Line 1 denotes that this is the start of a script, that the programming language is in Visual C#.NET

Generator QR in Visual C#.NET Line 1 denotes that this is the start of a script, that the programming language is

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The Web page shown in Figure 32-9 contains two scripts:
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One script updates the text box whenever the Web visitor moves the slider. The other script moves the slider whenever the Web visitor changes the value in the text
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box. The following script updates the text box whenever the Web visitor moves the slider. This script can appear almost anywhere in the Web page, but somewhere in the <head> section is probably best.
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1 2 3 4 5 <script LANGUAGE="JavaScript" FOR="Slider1" EVENT="Change"> if (navigator.appName.substring(0,9) == "Microsoft") { form1.qty.value = Slider1.value } </script>
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41, Working with Script Code, provides an overview of script code, but here are the details for this example:
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Line 1 denotes that this is the start of a script, that the programming language is
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JavaScript, that the script pertains to the Slider1 element, and that the script should run whenever any property of the Slider1 element changes.
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Line 2 verifies that the browser is Internet Explorer. If the browser is Internet Explorer, line 3 copies the value property of the Slider1
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ActiveX control into the value property of the text box. The name of the text box is qty, a fact you could confirm by double-clicking the text box in Design view and inspecting the Name box in the Text Box Properties dialog box. The name of the form is form1, which you could verify by right-clicking anywhere in the form, choosing Form Properties from the shortcut menu, and again checking the Name box.
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Line 4 terminates the range of the if statement begun on line 2. Line 5 marks the end of the script.
The script that updates the slider control whenever the Web visitor updates the text box is slightly more complicated. It starts with the following line, which is the HTML for the text box itself:
<input type="text" name="qty" size="10" onChange="qtyChange(qty.value)">
Part 8: Incorporating Advanced Content
Using ActiveX Controls and Java Applets The onChange attribute in this tag specifies a single JavaScript statement that executes whenever the value of the text box changes. As coded, that statement calls a function named qtyChange and passes the new value qty.value as an argument. Here s the code for this function:
1 2 3 4 5 6 7 8 9 10 11 <script> function qtyChange(aqty){ if (isNaN(aqty)) { alert("Quantity " + aqty + " is invalid,") }else{ if (navigator.appName.substring(0,9) == "Microsoft") { form1.Slider1.value = aqty; } } } </script>
Line 1 marks the beginning of a block of script code. The default language is JavaScript. Line 2 marks the beginning of the qtyChange function. The function takes one argu
ment, named aqty.
The isNaN function in line 3 returns true if aqty is not a number. (isNaN is is not a
number, get it )
If aqty is not a number, line 4 displays an error message. Otherwise, aqty must be a number, and: Line 6 verifies that the browser is Internet Explorer. Line 7 copies the aqty value into the Slider1 control. Line 8 terminates the range of the if statement begun on line 6. The remaining lines close out the first if statement, the function definition, and the
block of script code. Submitting the form requests a Web page named sliderqty.asp from the Web server. This is an ASP page containing script code that runs on the Web server as well as ordinary HTML code. The inner workings of ASP is beyond the scope of this discussion, but at a high level, the sliderqty.asp page retrieves the values submitted with the HTML form and adds them to the outgoing Web page for display. Figure 32-10 shows a typical result.
For more information about ASP, refer to Appendix J, Processing Form Data with ASP and ASP.NET Pages.
To view this page in FrontPage, open the sample Web site you installed from the companion CD, and then open ch32/slider.htm.
Part 8: Incorporating Advanced Content
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Part 8: Incorporating Advanced Content
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Figure 32-10. Submitting the HTML form shown in Figure 32-9 produces a Web page that incorporates the specified value.
To actually submit the form and see the results shown in Figure 32-10, you must satisfy all of the following requirements:
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