fire client alert script from submit button

[playout]

Hi, I need to validate a textbox, using javascript and an alert box. If the user clicks the submit button, and a value for a textbox is not filled in, I want to alert the user, and stop the submit process... if the value is filled in, the user can proceed with the submit process. How can I do this, and where can I read more about this type of validation.

[MIHAI_MTZ]

You should use the "OnClientClick" property of the Submit button. Just use it to specify a javascript function. A requiredfield validator is also a good choice althoug it's not designed to show alert boxes. Mihai,

[Tuwing Sabado]

Use required field validator and validation summary. In order to show a popup message when validation failed. Use the code below or use the property window. eg. ValidationSummary1.DisplayMode = ValidationSummaryDisplayMode.BulletList; ValidationSummary1.ShowMessageBox = false; Regards, Mark

[www Developerof NET]

I would also prefer validation summary but if you want to show alert ,this is how u can In the form tag call a javascript function onSubmit.

in script tag (in head) write the foll code function Validate() { var txt=document.getElementById("TextBox1").text; if(txt=="") { alert("Feild should not be empty"); return false; } else return true; } -- modified at 16:32 Tuesday 27th February, 2007

[wilf57]

try onClick="return confirm('Ready to submit');" or in ASP.Net onClientClick="return confirm('Ready to submit');" the return value influences the submit process: false stopps the submit if that works write a java script function (ex. Check), wich checks the textbox for empty and returns false if so and tie it to the onClientClick-event onClientClick="return check();"