I have written the below code. But it does not show me the alert message when I don't select the other value and click onto the submit button.
I don't want to use getElementbyId. I am using the name attribute of the HTML.
<HTML>
<HEAD>
<TITLE>ComboBox Validation</TITLE>
<script Language="JavaScript">
function validate()
{
if (document.comboForm.technology.value=="0") \
{
alert("Please Select Technology");
}
}
</script>
</HEAD>
<BODY>
<form name="comboForm">
<select name="technology">
<option value="0">Select</option>
<option value="1">Java Server Pages</option>
</select>
<input type="submit" value="submit" onClick="validate();">
</form>
</BODY>
</HTML>
I think you want:
if (document.forms["comboForm"].technology.value == "0")
But really, stop avoiding document.getElementById. That's the clearest, easiest way to deal with this:
<select id="ddTechnology" name="technology">
<option value="0">Select</option>
<option value="1">Java Server Pages</option>
</select>
if (document.getElementById("ddTechnology").value == "0")
Related
I have this html with javascript, but I don't know why it's not working. It's right now supposed to calculate the values of the two textboxes when the button is pressed. However nothing is happening.
Code:
<!DOCTYPE html>
<html>
<body>
<h1>HTML Räpellys 2</h1>
<select id="mathType">
<option value="0">Addition</option>
<option value="1">Subtraction</option>
<option value="2">Multiplication</option>
<option value="3">Division</option>
<option value="4">Shift Left</option>
<option value="5">Shift Right</option>
<option value="6">Increment</option>
<option value="7">Decrement</option>
<option value="8">AND</option>
<option value="9">OR</option>
<option value="A">XOR</option>
</select>
<p></p>
<form>
Value 1: <input type="text" id="val1" value=""></input>
<p></p>
Value 2: <input type="text" id="val2" value=""></input>
</form>
<p></p>
<button onclick="mathFunc">Calculate!</button>
<p></p>
<script>
function mathFunc() {
var box1 = document.getElementById("val1").value;
var box2 = document.getElementById("val2").value;
if (document.getElementById("mathType").value == 0) {
document.write(box1 + box2);
}
}
</script>
<noscript>Java is required to display this element!</noscript>
</body>
</html>
The issue is that the function should be called on click: onclick="mathFunc()".
Generally, I would recommend you not to use document.write in the code but for debugging purposes use browser console and console.log function.
MDN: https://developer.mozilla.org/en/docs/Debugging_JavaScript#Console.log_in_Browser_Console
the <form> tag should contain the form elements...
eg
<form>
<select...
then I'd also make sure I don't get the string value of the input fields byt wrapping them with parseFloat(). eg:
var box1 = parseFloat( document.getElementById("val1").value ) ;
you also need to call the function as a function, basically what VisioN said above:
onclick="mathFunc()"
I know this is simple, and I need to search in Google. I tried my best and I could not find a better solution. I have a form field, which takes some input and a select field, which has some values. It also has "Other" value.
What I want is:
If the user selects the 'Other' option, a text field to specify that 'Other' should be displayed. When a user selects another option (than 'Other') I want to hide it again. How can I perform that using JQuery?
This is my JSP code
<label for="db">Choose type</label>
<select name="dbType" id=dbType">
<option>Choose Database Type</option>
<option value="oracle">Oracle</option>
<option value="mssql">MS SQL</option>
<option value="mysql">MySQL</option>
<option value="other">Other</option>
</select>
<div id="otherType" style="display:none;">
<label for="specify">Specify</label>
<input type="text" name="specify" placeholder="Specify Databse Type"/>
</div>
Now I want to show the DIV tag**(id="otherType")** only when the user selects Other.
I want to try JQuery. This is the code I tried
<script type="text/javascript"
src="jquery-ui-1.10.0/tests/jquery-1.9.0.js"></script>
<script src="jquery-ui-1.10.0/ui/jquery-ui.js"></script>
<script>
$('#dbType').change(function(){
selection = $('this').value();
switch(selection)
{
case 'other':
$('#otherType').show();
break;
case 'default':
$('#otherType').hide();
break;
}
});
</script>
But I am not able to get this. What should I do? Thanks
You have a few issues with your code:
you are missing an open quote on the id of the select element, so: <select name="dbType" id=dbType">
should be <select name="dbType" id="dbType">
$('this') should be $(this): there is no need for the quotes inside the paranthesis.
use .val() instead of .value() when you want to retrieve the value of an option
when u initialize "selection" do it with a var in front of it, unless you already have done it at the beggining of the function
try this:
$('#dbType').on('change',function(){
if( $(this).val()==="other"){
$("#otherType").show()
}
else{
$("#otherType").hide()
}
});
http://jsfiddle.net/ks6cv/
UPDATE for use with switch:
$('#dbType').on('change',function(){
var selection = $(this).val();
switch(selection){
case "other":
$("#otherType").show()
break;
default:
$("#otherType").hide()
}
});
UPDATE with links for jQuery and jQuery-UI:
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js" ></script>
<script src="//ajax.googleapis.com/ajax/libs/jqueryui/1.10.2/jquery-ui.min.js"></script>
Demo on JSFiddle
$(document).ready(function () {
toggleFields(); // call this first so we start out with the correct visibility depending on the selected form values
// this will call our toggleFields function every time the selection value of our other field changes
$("#dbType").change(function () {
toggleFields();
});
});
// this toggles the visibility of other server
function toggleFields() {
if ($("#dbType").val() === "other")
$("#otherServer").show();
else
$("#otherServer").hide();
}
HTML:
<p>Choose type</p>
<p>Server:
<select id="dbType" name="dbType">
<option>Choose Database Type</option>
<option value="oracle">Oracle</option>
<option value="mssql">MS SQL</option>
<option value="mysql">MySQL</option>
<option value="other">Other</option>
</select>
</p>
<div id="otherServer">
<p>Server:
<input type="text" name="server_name" />
</p>
<p>Port:
<input type="text" name="port_no" />
</p>
</div>
<p align="center">
<input type="submit" value="Submit!" />
</p>
You have to use val() instead of value() and you have missed starting quote id=dbType" should be id="dbType"
Live Demo
Change
selection = $('this').value();
To
selection = $(this).val();
or
selection = this.value;
I got its answer. Here is my code
<label for="db">Choose type</label>
<select name="dbType" id=dbType">
<option>Choose Database Type</option>
<option value="oracle">Oracle</option>
<option value="mssql">MS SQL</option>
<option value="mysql">MySQL</option>
<option value="other">Other</option>
</select>
<div id="other" class="selectDBType" style="display:none;">
<label for="specify">Specify</label>
<input type="text" name="specify" placeholder="Specify Databse Type"/>
</div>
And my script is
$(function() {
$('#dbType').change(function() {
$('.selectDBType').slideUp("slow");
$('#' + $(this).val()).slideDown("slow");
});
});
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
function myfun(){
$(document).ready(function(){
$("#select").click(
function(){
var data=$("#select").val();
$("#disp").val(data);
});
});
}
</script>
</head>
<body>
<p>id <input type="text" name="user" id="disp"></p>
<select id="select" onclick="myfun()">
<option name="1"value="1">first</option>
<option name="2"value="2">second</option>
</select>
</body>
</html>
$('#dbType').change(function(){
var selection = $(this).val();
if(selection == 'other')
{
$('#otherType').show();
}
else
{
$('#otherType').hide();
}
});
I have tried to get it to work but I simply can't find the mistake. Also I have no idea how to make the selection which you have not selected to turn red or some color to alert you.
<!DOCTYPE html>
<html>
<body>
<select id='Selection' name='Selection'>
<option value=''>Select</option>
<option value='1'>user1</option>
<option value='2'>user2</option>
<option value='3'>user3</option>
</select>
<br>
<select id='Candidate' name='Candidate'>
<option value=''>Select</option>
<option value='1'>candidate1</option>
<option value='2'>candidate2</option>
<option value='3'>candidate3</option>
</select>
<br>
<input type='button' onclick='Validate()' value='select' />
<script>
function Validate()
{
if(document.getElementById('Selection').value == '' ||
document.getElementById('Candidate').value == '' ||)
{
alert('Please complete all selections');
return false;
}
return true;
}
</script>
</body>
</html>
You have an extra || in you if condition, this will cause a syntax error, remove it (the last one not both). To change the element that has an invalid value you can just use css but you'll have to check them individually.
i am trying to find a way to allow a user to click items in a combo box and have its value populate an input field and also alert "work stop" or "work start" message when appropriate option is selected. But my code is not working. Please Help!
Here is my code:
<html>
<head>
</head>
<body>
<form>
<select name="sel1" onChange="populateField(this.form)" >
<option value="">---Select---</option>
<option value="stop" >Stop</option>
<option value="start">Start</option>
</select>
<input type="text" id="eStop" name="eStop" />
</form>
<script type="text/javascript">
function populateField(frm){
test = frm.stop.value;
alert('work' test);
frm.eStop.value = test;
}
</script>
</body>
</html>
Thanks in Advance
http://jsfiddle.net/snHQY/
<form>
<select name="sel1" id="select" onchange="populateField();" >
<option value="">---Select---</option>
<option name="stop" value="stop" >Stop</option>
<option name="start" value="start">Start</option>
</select>
<input type="text" id="eStop" name="eStop" />
</form>
<script>
function populateField() {
test = document.getElementById('select').value;
alert(test);
document.getElementById('eStop').value = test;
}
</script>
You can do it using the selectedIndex if you want as well,
<form>
<select name="sel1" id="select" onchange="populateField(this);" >
<option value="">---Select---</option>
<option name="stop" value="stop" >Stop</option>
<option name="start" value="start">Start</option>
</select>
<input type="text" id="eStop" name="eStop" />
</form>
<script>
function populateField(sel) {
sel.form.eStop.value = 'work ' + (sel.selectedIndex == 1 ? 'Stop' : 'Start');
}
</script>
http://jsfiddle.net/cnpuM/
Your code has two errors. You can not reference an element by its value like this test = frm.stop.value; instead use test = frm.sel1.value; . Another error is in this line alert('work' test);. Here you are joining a string "work" with a variable "test". In java script where ever you join two or more variables or strings and variables you alway have to join them with + sign like this:alert('work ' + test);. Remaining code is ok:
<html>
<head>
</head>
<body>
<form>
<select name="sel1" onChange="populateField(this.form)" >
<option value="">---Select---</option>
<option value="stop" >Stop</option>
<option value="start">Start</option>
</select>
<input type="text" id="eStop" name="eStop" />
</form>
<script type="text/javascript">
function populateField(frm){
var test = frm.sel1.value;
alert('work '+ test);
frm.eStop.value = test;
}
</script>
</body>
</html>
You can also use selectedIndex property of "sel1" to do the same.
in your select you can add to onchange's and onkeypress to the populateField's function this as the objects reference.
<select name="sel1" onchange="populateField(this)" onkeypress="populateField(this)">
Now you can reference the select from o. to pass the selected value to the alert dialog and the input field.
function populateField(o){
alert("work " + o.value);
// use regular W3C DOM syntax for element referencing the input and populate it with the select objects selected options value
document.getElementById("eStop").value = o.value;
}
I have two Selects with several options in html code:
<select name="t" id="t">
<option value="0">Overall</option>
<option value="1">t_name</option></select>
<select name="m" id="m">
<option value="0">back to Overall</option>
<option value="1">m_some</option></select>
And my question is how to force change value from first Select named "t" to "0" (Overall) only in the case when user chosen value "0" (back to Overall) in second Select named "m"? And submit form at the end.
--EDIT--
Now because of advices I tried do that in this way:
<script>
$(function(){
$('#m, #t').change(function(){
if($('#m').val() == '0')
$('#t').val('0').change();
$('form#myform').submit();
});
});
</script>
And this script submits the form everytime when I change Select "m" or "t", except situation when I change Select "m" to value "0" (script only changes "t" to "0" in correct way without submit). Why?
<html>
<body>
<form name="form1" id="form1">
<select id="t" name="t" onchange="this.form.submit();">
<option value="0">Overall</option>
<option value="1">t_name</option>
</select>
<select name="m" onchange="setposition(this.value)">
<option value="0">back to Overall</option>
<option value="1">m_some</option>
</select>
</form>
</body>
</html>
<script language="javascript" type="text/javascript">
function setposition(svalue) {
if (svalue == "0") {
document.getElementById("t").options[1].selected = true;
}
}
</script>`enter code here`
You should be using ID's as below as they are easier on DOM searching.
<select name="t" id="t" onchange="this.form.submit();">
<option value="0">Overall</option>
<option value="1">t_name</option></select>
<select name="m" id="m" onchange="this.form.submit();">
<option value="0">back to Overall</option>
<option value="1">m_some</option></select>
<script>
$(function(){
$('#m, #t').change(function(){
//don't forget to trigger the change event
if($('#m').val() == '0')
$('#t').val('0').change();
$('form#form_id').submit();
});
});
</script>
You could do something like that:
$(function(){
$('[name="t"],[name="m"]').change(function(){
if($(this).attr('name')=='m') && $(this).val()=='0'){
$('[name="t"]').val('0');
}
$(this).closest('form').submit();
});
});
$('select[name="m"]').change(function() {
if($(this).val() == '0') {
$('select[name="t"]').val('0');
}
});
Besides that, you should use jQuery to set the onchange events instead of doing so via inline JS:
$('select[name="t"], select[name="m"]').change(function() {
$(this).closest('form').submit();
// if you do not need any jquery submit events,
// you can also use this.form.submit();
});
See http://jsfiddle.net/ThiefMaster/NfVQZ/ for a demo.