/// <summary>
/// Evaluates the specified JavaScript code within the scope of this
/// document. Returns the value computed by the last expression in the
/// code block after implicit conversion to a string.
/// </summary>
/// <example>
/// The following example shows an alert dialog then returns the string "4".
/// <code>
/// Eval("window.alert('Hello world!'); 2 + 2");
/// </code>
/// </example>
/// <param name="javaScriptCode">The JavaScript code</param>
/// <returns>The result converted to a string</returns>
/// <exception cref="JavaScriptException">Thrown when the JavaScript code cannot be evaluated
/// or throws an exception during evaluation</exception>
public virtual string Eval(string javaScriptCode)
{
var documentVariableName = NativeDocument.JavaScriptVariableName;
var resultVar = documentVariableName + "." + RESULT_PROPERTY_NAME;
var errorVar = documentVariableName + "." + ERROR_PROPERTY_NAME;
var exprWithAssignment = resultVar + " = '';" + errorVar + " = '';"
+ "try {"
+ resultVar + " = String(eval(" + JavascriptStringEncoder.Encode(javaScriptCode) + "))"
+ "} catch (error) {"
+ errorVar + " = 'message' in error ? error.name + ': ' + error.message : String(error)"
+ "};";
// Run the script.
RunScript(exprWithAssignment);
// See if an error occured.
var error = NativeDocument.GetPropertyValue(ERROR_PROPERTY_NAME);
if (!string.IsNullOrEmpty(error))
{
throw new JavaScriptException(error);
}
// Return the result
return(NativeDocument.GetPropertyValue(RESULT_PROPERTY_NAME));
}
public string GetCssMarkRemovalScript(string cssSelector, string markerClass)
{
return
(@"(function(cssSelector, markerClass)
{
window.jQuery(cssSelector).removeClass(markerClass);
})(" + JavascriptStringEncoder.Encode(cssSelector) + ", " + JavascriptStringEncoder.Encode(markerClass) + ");");
}
/// <summary>
/// Runs the javascript code in IE.
/// </summary>
/// <param name="javaScriptCode">The javascript code.</param>
public virtual void RunScript(string javaScriptCode)
{
if (javaScriptCode.Length > this.RunScriptMaxChunk)
{
RunScript("_watinChunkJS='';");
const string head = "_watinChunkJS+=\"";
const string tail = "\";";
const int insertSize = 1024;
const int worstCaseEncodingLengthOfInsert = 1024 * 6;
StringBuilder scriptChunk = new StringBuilder();
int maxSizeToInsertInto = this.RunScriptMaxChunk - worstCaseEncodingLengthOfInsert - tail.Length;
int stringPosition = 0;
while (stringPosition < javaScriptCode.Length)
{
scriptChunk.Append(head);
while (scriptChunk.Length < maxSizeToInsertInto &&
stringPosition < javaScriptCode.Length)
{
int amountToWrite = Math.Min(insertSize, javaScriptCode.Length - stringPosition);
JavascriptStringEncoder.JsonStringEncodeWithinDoubleParenthesis(scriptChunk,
javaScriptCode.Substring(stringPosition, amountToWrite));
stringPosition += amountToWrite;
}
scriptChunk.Append(tail);
RunScript(scriptChunk.ToString(), "javascript");
scriptChunk.Length = 0;
}
RunScript("eval(_watinChunkJS);_watinChunkJS=null;", "javascript");
}
else
{
RunScript(javaScriptCode, "javascript");
}
}
