Can someone assist me with validating a textbox to only allow specific characters and prevent input after the limit is reached? I know it can be done using Javascript but I'm not sure how to do it. Any help would be greatly appreciated.
Can someone assist me with validating a textbox to only allow specific characters and prevent input after the limit is reached? I know it can be done using Javascript but I'm not sure how to do it. Any help would be greatly appreciated.
Below are 2 different methods to limit character count in a text input field: 1) Using a JavaScript function called 'TextLimit' that restricts the number of characters entered into the textbox. 2) Utilizing the 'maxlength' attribute which sets the maximum allowed length (in characters) for an input field.
<HTML>
<HEAD>
<TITLE>Test</TITLE>
<script>
function TextLimit(){
var text = document.getElementById('myinput');
if (text.value.length > 10){
alert('You exceeded the limit');
text.value = text.value.substring(0,10);
}
}
</script>
</HEAD>
<BODY>
<input name="myinput" type="text" value='' id="myinput" onkeyup="TextLimit()">
<br>
//this is using the maxlength attribute of textbox
<input type="text" name="inputtext" maxlength="10">
</BODY>
</HTML>
When it comes to Single Line textboxes, they will automatically adhere to the maxLength attribute specified.
CreativeWebsite.com offers a handy JavaScript script that ensures max length on multiline text by cutting off any input exceeding the set limit.
If you want to apply mandatory attributes to each control, one approach is to override the render method of the control.
Another option is using a RegularExpressionValidator:
RegularExpressionValidator regexValidator = new RegularExpressionValidator();
if (this.MaxLength > 0)
{
regexValidator.ValidationExpression = ".{0," + <textbox>.MaxLength + "}";
}
else
{
regexValidator.ValidationExpression = ".*";
}
If you're interested, consider using jQuery - numeric in conjunction with maxLength (although keep in mind that it may not work on all versions of Firefox).
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