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// Copyright © 2015 The CefSharp Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
using
System
;
using
System
.
Text
.
RegularExpressions
;
using
System
.
Threading
.
Tasks
;
namespace
CefSharp
.
Example
{
/// <summary>
/// Methods whose functionaity is mostly implemented by evaluating or
/// executing scripts in the browser.
/// </summary>
public
static
class
ScriptedMethods
{
/// <summary>
/// Determine if the active element in a frame accepts text input.
/// </summary>
/// <param name="frame">Test the active element in this frame.</param>
/// <returns>True if the active element accepts text input.</returns>
public
static
async
Task
<
bool
>
ActiveElementAcceptsTextInput
(
this
IFrame
frame
)
{
if
(
frame
==
null
)
{
throw
new
ArgumentException
(
"An IFrame instance is required."
,
"frame"
)
;
}
// Scripts should be minified for production builds. The script
// could also be read from a file...
const
string
script
=
@"(function ()
{
var isText = false;
var activeElement = document.activeElement;
if (activeElement) {
if (activeElement.tagName.toLowerCase() === 'textarea') {
isText = true;
} else {
if (activeElement.tagName.toLowerCase() === 'input') {
if (activeElement.hasAttribute('type')) {
var inputType = activeElement.getAttribute('type').toLowerCase();
if (inputType === 'text' || inputType === 'email' || inputType === 'password' || inputType === 'tel' || inputType === 'number' || inputType === 'range' || inputType === 'search' || inputType === 'url') {
isText = true;
}
}
}
}
}
return isText;
})();"
;
var
response
=
await
frame
.
EvaluateScriptAsync
(
script
)
;
if
(
!
response
.
Success
)
{
throw
new
Exception
(
response
.
Message
)
;
}
return
(
bool
)
response
.
Result
;
}
/// <summary>
/// Determine if the frame contains an element with the specified id.
/// </summary>
/// <param name="frame">Test the elements in this frame.</param>
/// <param name="id">The id to find.</param>
/// <returns>True if an element with the specified id exists in the frame.</returns>
public
static
async
Task
<
bool
>
ElementWithIdExists
(
this
IFrame
frame
,
string
id
)
{
if
(
frame
==
null
)
{
throw
new
ArgumentException
(
"An IFrame instance is required."
,
"frame"
)
;
}
var
script
=
@"(function () {
var n = document.getElementById('##ID##');
return n !== null && typeof n !== 'undefined';
})();"
;
// For simple inline scripts you could use String.Format() but
// beware of braces in the javascript code. If reading from a file
// it's probably safer to include tokens that can be replaced via
// regex.
script
=
Regex
.
Replace
(
script
,
"##ID##"
,
id
)
;
var
response
=
await
frame
.
EvaluateScriptAsync
(
script
)
;
if
(
!
response
.
Success
)
{
throw
new
Exception
(
response
.
Message
)
;
}
return
(
bool
)
response
.
Result
;
}
/// <summary>
/// Set an event listener on the element with the provided id. When the
/// event listener callback is invoked an attempt will be made to pass
/// event information to a .Net class bound to the browser. See
/// ScriptedMethodsBoundObject.
/// </summary>
/// <param name="frame">The element is in this frame.</param>
/// <param name="id">The id of an element that exists in the frame.</param>
/// <param name="eventName">Subscribe to this event. For example 'click'.</param>
public
static
void
ListenForEvent
(
this
IFrame
frame
,
string
id
,
string
eventName
)
{
if
(
frame
==
null
)
{
throw
new
ArgumentException
(
"An IFrame instance is required."
,
"frame"
)
;
}
// Adds a click event listener to a DOM element with the provided
// ID. When the element is clicked the ScriptedMethodsBoundObject's
// RaiseEvent function is invoked. This is one way to get
// asynchronous events from the web page. Typically though the web
// page would be aware of window.boundEvent.RaiseEvent and would
// simply raise it as needed.
//
// Scripts should be minified for production builds. The script
// could also be read from a file...
var
script
=
@"(async function ()
{
await CefSharp.BindObjectAsync('boundEvent');
var counter = 0;
var elem = document.getElementById('##ID##');
elem.removeAttribute('disabled');
elem.addEventListener('##EVENT##', function(e){
if (!window.boundEvent){
console.log('window.boundEvent does not exist.');
return;
}
counter++;
//NOTE RaiseEvent was converted to raiseEvent in JS (this is configurable when registering the object)
window.boundEvent.raiseEvent('##EVENT##', {count: counter, id: e.target.id, tagName: e.target.tagName});
});
console.log(`Added ##EVENT## listener to ${elem.id}.`);
})();"
;
// For simple inline scripts you could use String.Format() but
// beware of braces in the javascript code. If reading from a file
// it's probably safer to include tokens that can be replaced via
// regex.
script
=
Regex
.
Replace
(
script
,
"##ID##"
,
id
)
;
script
=
Regex
.
Replace
(
script
,
"##EVENT##"
,
eventName
)
;
frame
.
ExecuteJavaScriptAsync
(
script
)
;
}
}
}
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