javascript - Form Validation not working as expected -


i have made cart-mechanism using php , done validation of javascript , validation not working.

this actual php script:

$result = mysqli_query($conn, "select * products"); while($row = mysqli_fetch_array($result)){    $fieldidval[] = $row['product_id'];   $fieldnameval[] = $row['product_name'];   $fieldcostval[] = $row['product_cost'];   $fieldimgval[] = $row['product_image'];   $fielddescval[] = $row['product_description'];  }  //printing field values  for($i = 0; $i < mysqli_num_rows($result); $i++){    echo "<tr><form action = 'cart.php?pid=" . $fieldidval[$i] . "&name=" .$fieldnameval[$i] . "&cost=" . $fieldcostval[$i] . "' method = 'post' name = 'tocart' onsubmit = 'return(validateall());'><td>" . $fieldnameval[$i] . "</td><td>" . $fieldcostval[$i] . "</td><td>" . $fieldimgval[$i] . "</td><td>" . $fielddescval[$i] . "</td><td><input type = 'text' name ='qty_input[$i]' ></td><td><input type = 'submit' name = 'submit'></td></form></tr>"; }

and validation in javascript:

function validateall(){   if( document.tocart.qty_input[0].value == "" ){     alert("please enter valid number");     document.tocart.qty_input.focus();     return false;   }

when hit submit nothing works.

converting comment answer

if keep inline submit handler, pass form using this

onsubmit = 'return validateall(this);'

then can access form directly in handler without having use longer document.formname

function validateall(form) { // "this" -> whatever in (....) here   var qty_input= form["qty_input[0]"];    if (qty_input.value == "") {      alert("please enter valid number");       qty_input.focus();       return false;    } }

here better way using unobtrusive code

window.onload=function() { // when page loads. can use event listener   document.queryselector("[name=tocart]").onsubmit=function() {     var qty_inputs = document.queryselectorall("[name^=qty_input]"); // starts     (var i=0;i<qty_inputs.length;i++) {        if (qty_inputs[i].value == "") {           alert("please enter valid number");           qty_inputs[i].focus();           return false;        }     }   } }

and can avoided using 

<input type = 'text' name ='qty_input[$i]' required />

Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj...
Read more

performance - Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? -

i'm doing micro-optimization on performance critical part of code , came across sequence of instructions (in at&t syntax): add %rax, %rbx mov %rdx, %rax mov %rbx, %rdx i thought had use case xchg allow me shave instruction , write: add %rbx, %rax xchg %rax, %rdx however, dimay found agner fog's instruction tables , xchg 3 micro-op instruction 2 cycle latency on sandy bridge, ivy bridge, broadwell, haswell , skylake. 3 whole micro-ops , 2 cycles of latency! 3 micro-ops throws off 4-1-1-1 cadence , 2 cycle latency makes worse original in best case since last 2 instructions in original might execute in parallel. now... cpu might breaking instruction micro-ops equivalent to: mov %rax, %tmp mov %rdx, %rax mov %tmp, %rdx where tmp anonymous internal register , suppose last 2 micro-ops run in parallel latency 2 cycles. given register renaming occurs on these micro-architectures, though, doesn't make sense me done way. why wouldn't register renamer ...
Read more

c# - Asp.net web api : redirect unauthorized requst to forbidden page -

im trying redirect unauthorized request forbidden page instead i'm getting forbidden page in response body , how can fix ? here's startup class : app.createperowincontext(storecontext.create); app.createperowincontext<applicationusermanager>(applicationusermanager.create); app.createperowincontext<applicationsigninmanager>(applicationsigninmanager.create); app.usecookieauthentication(new cookieauthenticationoptions { authenticationtype = defaultauthenticationtypes.applicationcookie, expiretimespan = timespan.fromdays(30), }); app.useexternalsignincookie(defaultauthenticationtypes.externalcookie); app.usetwofactorsignincookie(defaultauthenticationtypes.twofactorcookie, timespan.fromminutes(5)); app.usetwofactorrememberbrowsercookie(defaultauthenticationtypes.twofactorrememberbrowsercookie); the method im trying reach : [httpget] [authorize(roles = "admin")] public string getcurrentusername() { return userman...
Read more