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javascript onkeypress limit characters when pasting


By : Marshal Kumar
Date : October 18 2020, 06:10 AM
wish helps you what's the problem with using maxlength?
I tried it and it works for me:
code :
<template>
     <textarea name="description" maxlength.bind="max" value.bind="desc"></textarea>
</template>
export class Test {
  max = 3;
}


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How can I validate the text-box for restricting the input for characters only in onkeypress event in Javascript


By : user2827558
Date : March 29 2020, 07:55 AM
help you fix your problem I have placed one textbox.... I want to put restriction on it .. , Assuming you have an input with id of "test"
code :
<input type="text" id="test" />
function handleKeyPress(e) {
    var restricted = "0123456789_#!";
    var key = e.keyCode || e.which;
    var i=0;
    for(;i<restricted.length;i++) {
        if (restricted.charCodeAt(i) == key) {
            e.returnValue = false;
        }
    }
}

document.getElementById("test").addEventListener("keypress", handleKeyPress, true);

Pasting instead of typing text into input field with character limit javascript


By : jimmy Ruan
Date : March 29 2020, 07:55 AM
will be helpful for those in need I have code that limits number of characters with a sort of "countdown" field that works in real-time as the user types. , Try the maxlength property:
code :
<input type="text" maxlength="10">

javascript prevent copy/pasting beyond character limit in textarea


By : Sujatha
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Listen for the onpaste event. Once the event fires, grab the text from the clipboard and manipulate it how you like.
HTML
code :
<textarea id="test" maxlength="10" class="maxtext"></textarea>
var test = document.getElementById("test");

test.onpaste = function(e){
    //do some IE browser checking for e
    var max = test.getAttribute("maxlength");
    e.clipboardData.getData('text/plain').slice(0, max);
};

javascript limit on positive and negative number with delimiter comma based onkeyup and onkeypress


By : Harsh Tekwani
Date : March 29 2020, 07:55 AM
it fixes the issue This is not the best solution, but you can implement this according to your need.
code :
 

 var msg = document.getElementById('myInputBox'),
    numberPattern = /^[0-9]+$/;

msg.addEventListener('keyup', function(e) {
    msg.value = getFormattedData(msg.value);
});

function checkNumeric(str) {
    return str.replace(/\,/g, '');
}
Number.prototype.format = function() {
    return this.toString().replace(/(\d)(?=(\d{3})+(?!\d))/g, "$1,");
};

function getFormattedData(num) {
	var i = checkNumeric(num),
    	isNegative = checkNumeric(num) < 0,
        val;
        
    if (num.indexOf('.') > -1) {
        return num;
    }
    else if (num[num.length - 1] === ',') {
    	return num;
    }
    else if(i.length < 3) {
    	 return i;
    }else {
    	val = Number(i.replace(/[^\d]+/g, ''));
    }
    
    return (isNegative ? '-' : '') + val.format();
}
<input type="text" id='myInputBox' value="" />

Regex Javascript escape special characters plus characters limit


By : Matthew Adler
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Can anyone help me with this regex? I need something which allow: 0-9 a-z A-Z spaces commas hyphens apostrophes and these other special characters: _@=.` plus at the same time set characters limit into it. , Remove + after {1,35} and escape only special characters:
code :
var regex = /^\s*([0-9a-zA-Z\s,\-()'_@~&*=.`]{1,35})\s*$/;

console.log(regex.test(" asdfghjkl "))
console.log(regex.test(" asdf'&@() "))
console.log(regex.test(" asdfghjklasdfghjklasdfghjklasdfghjklasdfghjkl "))
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