enable or disable checkbox from javascript not happening

Question

<legend>Information</legend>
<div class="row">
    <div class="col-xs-12 col-sm-3 col-md-3">
       <label><strong>{{$val}}</strong></label>
    </div>
    <script>
        var str = "Hello world!";
        var res = str.substring(0, 2);
        if (res == ee) {
            alert("Hello! I am an alert box!");
        } else if (res == he) {
            document.getElementById("checkbox").checked = true;
        }
    </script>
    <div class="col-xs-12 col-sm-3 col-md-3">
        <input type="checkbox" name="operator" id="checkbox" >
    </div>
    <div class="col-xs-12 col-sm-3 col-md-3">
        <input type="checkbox" name="operator" id="checkbox">
    </div>
    <div class="col-xs-12 col-sm-3 col-md-3">
        <input type="checkbox" name="operator" id="checkbox">
    </div>
</div>
										
<br/>

i have included my html piece of code above. i don't know why check box is not responding for this piece of JavaScript. note: i should use JavaScript in the position between div's

Please use class for this! Use unique id's! Never use same id's... — tRx
– tRx, Commented Nov 25, 2015 at 7:12

Milind Anantwar · Accepted Answer · 2015-11-25 07:12:56Z

2

value ee and he should be wrapped in quotes. also note that IDs should be unique, you can rather use common class and use getElementsByClassName to target all of them using class :

var res = str.substring(0, 2);
if(res=='ee'){
  alert("Hello! I am an alert box!");
}
else if(res=='he'){
  document.getElementsByClassName("checkbox").checked = true;
}

answered Nov 25, 2015 at 7:12

Milind Anantwar

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4 Comments

Vijay Kumar Over a year ago

see this js fiddle jsfiddle.net/vcbwrg0L/1 still its not working

Milind Anantwar Over a year ago

@VijayKumar: H should be capital in he or convert substring to lowercase and then compare. jsfiddle.net/peokog8m

Milind Anantwar Over a year ago

@VijayKumar: check the fiddle which i shared. script should be there after dom element.

Vijay Kumar Over a year ago

can i concatenate two strings for id of input fields like <input type="checkbox" name="operator" id="'11' + '00'" >

Suresh Ponnukalai · Accepted Answer · 2015-11-25 07:13:40Z

0

Condition is wrong. If you want check the string element you have to use "" or ''. Otherwise it will treat as a variable.

  if(res=="ee"){
     alert("Hello! I am an alert box!");
   }
   else if(res=="he"){
     document.getElementById("checkbox").checked = true;
   }

answered Nov 25, 2015 at 7:13

Suresh Ponnukalai

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