false;};;
document.onmousemove=function(){return false;};
document.onselectstart=function(){return false;};
document.ondragstart=function(){return false;}
window.external.notify('ContentHeight:'+document.body.firstChild.offsetHeight);
//window.external.notify('ContentHeight:'+document.getElementById('pageWrapper').offsetHeight);
var links = document.getElementsByTagName('a');
for(var i=0;i<links.length;i++) {
links[i].onclick = function() {
window.external.notify(this.href);
return false;
}
}
}
</script>";
string htmlContent;
if (hexcolor != null)
{
htmlContent = string.Format("<html><head>{0}</head>" +
"<body onLoad=\"setupBrowser()\" style=\"margin:0px;padding:0px;background-color:{2};\">" +
"<div id=\"pageWrapper\" style=\"width:100%;word-wrap:break-word;padding:0px 25px 0px 25px\">{1}</div></body></html>",
notifyJS,
formItem.I_DEFAULT_VALUE,
hexcolor);
}
Here formItem.I_DEFAULT_VALUE is
HTML without html,head and body tags and its value is
<p>
<span style="font-size: 14px;">To help us investigate your query please can you make a sheet using the following </span><a href=".pdf" style="font-size: 14px;" target="_blank">document</a><span style="font-size: 14px;">.</span></p>
<p>
<strong><span style="font-size: 14px;">Testing WebView Height</span></strong></p>
HexColor is background color that needs to be applied.
And my script_notify method is as follows:
webView.ScriptNotify += async (sender, e) =>
{
if (e.Value.StartsWith("ContentHeight"))
{
(sender as WebView).Height = Convert.ToDouble(e.Value.Split(':')[1]);
return;
}
if (!string.IsNullOrEmpty(e.Value))
{
string href = e.Value.ToLower();
if (href.StartsWith("mailto:"))
{
LauncherOptions options = new LauncherOptions();
options.DisplayApplicationPicker = true;
options.TreatAsUntrusted = true;
var success = await Launcher.LaunchUriAsync(new Uri(e.Value), options);
}
else if (href.StartsWith("tel:"))
{
LauncherOptions options = new LauncherOptions();
options.DisplayApplicationPicker = true;
options.TreatAsUntrusted = true;
var success = await Launcher.LaunchUriAsync(new Uri(e.Value), options);
}
else
{
LauncherOptions options = new LauncherOptions();
options.DisplayApplicationPicker = true;
options.TreatAsUntrusted = true;
var success = await Launcher.LaunchUriAsync(new Uri(e.Value), options);
}
}
};
Can someone suggest why I am getting very large height even if content is small?
I am currently working on Windows 10 UWP App and facing an issue with WebView that when I have less HTML content, I am getting more height in javascript. My Code is as follows
WebView webView = new WebView() { IsHitTestVisible = true };
string notifyJS = @"<script type='text/javascript' language='javascript'>
function setupBrowser(){
document.touchmove=function(){return false;};;
document.onmousemove=function(){return false;};
document.onselectstart=function(){return false;};
document.ondragstart=function(){return false;}
window.external.notify('ContentHeight:'+document.body.firstChild.offsetHeight);
//window.external.notify('ContentHeight:'+document.getElementById('pageWrapper').offsetHeight);
var links = document.getElementsByTagName('a');
for(var i=0;i<links.length;i++) {
links[i].onclick = function() {
window.external.notify(this.href);
return false;
}
}
}
</script>";
string htmlContent;
if (hexcolor != null)
{
htmlContent = string.Format("<html><head>{0}</head>" +
"<body onLoad=\"setupBrowser()\" style=\"margin:0px;padding:0px;background-color:{2};\">" +
"<div id=\"pageWrapper\" style=\"width:100%;word-wrap:break-word;padding:0px 25px 0px 25px\">{1}</div></body></html>",
notifyJS,
formItem.I_DEFAULT_VALUE,
hexcolor);
}
Here formItem.I_DEFAULT_VALUE is
HTML without html,head and body tags and its value is
<p>
<span style="font-size: 14px;">To help us investigate your query please can you make a sheet using the following </span><a href="http://www.pdf995./samples/pdf.pdf" style="font-size: 14px;" target="_blank">document</a><span style="font-size: 14px;">.</span></p>
<p>
<strong><span style="font-size: 14px;">Testing WebView Height</span></strong></p>
HexColor is background color that needs to be applied.
And my script_notify method is as follows:
webView.ScriptNotify += async (sender, e) =>
{
if (e.Value.StartsWith("ContentHeight"))
{
(sender as WebView).Height = Convert.ToDouble(e.Value.Split(':')[1]);
return;
}
if (!string.IsNullOrEmpty(e.Value))
{
string href = e.Value.ToLower();
if (href.StartsWith("mailto:"))
{
LauncherOptions options = new LauncherOptions();
options.DisplayApplicationPicker = true;
options.TreatAsUntrusted = true;
var success = await Launcher.LaunchUriAsync(new Uri(e.Value), options);
}
else if (href.StartsWith("tel:"))
{
LauncherOptions options = new LauncherOptions();
options.DisplayApplicationPicker = true;
options.TreatAsUntrusted = true;
var success = await Launcher.LaunchUriAsync(new Uri(e.Value), options);
}
else
{
LauncherOptions options = new LauncherOptions();
options.DisplayApplicationPicker = true;
options.TreatAsUntrusted = true;
var success = await Launcher.LaunchUriAsync(new Uri(e.Value), options);
}
}
};
Can someone suggest why I am getting very large height even if content is small?
Share Improve this question edited Oct 12, 2016 at 8:47 Kinjan Bhavsar asked Oct 7, 2016 at 16:43 Kinjan BhavsarKinjan Bhavsar 1,44928 silver badges59 bronze badges 16-
I made a demo from your codes, but didn't reproduced your problem. The webView's height got resized correctly. Could you please post the codes of
formItem.I_DEFAULT_VALUEor maybe share a basic demo that can reproduce this problem. And I'm usingWebView.NavigateToStringto render the html content. – Elvis Xia - MSFT Commented Oct 12, 2016 at 8:18 -
@ElvisXia-MSFT I have added
formItem.I_DEFAULT_VALUEand I am also usingWebView.NavigateToString. Also, I am creatingwebviewdynamically using C# not XAML. – Kinjan Bhavsar Commented Oct 12, 2016 at 8:49 -
@ElvisXia-MSFT Also use
window.external.notify('ContentHeight:'+document.body.firstChild.offsetHeight);– Kinjan Bhavsar Commented Oct 12, 2016 at 8:56 - Still not reproduceable. you can try my demo here:WebViewDynamicHeightSample. – Elvis Xia - MSFT Commented Oct 12, 2016 at 9:00
- :-( Don't know why it is not working at my side. I will try to create demo project and will check if I can reproduce the issue in that. – Kinjan Bhavsar Commented Oct 12, 2016 at 9:36
3 Answers
Reset to default 5you could try to parse the string "document.body.scrollHeight.toString()" after your content loads in order to set a new height for your webview. Here's an example with NavigationCompleted but you could use a custom event
public static class WebViewExtensions
{
public static void ResizeToContent(this WebView webView)
{
var heightString = webView.InvokeScript("eval", new[] {"document.body.scrollHeight.toString()" });
int height;
if (int.TryParse(heightString, out height))
{
webView.Height = height;
}
}
}
public Page()
{
MyWebView.NavigationCompleted += (sender, args) => sender.ResizeToContent();
MyWebView.Navigate(new Uri("index.html"));
}
I'm not sure why you are getting a value that is too high, I faced a slightly different issue: the height of the document I got was too small (the height did seemingly not account for images). I have tried multiple events (NavigationFinished, LoadCompleted, ...) but in none of these events I was able to get an accurate height.
What finally worked for me was waiting for a short period until I send back the height of the document. Not exactly a great solution, I hope I will be able to simplify this at some point. Perhaps this also works for your issue.
I inject a script that waits for 100 miliseconds and then sends it back. Even if the image wasn't fully loaded yet, the content size was accurate for me.
window.setTimeout(function () {
var height = document.body.scrollHeight.toString();
window.external.notify("ContentHeight:" + height);
}, 100);
I found the key is to be sure the WebView widgets are visible. If they are invisible due to Visibility or just not yet added to a visible container, then the document.body.scrollHeight won't be a viable way to get the height of the contents. I have a ProgressRing in a modal popup in order to prevent app usage prior to being ready, instead of tying that to visibility.
本文标签： javascriptHow to resize Webview height based on HTML content in Windows 10 UWPStack Overflow
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