JavaScript Examples Bible - UserWorks Technologies

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onChange Chapter 9 ✦ Text-Related Form Objects (Chapter 25) NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ Example Whenever a user makes a change to the text in a field in Listing 25-6 and then either tabs or clicks out of the field, the change event is sent to that field, triggering the onChange event handler. Because the form in Listing 25-6 has only one field, the example demonstrates a technique you can use that prevents a form from being “submitted” if the user accidentally presses the Enter key. The technique is as simple as defeating the submission via the onSubmit event handler of the form. At the same time, the onSubmit event handler invokes the checkIt() function, so that pressing the Enter key (as well as pressing Tab or clicking outside the field) triggers the function. Listing 25-6: Data Validation via an onChange event Handler Text Object Select/Focus // general purpose function to see if a suspected numeric input is a number function isNumber(inputStr) { for (var i = 0; i < inputStr.length; i++) { var oneChar = inputStr.substring(i, i + 1) if (oneChar < “0” || oneChar > “9”) { alert(“Please make sure entries are numbers only.”) return false } } return true } function checkIt(form) { inputStr = form.numeric.value if (isNumber(inputStr)) { // statements if true } else { form.numeric.focus() form.numeric.select() } } Continued 367 document.formObject.textObject.onChange
368 JavaScript Examples Bible: The Essential Companion to JavaScript Bible Listing 25-6 (continued) Enter any positive integer: TEXTAREA Element Object Properties cols rows NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility ✓ ✓ ✓ ✓ Example Use The Evaluator to play with the cols and rows property settings for the Results textarea on that page. Shrink the width of the textarea by entering the following statement into the top text box: document.forms[0].output.cols = 30 And make the textarea one row deeper: document.forms[0].output.rows++ Methods createTextRange() NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility ✓ ✓ ✓ Example See the example for the TextRange.move() method in Chapter 5 of this book to see how to control the text insertion pointer inside a TEXTAREA element. TEXTAREA.createTextRange () ✦ ✦ ✦
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100% ONE HUNDRED PERCENT COMPREHENS
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“An excellent book that builds so
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JavaScript Examples Bible: The Ess
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About the Author Danny Goodman is t
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Preface Acommon thread running thro
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Preface Listing numbers are derived
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Acknowledgments Because most of the
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Contents Preface. . . . . . . . . .
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Contents Chapter 7: The Form and Re
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Contents Chapter 15: The NN4 Layer
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192 FRAME.scrolling JavaScript Exam
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196 FRAMESET.cols JavaScript Exampl
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198 IFRAME.align JavaScript Example
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200 IFRAME.src JavaScript Examples
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234 document.height JavaScript Exam
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236 document.layers JavaScript Exam
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254 document.write() JavaScript Exa
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Body Text Objects (Chapter 19) The
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Note Chapter 5 ✦ Body Text Object
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Chapter 5 ✦ Body Text Objects (Ch
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width Chapter 5 ✦ Body Text Objec
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commonAncestorContainer Chapter 5
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Methods cloneContents() cloneRange(
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extractContents() Chapter 5 ✦ Bod
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var count = form.deleteCount.value
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inRange(otherRangeRef) Chapter 5
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TextRectangle Object Properties bot
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Chapter 13 ✦ Event Objects (Chapt
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Figure 13-2: Clicking on one SPAN e
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clientX clientY layerX layerY pageX
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eventPhase Chapter 13 ✦ Event Obj
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440 ruleObject.style JavaScript Exa
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String and Number Objects (Chapters
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Parsing methods string.charAt(index
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488 array.concat() JavaScript Examp
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492 array.reverse() JavaScript Exam
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494 array.sort() JavaScript Example
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What’s on the CD-ROM The accompan
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A above property, 442-443 accessKey
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set to empty, 11 working with, 12 c
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location property, 238-240 methods,
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frames border, 197-198, 199 control
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onDragStart event handler, 103, 108
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insertBefore() method compatibility
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go(), 221-222 hasChildNodes(), 74-7
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NN4 layer object above property, 44
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onSelectStart event handler compati
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frame, 385-387 FRAME element object
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protocol property, 213 document obj
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text property BODY element object,
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X x property IE4+ event object, 413
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4. Restrictions on Use of Individua
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CD-ROM Installation Instructions Th
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