As shown below:
The source code is as follows:
</ title> <br><script type="text/javascript"> <br>//Perform data validation<br>function ValidateForm() { <br>var booknamelist = document.getElementsByName("BookName"); <br>var bookversionlist = document.getElementsByName("Version"); <br>var booknumlist = document.getElementsByName("BookNum"); <br>for (var i = 0; i < booknamelist.length; i ) { <BR>var bookname = booknamelist[i].value; <BR>var bookversion = bookversionlist[i].value; <BR>var booknum = booknumlist[i].value; <BR>if (bookname == "") { <BR>alert("The" (i 1) "The book name of the row cannot be empty!"); <BR>return false; <BR>} <BR>if (bookversion == "") { <BR>alert( "The" (i 1) "The book version of the row cannot be empty!"); <BR>return false; <BR>} <BR>if (booknum == "") { <BR>alert("the" ( i 1) "The number of books in the row cannot be empty!"); <BR>return false; <BR>} <BR>if (isNaN(booknum)) { <BR>alert("th" (i 1) "row The number of books entered is incorrect! "); <BR>return false; <BR>} <BR>} <BR>return true; <BR>} <BR>var rowNum = 2; <BR>//Add a row<BR>function AddRow() { <BR>var myTable = document.getElementByIdx_x("myTable"); <BR>var newTr = myTable.insertRow(rowNum); <BR>var newTd1 = newTr.insertCell(0); <BR>newTd1.setAttribute("align ", "center"); <BR>newTd1.innerHTML = '<input type="text" name="BookName" style="width:200px">'; <br>var newTd2 = newTr.insertCell(1 ); <br>newTd2.setAttribute("align", "center"); <br>newTd2.innerHTML = '<input type="text" name="Version" style="width: 120px" />' ; <br>var newTd3 = newTr.insertCell(2); <br>newTd3.setAttribute("align", "center"); <br>newTd3.innerHTML = '<input type="text" name="BookNum " style="width: 56px" />'; <br>var newTd4 = newTr.insertCell(3); <br>newTd4.setAttribute("align", "center"); <br>newTd4.innerHTML = ' <input type="text" name="BookAuthor" style="width: 70px" />'; <br>var newTd5 = newTr.insertCell(4); <br>newTd5.setAttribute("align", " center"); <br>newTd5.innerHTML = '<input type="text" name="BookPress" style="width: 102px" />'; <br>rowNum ; <br>} <br>/ /Delete the last row<br>function DeleteRow() { <br>var myTable = document.getElementByIdx_x("myTable"); <br>if (rowNum > 1) { <br>myTable.deleteRow(rowNum-1); <br>rowNum--; <br>} <br>} <br></script> <br></head> <br><body> <br><table id="myTable" cellspacing ="0px" cellpadding="2px" width="700px"> <br><tr> <br><td align="center" style="color: #006699; font-weight: bold;"> ; <BR>Book name<BR></td> <br><td align="center" style="color: #006699; font-weight: bold;"> <br>Version<br>< ;/td> <br><td align="center" style="color: #006699; font-weight: bold;"> <br>Quantity (this) <br></td> <br> <td align="center" style="color: #006699; font-weight: bold;"> <br>Book Author<br></td> <br><td align="center" style ="color: #006699; font-weight: bold;"> <br>Publishing Company<br></td> <br></tr> <br><tr> <br><td align="center"> <br><input name="BookName" type="text" style="width: 200px" /> <br></td> <br><td align=" center"> <br><input type="text" name="Version" style="width: 120px" /> <br></td> <br><td align="center"> ; <BR><input type="text" name="BookNum" style="width: 56px" /> <br></td> <br><td align="center"> <br><input type="text" name="BookAuthor" style="width: 70px" /> <br></td> <br><td align="center"> <br>< input type="text" name="BookPress" style="width: 102px" /> <br></td> <br></tr> <br></table> <br>< div> <br><input type="button" value="Add book" onclick="AddRow()" /><input type="button" value="Delete book" <BR>onclick="DeleteRow ()" /><input type="button" value="Submit" onclick="ValidateForm()" /></div> <br></body> <br></html> <br>
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