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3,600 questions
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Hi @Harun Ergün
You can perform judgments by adding the attribute "onsubmit" to the form tag.
Example:
Model:
public class Student
{
public string Name { get; set; }
public int Telephone { get; set; }
}
Controller:
public class HomeController : Controller
{
public ActionResult Index()
{
return View();
}
public ActionResult About()
{
ViewBag.Message = "Your application description page.";
return View();
}
public ActionResult Contact()
{
ViewBag.Message = "Your contact page.";
return View();
}
[HttpPost]
public ActionResult form1(string txtName,string txtTel)
{
ViewBag.Name = txtName;
ViewBag.Tel = txtTel;
return View("Index");
}
}
View:
<form action="form1" method="post" onsubmit="return demo()">
<table>
<tr>
<td>Enter Name: </td>
<td><input type="text" name="txtName" id="txtName" /></td>
</tr>
<tr>
<td>Enter Tel: </td>
<td><input type="number" name="txtTel" id="txtTel" /></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="Submit Form" /></td>
</tr>
</table>
</form>
<script>
function demo() {
var a = document.getElementById("txtName");
var b = document.getElementById("txtTel");
var txtName = a.value;
var txtTel = b.value;
if (txtName.length < 5 && txtTel.length < 11) {
alert("Error");
return false;
}
}
</script>
In this way, a judgment will be made after the data is submitted. Submissions will only be made if they meet the requirements.
Output:
Best Regards
Qi You
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