javascript - Enable/Disable a button using dojo toolkit -

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i have declared button in html , want dynamically enable/disable using javascript , dojo toolkit.

i have made following code, should minimal working example:

<html> <head> <script language="javascript" type="text/javascript"> require(["dojo/dom", "dojo/on", "dojo/request", "dojo/domready!"],         function(dom, on, request){             on(dom.byid("password"), "keyup", function(evt){                 request.get("/passwordchecker",                         {                             query: {                                 user: document.getelementbyid("username").value,                                 pass: document.getelementbyid("password").value                             }                         }).then(                     function(response){                         if(strength === "strong") {                             dijit.byid("ok").setattribute('disabled',false);                         }                     }                 );             });         }     ); </script> </head>  <body> <input id="username" type="text"/> <input id="password" type="text"/> <button id="ok" dojotype="dijit.form.button" type="submit" disabled="disabled">ok</button> </body> </html>

in other words want user enter password. use ajax check if strong enough , if want enable ok-button.

i rewrote code follows:

function updateokbutton(strength) {     if(strength === "strong") {     //  domattr.set(okbutton, 'disabled', false);         require(['dojo/on', 'dojo/dom', 'dojo/dom-attr'],         function (on, dom, domattr) {             var okbutton = dom.byid("ok");             domattr.set(okbutton, 'disabled', false);         });     } }

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