to alert user if user enters other than a valid number value in each text fields and to alert user enter number if any t

» javascript » to alert user if user enters other than a valid number value in each text fields and to alert user enter number if any t

By : user2956183

Date : November 22 2020, 10:54 AM

I think the issue was by ths following , , Try below code:

code :

 <!DOCTYPE html>
 <html>
 <body bgcolor = "eeeeee">
 <p> Add Section </p>
 <label>Fir No :</label>
 <input id="txt1"  type="text"/></br></br>
 <label>Sec No :</label>
 <input id="txt2"  type="text"/></br></br>
 <input type="button" name="Add" value="Add" onclick="addTwoNumber()"/>
 <p id="demo"></p>
 <script>
 function myFunction() {
 document.getElementById("demo").innerHTML = Date();
 }
 <!-- addition of two numbers-->

 function addTwoNumber(){
 var a = document.getElementById("txt1").value;
 var b = document.getElementById("txt2").value;
 if (a == "" || b == "")
 {
    alert('Please enter any number');
    return;
 }
 if (isNaN(a) || isNaN(b))
 {
    alert('Please enter any number');
    return;
 }
 var x = Number(a) + Number(b);
 document.getElementById("demo").innerHTML = "Add Value: " + x;
 }
 </script>

 </body>
 </html>

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how to show alert when user enter other then number value in textfield

By : Patrick

Date : March 29 2020, 07:55 AM

I hope this helps you . I have iphone app in which i enter any number value like 10 2 0 1 0.2 etc i want that instead of this if user enter any text it should alert that enter a number. , try this code:

code :

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    if (textField==txtMobileNo) 
    {
        [self validatePhone];
    }else
    {
        [textField resignFirstResponder];

    }
    // called when 'return' key pressed. return NO to ignore.
    return YES;
}

- (BOOL) validatePhone
{
    NSString *phoneRegex = @"^+(?:[0-9] ?){6,14}[0-9]$"; 
    NSPredicate *phoneTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", phoneRegex]; 
    if ([phoneTest evaluateWithObject:txtMobileNo.text] == YES) 
    {
        NSLog(@"proper phone nO ");        
        return YES;   
    }
    else
    {
        UIAlertView *alert=[[UIAlertView alloc] initWithTitle:nil message:@"Please,Enter Your Person proper phone no" delegate:self cancelButtonTitle:@"Dismiss" otherButtonTitles:nil  ];
        [alert show];
        [alert release];
        NSLog(@"phone no. not in proper format");
        return NO;
        [txtMobileNo becomeFirstResponder];

    }  
}

Display Alert if user enters 0 in the second EditText

By : user7614530

Date : March 29 2020, 07:55 AM

I think the issue was by ths following , I am making a calculator app in which I wanna show an alert is user divides anything by zero.REST all works fine but i user divides anything by zero an alert should b raised , Simple, Just add one more condition

code :

div.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                a = e1.getText().toString();
                b = e2.getText().toString();
                AlertDialog.Builder a1 = new AlertDialog.Builder(c);
                try{
                if (a.equals("") || b.equals("") || b.equals("0")) {

                 ........
                .........

if (a.equals("") || b.equals("") {
     .......
     .......
}else if (b.equals("0")){
              AlertDialog.Builder a1 = new AlertDialog.Builder(calci.this);
              a1.setTitle("INVALID");
              a1.setMessage("CAnnot divide by zero");
              a1.setPositiveButton("YES",
                      new DialogInterface.OnClickListener() {
                          public void onClick(DialogInterface dialog,
                                  int button1) {
                              // if this button is clicked, close
                              // current activity
                              dialog.cancel();
                          }

                      });
              AlertDialog alertDialog = a1.create();
              a1.show();
}else{
 ....  
 ....  
}

If Statement Needs to Alert the Number That the User Enters

By : Mykola Chornii

Date : November 17 2020, 09:01 AM

this one helps. Just change your alert to take the variable name out of the string being shown, like so:

code :

 window.alert(firstNumber + " is larger");

I want throw an alert after the user enters wrong password (the validation is from DB), I need to generate alert from my

By : Kim Marcus

Date : March 29 2020, 07:55 AM

wish helps you You are mixing client side and server side. And you are trying to forward to a HTML page which is not allowed: you can only forward to a servlet running in the same servlet context as the originating one.
You must choose one:

code :

response.setContentType("text/html");  
pw.println("<script type=\"text/javascript\">");  
pw.println("alert('Wrong password');");  
pw.println("window.location.assign('/path/to/index.html');");  
pw.println("</script>");

How to alert when user enters nothing?

By : Jim Bob QC

Date : March 29 2020, 07:55 AM

I wish this help you I'm making a JavaScript project and I want to alert when the user enters nothing in the prompt

code :

function verifyage() {
  var age = prompt("enter your age:", "");
  if(isNaN(parseFloat(age))) {          // check: if user entered a number/string/blank
    alert("You entered nothing");
  }
  else {
    var status = (age >= 18) ? "adult" : "minor";
      if(status == "minor") {
        alert("you are too young");
      } else if (status == "adult") {
        alert("you're in");
      } 
  }
}
verifyage();