Im making a little form where you can pick your value.
If the value is not filled in correctly(I have given some example answers) I want an alertbox to pop-up which indicates the incorrectly filled in textfields.
Cant seem to make it work... This is what I tried
if(document.getElementById("BS").value.match ("thin","thick","medium")
{
alert("Fill in the correct values");
}
Here is the fiddle. http://jsfiddle.net/vuc8Z/
Here is my suggestion:
var val = document.getElementById("BD").value;
if (!(val == "thin" || val =="thick" || val =="medium")) {
alert("Vul een geldige waarde in bij de aangegeven velden");
}
Demo here
Notice that you were using getElementById("BS")
, but you wanted BD
i think. I changed your match function to a triple ||
(or) if statement.
I moved your if statement to inside the "go" button click handler so it is fired when the button is clicked.
The match() function expects a regex, you can read more here ( MDN: .match() ).
EDIT:
To check if the color text input is in the right format you can use this:
var filter = /^#(?:[0-9a-fA-F]{3}){1,2}$/;
if (!color.match(filter)) {
alert('Color code Error!');
}
Updated demo here
If you want to use match method then you can use like :
var str = document.getElementById("BD").value;
if(str.match('thin') || str.match('thick') || str.match('medium'))
{
alert("Fill in the correct values");
}
As per my knowledge match takes regular expression as parameter and don't take multiple values.
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