牛课网2012微软认证考试考前训练题9

2012微软认证考试考前训练题9

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QUESTION 9
You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5.
You write the following code segment to create a client-script function. (Line numbers are included for reference only.)
01 function updateLabelControl(labelId, newText) {
02 var label = $find(labelId);
03 label.innerHTML = newText;
04 }
The client script function uses ASP.NET AJAX and updates the text of any Label control in the Web form.
When you test the client script function, you discover that the Label controls are not updated.
You receive the following JavaScript error message in the browser: "’null’ is null or not an object." You need to resolve the error.
What should you do?

A.Replace line 03 with the following line of code.
label.innerText = newText;
B.Replace line 02 with the following line of code.
var label = $get(labelId);
C.Replace line 02 with the following line of code.
var label = Sys.UI.DomElement.getElementById($get(labelId));
D.Replace line 02 with the following line of code.
var label = Sys.UI.DomElement.getElementById($find(labelId));

Answer: B

QUESTION 10
You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5.
You create a Web form by using ASP.NET AJAX.
You write the following client-script code fragment to handle the exceptions thrown from asynchronous postbacks. (Line numbers are included for reference only.)
01
You need to ensure that the application performs the following tasks:
Use a common clien-script function named errorHandler.
Update a Label control that has an ID named lblEror with the error message.
Prevent the browser from displaying any message box or Javascript error What should you do?

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