Restricting characters in TextInput can be easily done, but how can I check if particular character was restricted without manually parsing the restrict property?
For example: restrict='a-zA-Z^L-W'.
How do i get that B is allowed and M is forbidden?
If it matters, I need this functionality to show a user the explanation why his key presses don't affect the input content.
I was able to implement the message by checking input.text.indexOf(keydownchar)==-1, but I'm interested if there's any SDK method to check the char without trying to append it into the input control.
There's no SDK method to check the incoming char. You'll have to query the restrict text (ideally on the changing event).
It can be done with
StringUtil.restrict(str:String, restrict:String):String
It is exactly the method used by text display controls like RichEditableText to handle restrict property.
There's also more suitable method for testing single char, but unfortunately it's private:
StringUtil.testCharacter(charCode:uint, restrict:String):Boolean
Anyways it is used inside StringUtil.restrict, so using StringUtil.restrict instead of testCharacter will produce the same result with performance overhead.
Related
As we know, ASP.NET WebForms will generate a Unique ID (as well as name) to a control to prevent collisions in the control heirarchy. Let's say we have a TextBox control with an assigned ID of "MyTextBox" in the markup. If this textbox is on a page with a Master Page then the TextBox control will be given a Unique ID of "ctl00$MainContent$MyTextBox" or something similar.
What I want to know is, for a given page, is it possible to know what the prefix WILL BE? In my above example I would like to know all controls I create on that page will be assigned with a prefix of "ctl00$MainContent$". I have examined the Page object and I cannot find an easy way to extract this information. Note: inspecting already existing controls on the page (like the TextBox) isn't an option. I simply need to know, at run time, what the prefix would be.
-- EDIT: Why do I need to do this? --
Ultimately I am trying to solve the problem that this post illustrates:
ASP.NET 4.5 TryUpdateModel not picking Form values in WebForm using Master-Page
I'm using the ModelBinding features introduced in ASP.NET 4.5. Problem is, as the above post points out, is that the name value collection found in the form will NOT match up with your model's properties. The built-in FormValueProvider expects a one-to-one match with the form key (name) and the model's properties. Unfortuantely, the form's keys will have the typical "ctl00$MainContent$" prefix to the names.
I have a semi-working solution where I created a custom IValueProvider that compares the end of the form key with the model's property. This works 95% of the time, but there's always a chance of multiple hits.
Ideally, and this is what I'm trying to figure out, if I could determine WHAT the prefix is I can then prefix that the IValueProvider's passed in key, look for that in the form and find the exact match.
So that is why I'm wondering if there's any way to know what the prefix should be for a given page.
The real answer is to simply code in such a way that you never have to know this information. that might not always be easy - but that's quite much what we do. You can certainly in code behind get/grab the "id" of the given button.
so for example, I become VERY tired of having to wire up a little toast message all over the place. So, I put in a little js routine (in the master page).
But I did need the client ID of a given control.
Well, the code behind needed (wants) to place the toast message next to whatever I clicked on.
So my server side "toast" message caller of course will after the server side code is done does the common "script" inject that will run when the page finally makes it final trip back down to the browser, displays the page, and then of course runs that script I injected.
So, my server side code does this:
MyToast2(Me, btnUpdate.ClientID.ToString, "Update ok!", "Settings changed")
So note how I get/grab/pass the "ID" of the control that the server is going to render. You can use ClientID to get the the final "ID" used for that control in code behind.
So, that btnUpdate is just a simple button placed on the web form. But who cares what super ugly "ID" the server assigns. i just need the "id" of the control so the JavaScript client side can pick up that control - and thus know/get/have the position of the control, and thus I get this result:
Or if I am some place else - again I can call that js routine - and that routine needs the current control. so might have this:
So, I can now just call a routine and pop up a message - not have to write any new js code for the gallzion notices and little pops I have all over the place.
so the little javaScript routine of course does this:
function toastcallm(cntrol, h, t, d) {
var cmd = $('#' + cntrol);
var mypos = cmd.position();
bla bla bla
But only important was that I get/determine and pass the used server "client" id to that routine - I don't really care what it is , or how to see, or how to list them out. I suppose a better jQuery selector or using wild card might work - but I really don't want to know the control ahead of time - but only that I can get the clientID used when I need it.
I simply write code that assumes somewhere along the way when I need such a client id, I simply get it and use it.
So, on the server side? Well, we always build and write code based on the control ID, but you want to get your hands on the actual id? Then you can use in the server code behind:
btnUpdate.ClientID.ToString
(ie: somecontrol.ClientID).
I have three different fields/textbox widgets, that rely on querying the same data source to be checked to avoid duplication. For reasons, I do not want to turn on the unique/required for those three fields.
I put some code to check for validation. My problem is that when I call the form's validate function, it takes some time till the validation comes back with an error message. However the form's validate returns immediately and allows people to click Submit.
How can I avoid this problem?
Block till validation kicks (setTimeout function?)
Set a separate invisible field such as working and set the validationError on the field and clear after validations clear? This will probably be a numeric field so that I can wait for all streams in parallel to finish.
Final question. is Validate a blocking function as it goes through the fields? I am guessing Yes.
I'm trying to add a checkbox to the standard payadvice driver program to enable the user to e-mail the form instead of printing it.
Because the print program is automagically generated from the print form (transaction HRFORMS), I can't just go and change the program.
Within transaction HRFORMS I have some control over the selection screen via Optional Selection fields below: Is it somehow possible to add a custom selection criteria to this via config?
I could wrap the generated program in a custom program of my own, but then I would lose a lot of the existing configurability.
I have been unable to find a configurable solution.
However, SAP already provides a standard wrapper program for HRFORMS:
H99_HRFORMS_CALL
I enhanced the selection screen in this program using implicit enhancement points, and passed the necessary parameters to the print form using Parameter ID's.
The issue:
I'm trying to transform and route a message based on its input file name. The file name gives hints about how the data should be processed. Being a noob I'm reasonably sure I'm doing this the hard way...
I created an orchestration. I transform the message from the input schema to the output schema. I'd like to examine the file name and add a little logic to classify the input message. That works just fine.
What I tried:
I added an expression shape after the transformation. I added logic to classify the message and assign that to a property. It won't allow me to change the property (messages are immutable?)
I added a construct message shape. I can set properties in a new message within this shape but it doesn't allow "if" statements or conditional assignments in the expression. I need conditional logic to search the file name string and set the property to one of several choices.
Any suggestions?
You can either wrap your logic into a .net helper method and call this from the assignment shape, or you can use the conditional flow control shapes provided by biztalk, such as the decide shape, and have multiple contruct shapes in your branches.
Let me know if you need more detail about either approach via a comment and I will expand the answer to include.
Hope this helps.
You could use a helper class to take the file name and return the value to set in the property.
Alternatively, you could use the decide shape for your if..then..else.
Have I understood your question?
HTH...
We heard a lot about the vulnerabilities of using QueryStrings and the possible attacks.
Aside from that, yesterday, an error irritated me so much that i just decide to stop using QueryStrings, i was passing something like:
Dim url As String = "pageName.aspx?type=3&st=34&am=87&m=9"
I tried to
Response.Write(url)
in the redirecting page, it printed the "type" as 3, then i tried it in the target page, it printed 3,0....i know this can be easily dealt with, but why? i mean why should i pass 3 and have to check for 3.0 in the next page's load to take my action accordingly???
So what should we use? what is the safest way to pass variables, parameters...etc to the next page?
You could use Cross-Page Postbacks.
Check also this article:
How to: Pass Values Between ASP.NET Web Pages
There are many options you can use, most of them requires you to build a strategy to pass variables between pages.
In most projects I use this strategy, I create a formVariables class to hold currently active items. it has properties which you will need to pass by querystring. and I store this class at session. and in my base page I read it from session. so in every page I get values over this object. the only negative thing about this method is to clean up items when you finished your work on it..
hope this helps.
I would sugest you avoid using Session to pass variables between pages as this breaks the stateless model of the web.
if you have just stored some values in session that relate to a certain page then the user uses their browsers back button to go back to the same page whcih should have a different state then you are not going to know about it.
It leads to the possibility of reading session values that are not relevant to the page the user is currently viewing - Which is potentially very confusing for the end user.
You will also run into issues with session expiration if you rely on it too much.
I personally try to avoid using session where possible in preference of hidden form values + query strings that can be read on postback + navigation.
The best / most secure way to pass info between pages is to use the session.
// On page 1:
this.Session["type"] = 3;
// On Page 2:
int type = (int)this.Session["type"];
You can store any kind of object in the session and it is stored on the server side, so the user can't manipulate it like a query string, viewstate, or hidden field
You said:
it printed 3,0....i know this can be easily dealt with, but why? i mean why should i pass 3 and have to check for 3.0
There's a difference between "3,0" (three comma oh) and "3.0" (three point oh). You also said that you were "passing something like".
In a query string, if you pass multiple values in the same key, they will be seperated with commas.
As all values are passed as strings there's no way that an int "3" is going to magically become decimal "3.0" unless you parse it as such when you request it.
I'd go back and double check what you are passing into your URL, if it ends up as something like:
pageName.aspx?type=3&st=34&am=87&m=9&type=0
Then when you read back
Request.QueryString["type"]
You'll get "3,0" back as the comma seperated list of values in that key.
First, in asp .net you can use several strategys to pass values between pages. You have viewstate too, however the viewstate store the value and the use is in different scenarios , you can use it too. Sessions instead, and of course by post in a form.
If your problem is the security, I recommended you to create 2 users for accesing the data. One user with read only access, this for accessing the pages ( Sql Inyection prevent ) and validate the data throw the querystring. And One with write access for your private zone.
Sorry, for my unreadeable English.
I like to use query string as I like users to be able to bookmark things like common searches and the like. E.g. if a page can work stand-alone then I like to it to be able to work stand-alone.
Using session/cross-page postbacks is cool if you needed to come from another page for the page you're on to make sense, but otherwise I generally find querystrings to be the better solution.
Just remember that query strings are unvalidated input and treat them with the caution you would treat any unvalidated input.
If you do proper security checks on each page load then the querystring is fine and most flexible IMHO.
They provide the most flexibility as the entry poitn to a page is not dependant on the sender as in some other options. You can call a page from any point within your own app or externally if needed via querystrings. They can also be bookmarked and manually modified for testing or direct manipulation.
Again the key is adding proper security and validation to the querystring, and not processing it blindly. Keep in mind that the seucirty goes beyond having edit or read access, depending on the data and user, they may not have access to the data with thos paranters at all, in cases where data is owned and private to specific users.
We have tried various methods, in an attempt to hide the querystring but in the end have gone back to it, as it is easier to do, debug, and manage.