Va lida t ing t h e D a t a on a W eb Pa ge in VB.NET

Encoder Data Matrix in VB.NET Va lida t ing t h e D a t a on a W eb Pa ge

Va lida t ing t h e D a t a on a W eb Pa ge
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ASP.NET int roduces som e powerful cont r ols for facilit at ing v alidat ion of t he dat a in cont r ols on Web pages. You can use t hese power ful cont rols graphically or bot h graphically and pr ogr am m at ically . This sect ion int r oduces you t o t he cont rols ov erall and t hen pr esent s a series of t hr ee sam ples t o dem onst rat e how t o apply validat or cont rols in y our Web applicat ions.
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ASP.NET offers five special Web ser ver cont r ols t o facilit at e validat ing t he dat a users ent er int o ot her cont rols on a Web page. You can use t hese special Web serv er cont rols w it hout any program m ing, or y ou can use t he Page obj ect m odel for pr ogram m at ically responding t o t he validat ion cont rols indiv idually or collect ively. I n addit ion, t he fiv e validat ion cont rols enable y ou t o dict at e how t o display err ors. Basically , t her e ar e t wo display opt ions wit h som e var iat ions in bet ween. First , you can show er r or m essages indiv idually near t he cont rols t o which t he m essages apply. Second, y ou can choose t o display er ror m essages collect ively in a cent ral area. You can drag t o a Web page any of t he fiv e t ypes of validat or Web serv er cont rols from t he Web Form s t ab on t he Toolbar . For each cont rol, y ou m ust specify t he Cont rolToValidat e pr opert y, which designat es t he cont r ol t o w hich t he Web serv er validat or cont rol applies. You can opt ionally specify a cust om er ror m essage or accept t he default error m essage associat ed w it h t he validat or cont r ol, and select ed validat or cont r ols m ay hav e ot her m andat ory or opt ional pr opert ies t o set . Br ief sum m aries of t he fiv e t ypes of v alidat or cont rols appear below. The RequiredFieldValidat or cont rol det ect s a m issing value for a validat ed cont r ol. This is t he only validat or cont rol t hat checks for em pt y cont r ols, and y ou m ight t her efore want t o use Requir edFieldValidat or cont rols w it h ot her Web serv er validat or cont r ols. The Com par eValidat or cont rol uses a com par ison operat or, such as less t han, equal t o, or gr eat er t han, t o det erm ine how a pr opert y for a t arget cont r ol com pares w it h anot her value. You can also use Com pareValidat or t o check t he dat a t ype of an ent ry . The RangeValidat or cont rol can check t o ensur e t hat a t arget cont rol s propert y is in a specified range. This validat or cont rol let s y ou set low er and upper boundary values for validat ing a cont rol. The RegularExpr essionValidat or cont r ol enables you t o check t hat ent r ies follow a pat t er n, such as for t elephone num ber s or social secur it y num bers. The Validat ionExpression pr opert y in t he Propert ies window for t his v alidat or cont rol offers a select ion of prespecified regular expr essions for such ent r ies as phone num ber, post al code, e- m ail addr ess, and social secur it y num ber. I n addit ion, you can pr ogram cust om r egular expressions.
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Wit h t he Cust om Validat or cont rol, y ou can dev elop cust om checks for dat a t hat ar en t covered by t he pr eceding cont rols.
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You hav e sev eral display opt ions for showing error m essages associat ed wit h t he Web serv er validat or cont r ols. Assign a st ring t o t he Err or Message pr opert y for a validat or cont rol t o specify a cust om err or m essage, such as Ent er a com pany, inst ead of a default m essage, w hich happens t o be RequiredFieldValidat or, t he sam e t ext as t he nam e of t he cont rol t ype. The error m essages associat ed w it h a validat or cont rol w ill alw ays appear where y ou place t he cont r ol on a Web page unless you also add a Validat ionSum m ar y cont r ol t o t he page. Wit h a Validat ionSum m ar y cont rol on a page, you can hav e er ror m essages appear collect ively in t he Validat ionSum m ar y cont r ol by assigning an HTML charact er, such as an ast er isk, t o t he Text propert y for a v alidat or cont r ol. I n t his scenar io, t he HTML charact er appears w her e y ou hav e t he validat or cont r ol and t he err or m essage appears in t he Validat ionSum m ary cont r ol. By set t ing t he Display propert y for t he validat or cont rol t o None, y ou can cause no err or indicat or t o appear where t he validat or cont r ol is on a page. The only indicat ion of an er ror for t he validat or w ill be t he m essage in t he Validat ionSum m ar y cont r ol. I f you prefer t o have t he er r or m essage for a validat or cont r ol appear at t he cont rol and in t he Validat ionSum m ary cont rol, leav e t he Tex t pr opert y for t he validat or cont r ol em pt y. Wit h I nt er net Explorer 4 and lat er br owsers, t he validat ion cont rols v erify t he dat a on t he client w orkst at ion and at t he serv er unless you explicit ly specify ot her wise. I n cases in w hich y ou want t o send an im pr oper ly validat ed Web page t o a Web serv er, client - side v alidat ion can cause a problem . Som e validat or cont r ols m ight be on a Web page t o encourage com pliance w it h dat a ent ry form s, but y ou m ight not want t o decline a form fr om a user j ust because t hey fail t o com ply w it h all t he validat or cont rols on a Web page. This is especially t he case in e- com m erce applicat ions or any sit uat ion in w hich t he user is doing y our organizat ion a fav or by ret ur ning t he form . I n such sit uat ions, you can explicit ly disable client - side scr ipt validat ion by set t ing t he EnableClient Scr ipt pr opert y for t he validat or cont r ol t o False. One of t he gr eat feat ur es of v alidat or cont r ols is t hat t hey pr ov ide a lot of funct ionalit y w it hout any pr ogram m ing. How ev er , y ou can also pr ogram t he validat or cont rols and der iv e ev en m or e funct ionalit y from t hem . I f t he dat a for any validat or cont r ol on a page doesn t sat isfy t he validat or, t he page s I sValid propert y becom es False. As a consequence, y ou can use t he page s I sValid propert y t o ex ecut e blocks of code condit ionally. I n addit ion, ASP.NET support s a Validat or Collect ion obj ect for each page. Wit h t his obj ect , y ou can it erat e t hr ough t he validat or cont r ols on a page and check each m em ber s I sValid pr opert y . This capabilit y enables y ou t o r espond select iv ely t o er rors from indiv idual v alidat or cont r ols on a page.
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