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POHow to correctly validate in jquery for a empty text input
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2012-12-05T03:48:38.653
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2012-12-05T07:30:14.813
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<p>This is my jQuery code to validate a html table:</p> <pre><code>function validation() { var alertValidation = ""; var _qid = ""; var _msg = ""; $("[class*='q']").each(function (i) { var questions = parseInt($("[class*=q" + i + "_qnum]").text()); var marks = parseInt($("[class*=q" + i + "_ans_text]").text()); var txtinput = $("[class*=q" + i + "_mark]").val(); _qid = questions; _msg = "You have errors on Question Number: " + _qid + "\n"; if (txtinput == '' || txtinput == null) { alertValidation += "\n\u2022 You have not entered in a value for all the Indivdiaul Marks textbox\n"; } else if (marks < '0') { alertValidation = "Your Total Marks Remaining does not equal 0 \n\n\u2022 You Need To Remove " + Math.abs(marks) + " Marks"; } else if (marks > '0') { alertValidation = "Your Total Marks Remaining does not equal 0 \n\n\u2022 You Have " + marks + " Marks Remaining"; } if (alertValidation != "") { return false; //Stop the each loop } }); if (alertValidation != "") { alert(_msg + alertValidation); return false; } return true; } </code></pre> <p>Now what I find strange is that if the validation for when the number of marks remaining is higher than 0 and the validation for when the number of marks remainig is lower than 0 works perfectly when the alert is outputted as it displays this below:</p> <p><strong>Higher than 0:</strong></p> <pre><code>You have errors on Question Number: 1 Your Total Marks Remaining does not equal 0 • You Have 7 Marks Remaining </code></pre> <p><strong>Less than 0:</strong></p> <pre><code>You have errors on Question Number: 1 Your Total Marks Remaining does not equal 0 • You Need To Remove 3 Marks </code></pre> <p>But when I try to validate to see if a text input under the "Marks per Answer" section is empty, then it displays this message below:</p> <pre><code>You have errors on Question Number: NaN • You have not entered in a value for all the Indivdiaul Marks textbox </code></pre> <p>Why can't it display the question number for this validation?</p> <p>Also another slight problem I have is that even if I have entered in a value in all the text inputs under "Marks per Answer", it still displays the above validation message alert when it shouldn't do. Why does it do this as well?</p> <p>Below is an example html table:</p> <pre><code><table border='1' id='markstbl'> <thead> <tr> <th class='questionth'>Question No.</th> <th class='answermarksth'>Marks per Answer</th> <th class='noofmarksth'>Marks Remaining</th> </tr> </thead> <tbody> <tr class="questiontd"> <td class="questionnumtd q<?php echo$questionId?>_qnum" name="numQuestion" rowspan="1">1 <input type="hidden" name="q1_ans_org" class="q1_ans_org" value="5"><input type="hidden" name="q1_ans" class="q1_ans" value="5"></td> <td class="answermarkstd"> <input class="individualMarks q1_mark" q_group="1" name="answerMarks[]" class="individualtext" type="text" onkeypress="return isNumberKey(event)" maxlength="3" /> </td> <td class="noofmarkstd q1_ans_text" q_group="1" rowspan="1"><strong>5</strong></td> </tr> </tbody> </table> </code></pre>
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How to correctly validate in jquery for a empty text input
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