javascript - Validation of input elements haing name as array -

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i have textbox , upload file like:

<input type="text" id = "contract_copy_text[]" name="contract_copy_text[]" value="" maxlength="50"/> <input type="file" name="contract_copy_pdf[]" id="contract_copy_pdf[]" accept="application/pdf" />

i not able validate it.

i have tried :

var contract_copy_text = $('#contract_copy_text[]').val(); // document.getelementbyid('contract_copy_text').value;     var contract_copy_pdf = $('#contract_copy_pdf[]').val(); // document.getelementbyid('contract_copy_pdf').value;      if (contract_copy_text == "") {         alert("insert contract copy title file");         $('#err_lbl_contract_copy_text').html('insert contract copy title file');         return false;     }      if (contract_copy_pdf == "") {         alert("please select contract copy pdf file upload");         $('#err_lbl_contract_copy_pdf').html('please select contract copy pdf file upload');         return false;     }

but doesn't work.

please note: these fields dynamically generated required(on click). can tell me mistake making.

update:

please see fiddle

the problem in way wrote jquery selectors here:

var contract_copy_text = $('#contract_copy_text[]').val(); var contract_copy_pdf = $('#contract_copy_pdf[]').val();

you must escape [ , ] characters (using \\) because they have special meaning inside selector expression:

var contract_copy_text = $('#contract_copy_text\\[\\]').val(); var contract_copy_pdf = $('#contract_copy_pdf\\[\\]').val();

source https://api.jquery.com/category/selectors/ :

to use of meta-characters ( such !"#$%&'()*+,./:;<=>?@[]^`{|}~ ) literal part of name, must escaped with 2 backslashes: \.


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