JavaScript check for checkboxes, error hints and button discoloration actions

Agree to the relevant terms when not ticked, the login button is gray and cannot be submitted, click the gray Sign-in button to agree to the relevant terms, tick and turn into bright light and can submit information.

check box and text:

1 <div class= "Check-rule" >2     <label>3         <input type= "checkbox" Name = "id=" check "class=" hidden "onchange=" Boxchange (This) ">4         <i class=" Check "></i>5      </label>6         I agree to the relevant terms <span ><font  id= "agreerule" color= "Red" size= "3" > </font></span>7 </div>

JS Code button Color Realization:

functionBoxchange (obj) {if($ (obj). Prop ("Checked")){            //Check Action            varNewbtn=document.getelementbyid ("Regist"). src= ". /resources/img/regist-btn.png "; $("#regist"). CSS ("Background", ' url (' + newbtn + ') '); $("#agreeRule"). Hide (); }Else{            //Uncheck Action            varNewbtn=document.getelementbyid ("Regist"). src= ". /resources/img/regist-btngray1.png "; $("#regist"). CSS ("Background", ' url (' + newbtn + ') '); document.getElementById ("Agreerule"). Innerhtml= "Please agree to the relevant terms"; $("#agreeRule"). Show (); }    }

The JS code determines if the checkbox is selected:

function Verify () {        var ischeck=$ ("#check"). Get (0). checked;   Gets the selected state, which returns TRUE or False         if(!  Ischeck) {            document.getElementById ("Agreerule"). Innerhtml= "Please agree to the relevant terms";              return ;         } Else {//         Related actions ...     }

JavaScript check for checkboxes, error hints and button discoloration actions