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Jan 30, 2019 · Here Mudassar Ahmed Khan has explained with an example, how to upload and download files from Folder (Directory) in ASP.Net using C# ...

The following example is a simple demonstration of how to use JSON to translate JavaScript objects to a string format and send the string to the server using Ajax techniques; the server will then create an object based on the string. The example has no business logic and little user interaction, as it focuses on the JSON techniques both on the client side and on the server side. Figure 3-7 shows a stringified Car object. Because this example is nearly identical to the previous POST examples, we ll focus on the JSON-specific techniques. Clicking the form button invokes the doJSON function. This function first asks the getCarObject function to return a new instance of a Car object. You then use the JSON JavaScript library (freely available from www.json.org) to translate the Car object into a JSON string that is then displayed in an alert box. The JSON-encoded Car object is then sent to the server using the XMLHttpRequest object. Thanks to the freely available JSON-to-Java library, coding the Java servlet that services the JSON request is simple. Better yet, since JSON bindings are available for every flavor of server technology, you can easily implement this example using any server-side technology.



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If you want to go with using a commercial product, you should check out the LEADTOOLS PDF SDK. You can use the LEADTOOLS libraries to ...

The calculated field is removed from the pivot table layout, but remains in the PivotTable Field List. To Tip

To permanently remove a calculated field, follow these steps: 1. In the pivot table, select any cell, and on the Ribbon, under the PivotTable Tools tab, click the Options tab. 2. In the Tools group, click Formulas, and then click Calculated Field. 3. From the Name drop-down list, select the name of the calculated field you want to delete. In this example, the calculated field named Bonus is selected. 4. Click Delete, and then click OK to close the dialog box.





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The JSONExample servlet s doPost method services the JSON request. It first asks the readJSONStringFromRequestBody method to obtain the JSON string from the request body. It then creates an instance of JSONObject, supplying the JSON string to the object constructor. The JSONObject automatically parses the JSON string at object creation time. Once JSONObject is created, you can use the various get methods to retrieve the object properties in which you re interested. You use the getString and getInt methods to retrieve the year, make, model, and color properties. These properties are concatenated to form the string that is returned to the browser and displayed on the page. Figure 3-8 shows the response from the server after reading the JSON object.

Your pivot table is complex, with many fields in the Row and Column Labels areas, and several fields in the Values area. You can t tell if a formula is a calculated item or a calculated field.

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Net Component Library Developers ... UTF-8 and HTML Character Encoding · Rotating Text and Pages · PDF Files in ASP.NET ... The source code for this entire article is available for C# as a C# HTML to PDF Project Source Code Download. 5 .... To turn this into a pdf , we are using almost the same code as our HelloWorld ...

Calculated items are listed with other items in the Row or Column Labels areas of the pivot table. Calculated fields appear with the other value fields in the pivot table. Like other value fields, a calculated field s name may be preceded by Sum of. Another way to identify calculated fields is to check in the PivotTable Field List. If the name appears there, it s a calculated field. Calculated items are not listed. Also, you can create a list of all the formulas in a pivot table. See Section 3.26 for instructions.

Listing 3-11. jsonExample.html <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>JSON Example</title> <script type="text/javascript" src="json.js"></script> <script type="text/javascript"> var xmlHttp; function createXMLHttpRequest() { if (window.ActiveXObject) { xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); } else if (window.XMLHttpRequest) { xmlHttp = new XMLHttpRequest(); } } function doJSON() { var car = getCarObject(); //Use the JSON JavaScript library to stringify the Car object var carAsJSON = JSON.stringify(car); alert("Car object as JSON:\n " + carAsJSON); var url = "JSONExample timeStamp=" + new Date().getTime(); createXMLHttpRequest(); xmlHttp.open("POST", url, true); xmlHttp.onreadystatechange = handleStateChange; xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;"); xmlHttp.send(carAsJSON); } function handleStateChange() { if(xmlHttp.readyState == 4) { if(xmlHttp.status == 200) { parseResults(); } } }

You want to add a calculated item in a field, but some items are grouped, and you get an error message. For example, if you have manually grouped some of the items in a product field, and then try to create a calculated item in that field, you may see a confusing error message (see Figure 3-25). The example shown is from the GroupError.xlsx workbook.

function parseResults() { var responseDiv = document.getElementById("serverResponse"); if(responseDiv.hasChildNodes()) { responseDiv.removeChild(responseDiv.childNodes[0]); } var responseText = document.createTextNode(xmlHttp.responseText); responseDiv.appendChild(responseText); } function getCarObject() { return new Car("Dodge", "Coronet R/T", 1968, "yellow"); } function Car(make, model, year, color) { this.make = make; this.model = model; this.year = year; this.color = color; } </script> </head> <body> <br/><br/> <form action="#"> <input type="button" value="Click here to send JSON data to the server" onclick="doJSON();"/> </form> <h2>Server Response:</h2> <div id="serverResponse"></div> </body> </html> Listing 3-12. JSONExample.java package ajaxbook.chap3; import import import import import import java.io.*; java.net.*; java.text.ParseException; javax.servlet.*; javax.servlet.http.*; org.json.JSONObject;

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