How to check if a textbox is empty using javascript
I have a jsp page with some TextBoxes. Now I want to fill them with some information and click the submit button. But I need to check whether this TextBox is empty o开发者_如何转开发r not.
How can I do this?
Using regexp: \S will match non whitespace character:anything but not a space, tab or new line. If your string has a single character which is not a space, tab or new line, then it's not empty. Therefore you just need to search for one character: \S
JavaScript:
function checkvalue() {
var mystring = document.getElementById('myString').value;
if(!mystring.match(/\S/)) {
alert ('Empty value is not allowed');
return false;
} else {
alert("correct input");
return true;
}
}
HTML:
<form onsubmit="return checkvalue(this)">
<input name="myString" type="text" value='' id="myString">
<input type="submit" value="check value" />
</form>
Canonical without using frameworks with added trim prototype for older browsers
<html>
<head>
<script type="text/javascript">
// add trim to older IEs
if (!String.trim) {
String.prototype.trim = function() {return this.replace(/^\s+|\s+$/g, "");};
}
window.onload=function() { // onobtrusively adding the submit handler
document.getElementById("form1").onsubmit=function() { // needs an ID
var val = this.textField1.value; // 'this' is the form
if (val==null || val.trim()=="") {
alert('Please enter something');
this.textField1.focus();
return false; // cancel submission
}
return true; // allow submit
}
}
</script>
</head>
<body>
<form id="form1">
<input type="text" name="textField1" value="" /><br/>
<input type="submit" />
</form>
</body>
</html>
Here is the inline version, although not recommended I show it here in case you need to add validation without being able to refactor the code
function validate(theForm) { // passing the form object
var val = theForm.textField1.value;
if (val==null || val.trim()=="") {
alert('Please enter something');
theForm.textField1.focus();
return false; // cancel submission
}
return true; // allow submit
}
passing the form object in (this)
<form onsubmit="return validate(this)">
<input type="text" name="textField1" value="" /><br/>
<input type="submit" />
</form>
Using this JavaScript will help you a lot. Some explanations are given within the code.
<script type="text/javascript">
<!--
function Blank_TextField_Validator()
{
// Check whether the value of the element
// text_name from the form named text_form is null
if (!text_form.text_name.value)
{
// If it is display and alert box
alert("Please fill in the text field.");
// Place the cursor on the field for revision
text_form.text_name.focus();
// return false to stop further processing
return (false);
}
// If text_name is not null continue processing
return (true);
}
-->
</script>
<form name="text_form" method="get" action="#"
onsubmit="return Blank_TextField_Validator()">
<input type="text" name="text_name" >
<input type="submit" value="Submit">
</form>
You can also check it using jQuery.. It's quite easy:
<html>
<head>
<title>jQuery: Check if Textbox is empty</title>
<script type="text/javascript" src="js/jquery_1.7.1_min.js"></script>
</head>
<body>
<form name="form1" method="post" action="">
<label for="city">City:</label>
<input type="text" name="city" id="city">
</form>
<button id="check">Check</button>
<script type="text/javascript">
$('#check').click(function () {
if ($('#city').val() == '') {
alert('Empty!!!');
} else {
alert('Contains: ' + $('#city').val());
}
});
</script>
</body>
</html>
Whatever method you choose is not freeing you from performing the same validation on at the back end.
The most simple way to do it without using javascript is using required=""
<input type="text" ID="txtName" Width="165px" required=""/>
<pre><form name="myform" method="post" enctype="multipart/form-data">
<input type="text" id="name" name="name" />
<input type="submit"/>
</form></pre>
<script language="JavaScript" type="text/javascript">
var frmvalidator = new Validator("myform");
frmvalidator.EnableFocusOnError(false);
frmvalidator.EnableMsgsTogether();
frmvalidator.addValidation("name","req","Plese Enter Name");
</script>
Note: before using the code above you have to add the gen_validatorv31.js file.
加载中,请稍侯......
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