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JavaScript - How Do We Validate An Arithmetic Expression Using Javascript?
How do we validate an arithmetic expression using Javascript?
Similar TutorialsHi i am using this form to validate my input Code: function validateForm() {
var name = document.getElementById("name");
var descp = document.getElementById("descp");
var language = document.getElementById("language");
var txtFileName = document.getElementById("txtFileName");
var alphaNumExp = /^[a-zA-Z0-9 _-]+$/;
var isValid = true;
if ((name.value === "" || name.value.length < 1 || name.value.length > 30) && !name.value.match(alphaNumExp)) {
isValid = false;
}
if ((descp.value === "" || descp.value.length < 1 || descp.value.length > 1000) && !descp.value.match(alphaNumExp)) {
isValid = false;
}
if (language.value === "") {
isValid = false;
}
if (txtFileName.value === "") {
isValid = false;
}
document.getElementById("btnSubmit").disabled = !isValid;
}
for a form. It checks everything else correctly EXCEPT for the alpha numeric part. Any ideas?? I am new to JS writing on my own(just was using other's scripts) Is there a y regular expression which we can use in JavaScript to validate URL? Or any other type of validation to validate URL which has http or https?
Hi, Does anyone know how to make a javascript regex ignore new lines? I have this Code: html = html.replace(/<!--(.*?)-->/gi, ''); // HTML comments which matches single line comments like - Code: <!-- this is a comment --> but not this - Code: <!-- This is a comment on multiple lines --> I think the answer lies with [\s\S] but I can't get it to work e.g. - Code: html = html.replace(/<!--(.*[\s\S]?)-->/gi, ''); // HTML comments Any help will be greatly appreciated Cheers Al hello i am trying to do a validation form but i ended up with one that only works for chrome, not on IE not on Firefox! don't know why!!! and another problem it looks like that the return false doesn't even work, it proceeds to the next page anyway [HTML]function validate_required(field,alerttxt) { with (field) { if (value==null||value=="-1") { alert(alerttxt); return false; } else { return true; } } } /*function alertt(thisform) {alert(thisform);}*/ function validate_form(thisform) { //alert('hi'); with (thisform) { if (validate_required(i_am_a,"i_am_a must be filled out!")=="-1") {i_am_a.focus(); return false;} } [/HTML] [HTML]<form method="post" action="index.php?page=step2" onsubmit="return validate_form(i_am_a.options[i_am_a.selectedIndex].value);"> <table class="text"> <tr> <td class="text">أنا</td> <td> <select name="i_am_a" id="i_am_a"> <!--onchange="validate_form(i_am_a.options[i_am_a.selectedIndex].value);">--> <option selected value="-1">الرجاء التحديد</option> <option value="MSW">رجل يبحث عن إمرأة</option> <option value="WSM">إمرأة تبحث عن رجل</option> </select> </td> </tr><tr class="submit"> <td> </td> <td> <input type="submit" value="إنضمم الآن مجانا" /> </td> </tr> </table> </form>[/HTML] Hello, I have a survey with hundred of input boxes. I want to make a script that will validate all fields not empty and maybe jump to the empty box. I made the validation with php but i'm not so good at javascript (if is possible to validate by input not by input name). Thank in advance. Hi there, I would like to validate the email address typed into the prompt message by the user, but to no avail. Can some kind soul help? Code: function addOption()
{
var new = prompt("Enter New Item:");
if (!new == "")
{
var answer = confirm ("Are you sure you want to add? ")
if (answer)//if answer is true
{
var lst = document.getElementById('lstBx'); // listbox control id
// Now we need to create a new 'option' tag to add to MyListbox
for (var i = 0; i < lst.options.length; i++)
{
arrTexts = lst.options[i].text;
if (arrTexts.toLowerCase() == newItem.toLowerCase())
{
alert ("That email address is already included in the list - please enter another one.");
break;
}
else
{
validRegExp = /^[^@]+@[^@]+.[a-z]{2,}$/i;
strEmail = lst.value;
// search email text for regular exp matches
if (strEmail.search(validRegExp) == -1)
{
alert('A valid e-mail address is required.\nPlease retry.');
return false;
}
var optionNew = document.createElement("option");
optionNew.value = new; // The value that this option will have
optionNew.innerHTML = new; // The displayed text inside of the <option> tags
// Finally, add the new option to the listbox
lst.appendChild(optionNew);
//sort items in listbox in alpha order
arrTexts = new Array();
for(i=0; i<lst.length; i++)
{
arrTexts[i] = lst.options[i].text;
}
arrTexts.sort();
for(i=0; i<lst.length; i++)
{
lst.options[i].text = arrTexts[i];
lst.options[i].value = arrTexts[i];
}
}
return false;
}
}
}
else
{
if(new == "")
{
alert("Key something to textbox please.");
}
else
alert("Cancelled.");
}
}
Code: <select id="lstBx" name="listBox" size="6" style="width: 580px;">
<option>a@hotmail.com</option>
<option>b@hotmail.com</option>
<option>c@yahoo.com</option>
<option>d@gmail.com</option>
<option>e@ymail.com</option>
<option>f@msn.com</option>
</select>
Hello all, I have a form that submits a POST request when data is submitted. A Servlet then processes this POST request and a JavaBean is used to make some calculations. The HTML response is not generated within the Servlet but instead I forward the request to a JSP to generate the response. - This all works fine, thankfully. However, I am stupidly suck trying to validate the form on the client side with a JavaScript function before the form is submitted. Here is my index.jps: Code: <%--
Document : index
Created on : 19-Nov-2009, 13:41:30
Author : lk00043
--%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/JavaScript">
<!-- Start hiding JavaScript Statements
function validateForm() {
var student;
var score1, score2, score3, score4;
student = document.getElementById('student');
s1 = document.getElementById('score1');
s2 = document.getElementById('score2');
s3 = document.getElementById('score3');
s4 = document.getElementById('score4');
score1 = parseInt(s1.value);
score2 = parseInt(s2.value);
score3 = parseInt(s3.value);
score4 = parseInt(s4.value);
if(student.value.length == 0) {
document.getElementById('StudentError1').innerHTML = " Enter a student name!";
return false;
}
if ((isNaN(score1)) || (score1 < 0) || (score1 > 100)) {
document.getElementById('Error1').innerHTML = " Enter a number between 0 and 100!";
return false;
}
if ((isNaN(score2)) || (score2 < 0) || (score2 > 100)) {
document.getElementById('Error2').innerHTML = " Enter a number between 0 and 100!";
return false;
}
if ((isNaN(score3)) || (score3 < 0) || (score3 > 100)) {
document.getElementById('Error3').innerHTML = " Enter a number between 0 and 100!";
return false;
}
if ((isNaN(score4)) || (score4 < 0) || (score4 > 100)) {
document.getElementById('Error4').innerHTML = " Enter a number between 0 and 100!";
return false;
}
}
// End hiding JavaScript Statements -->
</script>
<title>Lab Class 7 - Task 2</title>
</head>
<body>
<h1>Lab Class 7</h1>
<form name="collectgrades" action="AssessGrades" method="POST" onSubmit="validateForm()" >
Name of Student: <input type="text" name="student" id="student"/><span id="StudentError1"> </span><br />
Presentation: <input type="text" name="score" id="score1"/><span id="Error1"> </span><br />
Writing style: <input type="text" name="score" id="score2"/><span id="Error2"> </span><br />
Technical content: <input type="text" name="score" id="score3"/><span id="Error3"> </span><br />
Depth of analysis: <input type="text" name="score" id="score4"/><span id="Error4"> </span><br />
Feedback:<select name="feedback" size="4" multiple="multiple">
<option>"Could be better structured."</option>
<option>"Depth of analysis is good."</option>
<option>"Very advanced material."</option>
<option>"Very well structured."</option>
</select><br />
<input type="submit" value="Submit" />
</form>
</body>
</html>
Regardless of whether incorrect input is given, the data is still POSTed to the server and calculated on or a Server Side error is given. Am I correct in calling the function onClick? The validation essentially needs to be so that: - Student field contains a string - Score1, Score2, Score3 and Score 4 contain a number between 0 and 100 Any help is most appreciated, Cheers, Beetle. hiiii, im new to javascripts . Can anyone help me to know that a javascript which is validating a phone number accepts only digits but if the text field is left empty it should accept the entry as an empty entry.... plz share knowledge u will be more knowledgeable I am trying to change the background color of TD's that only the exact text PTO and really do not grasp regex's string/element examples: Code: <td class="ms-cal-todayitem"> Ward, Daniel M. - PTO - home - im awesome. </td> <td class="ms-cal-todayitem">Ward, Daniel M. - UPTO - home - im awesome. </td> I tried this: Code: $("td.ms-cal-todayitem").filter(function() {
return /PTO/.test( $(this).text() );
}).css("background-color","#C4DBFF")
but it also changes the background of items like my second element example. - Yes it should be case sensitive, if possible. Hi all, I have this line (part of a larger function that converts a few common BBCodes into HTML) and I don't know how to do one thing. First, here's the line: Code: str.replace(/\[color=(.*?)\](.*?)\[\/color\]/gi,'<span style="color:$1;">$2</span>'); It works fine if I do this (I'll mis-spell "color" to prevent messing up the board): THIS works fine..... [colur=#ff0000]Red Text[/colur] But of course, if I do this: [colur="#ff0000"]Red Text[/colur] It doesn't work. What I need to do is take the $1 variable, AFTER it's captured, but BEFORE it's used, and strip out any quote marks I find. I may want to also strip out, then add the hash sign (#) also, then put it back so it works with or without the #. While I'm at it, I'll also probably detect color as a hex string vs. a keyword (so that both "#ff0000" and "red" work) and probably also support the rgb() method. But first I need to know how to access and modify $1 BEFORE it's used. I'm hoping that I don't need to use two lines (or two separate .replace() calls). Thanks! -- Roger Hi: I think this is where I need to ask this. I am doing a PHP/mod_rewrite and I need to tweak one of the RegEx's used in it but I don't know the syntax. I have this bit of code: Code: <a href="http://www.mywebsite.com/Promotional.Products-Promotional.Items/Promotional-Products/<?php echo $product_id ?>-<?php echo str_replace(" ", "-", $myTitle) ?>-<?php echo $full_state ?>-Promotional-Products.html" title="<?php echo $myTitle?> <?php echo "$full_state"; ?>"><?php echo $myTitle?></a>
RewriteRule ^Promotional.Products-Promotional.Items/Promotional-Products/([0-9]+)-([a-zA-Z]+)-([a-zA-Z]+)-Promotional-Products.html$ Promotional.Products-Promotional.Items/Promotional-Products.php?product_id=$1&myTitle=$2&full_state=$3
I wanted to know how I can revise the middle RegEx: Code: ...-([a-zA-Z]+)-... to include replacing all spaces with hyphens. Can someone help me with this, please. Thanks! for the character classes [ ] , if i want to match ,.[] i cannot put them into the square brackets so how to deal with that? what if the characters are . or ! or ." (<-- combined) it fails if the regexp is [.!(.")] which will treat ( as one of the element. also the book javascript: the definitive guide says that (?=p) requires that the following characters match the pattern p, but do not include those characters in the match. However, the browser failed to figure this out (IE8) i.e. "asd:ert".match(/(?=\\w/) returns null thx in advance Dear experts I have following codes Var re=/(\d){4}-(\d){7}/; When I test this string 0300-685706263 It says TRUE But I validate this string exactly 0300-6857062 Please help I am trying to find the correct regular expression (or an alternate) for if a user enter any more than 1-3 digits in the age field of a form it produces an error message. I already have the error set up, just the correct coding to produce the 1-3 digit condition. Thanks, KWIKCUCUMBER. Hi, Can someone fix the following regular expression? It is validating every thing expect YEAR. It only matches first 2 digits for year instead of 4. I want it to be 4 digits for a year. It returns true if I put 12/25/19.I want it to return false for the above date. Code: var RegExPattern = /^(?=\d)(?:(?:(?:(?:(?:0?[13578]|1[02])(\/|-|\.)31)\1|(?:(?:0?[1,3-9]|1[0-2])(\/|-|\.)(?:29|30)\2))(?:(?:1[6-9]|[2-9]\d)?\d{2})|(?:0?2(\/|-|\.)29\3(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))|(?:(?:0?[1-9])|(?:1[0-2]))(\/|-|\.)(?:0?[1-9]|1\d|2[0-8])\4(?:(?:1[6-9]|[2-9]\d)?\d{2}))($|\ (?=\d)))?(((0?[1-9]|1[012])(:[0-5]\d){0,2}(\ [AP]M))|([01]\d|2[0-3])(:[0-5]\d){1,2})?$/;
Thanks Hello, How can i validate string with alphanumeric, space, dash and dot in regular expression ? I want to validate a form with only numbers and "$" sign. so far i know this Code: currencyValue = which.value;
var re = /^[0-9]*$/;
if (!re.test(currencyValue)) {
alert("Value must be all numberic charcters, non numeric's removed from field!");
field.value = field.value.replace(/D/g,"");
}
but how do I also add the "$" sign as ok? I want to find in all occurrences of #(...) in a string (what is between the parentheses is unknown. At the moment I have Code: str.match(/#\(.*\)/) The problem is, I want to be able to have multiple of these in one string, like "#(hello) good #(world)", but RegExp takes me from the first '#', to the last ')'. I want to allow nested parentheses, so I am thinking that there should be away to not let it look past the second '#'. How would I do this? I have the following regular expression to test the validity of an input date: Code: ([0-9][0-9]|[0-9])[\s/-]([0-9][0-9]|[0-9])[\s/-]([0-9][0-9][0-9][0-9]|[0-9][0-9]) It should allow 1 or two digits for the day of the month, then a separating character (" ", "/" or "-"), then 1 or two digits for the month, then 2 or 4 digits for the year. Unfortunately it will accept anything above 2 digits for the year, which I understand why is happening but don't know how to fix! Can anyone help? Thanks! |
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