 Form Problem, prevent submit if value="examplevalue" |
Open Discussion > CONTRIBUTE > Computers > Programming Languages > Java, Java Servlets, Java Script, & JSP|
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 May 12 2005, 09:30 AM
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#1
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Advanced Member  Group: Members Posts: 142 Joined: 24-September 04 From: Belgium Member No.: 1,260  |
i would like to have a code inserted to a form that prevents submitting if one of the inputfields (in particular) contains the value: "examplevalue" . Does anyone know the solution to this?
btw: the texts in other inputfields shouldn't be cleared if possible.. thanks in advance 
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May 12 2005, 09:32 AM
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#2
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Advanced Member Group: Members Posts: 142 Joined: 24-September 04 From: Belgium Member No.: 1,260 |
i didn't meant the value of one in particular input(text)field, but the text inside the textfield actually..
-sorry for the double post 
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May 12 2005, 09:56 AM
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#3
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Super Member Group: Members Posts: 362 Joined: 2-March 05 From: The Netherlands Member No.: 4,097 |
I think php-code would be the solution here (not completely sure)
<?php $value=""; echo "<form action=\"xx\" method=\"post\">"; echo "<input type=\"text\" value=$value name=\"xx\">"; if($value=="examplevalue"){ echo "You are not allowed to insert that name"; } ?> I know its not completely well written, but it globally shows how to do this(i think) |
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May 12 2005, 10:07 AM
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#4
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Advanced Member Group: Members Posts: 142 Joined: 24-September 04 From: Belgium Member No.: 1,260 |
HmmZ: I think php-code would be the solution here (not completely sure)
... I know its not completely well written, but it globally shows how to do this(i think) ok thanks, i will try it out and post the results as soon as possible!
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May 12 2005, 12:30 PM
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#5
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Member [Level 1] Group: Members Posts: 69 Joined: 12-March 05 From: Australia Member No.: 4,401 |
I use javascript for that same type of thing...
CODE <script> function checkField(value) { if (value == "examplevalue") { alert("You cannot enter '" + value + "'"); return false; } else return true; } </script> then in your form tag you place an onSubmit call... where formName is the name of your form [as shown] and inputName is the name of the input field you want to check. HTML <form name="formName" onSubmit="return checkField(formName.inputName.value)"> This will not let the form submit if the value of inputName is equal to examplevalue. |
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May 12 2005, 01:04 PM
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#6
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Super Member Group: Members Posts: 351 Joined: 19-October 04 From: India Member No.: 1,824 |
yup... you can use javascript for that.
the solution given by "theRealSheep" looks good. If you want to compare with a substring or if the case is that the text should not contain "examplevalue" i.e, it should not be even part of it, you can use the index of function Change the above code as follows: CODE if(value.indexOf("examplevalue")>-1){ alert("you cannot enter this"); // reset all other fields here if you want field1.value = ''; field2.value = ''; ... } Cheers. |
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May 12 2005, 03:15 PM
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#7
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Incest is a game the whole family can play.  Group: [MODERATOR] Posts: 1,227 Joined: 11-February 05 From: Heaven Member No.: 3,709 |
Don't use javascript, use php, cgi or asp but don't use javascript or html.
Why? Because it's so easy to get passed, all they have to do is viewsource and type in something else and eureaka they've passed. ------------------------------------ Assuming it's for a subscription form... ------------------------------------ If you use php, I recommend you should make it so they can't fill in the form again. To do this you could: 1) Set a cookie 2) Add their ip address to a list of forbidden ips. Go for number 2, preferably, as it's harder to pass as if you went for no. 1 they could just delete their cookies. If you like any of these suggestions don't ask me because I know little php or cgi. I like asp 
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