Uncaught TypeError indexOf is not a function

Question

I am new to JavaScript and I m getting an error as below      Uncaught TypeError  time indexOf is not a function   Gee  I really thought indexOf   really was a function   Here is a snippet of my code       var timeofday   new Date   getHours      new Date   getMinutes      60      document getElementById  oset   innerHTML   timeD2C timeofday    lt  script gt     lt script gt   function timeD2C time       Converts 11 5  decimal  to 11 30  colon      var pos   time indexOf           var hrs   time substr 1  pos - 1       var min    time substr pos  2     60       if  hrs  gt  11            hrs    hrs - 12          min     PM         else           hrs          min     AM             return hrs     lt  script gt

User · Answer

I ran across this error recently using a javascript library which changes the parameters of a function based on conditions.

You can test an object to see if it has the function. I would only do this in scenarios where you don't control what is getting passed to you.

if( param.indexOf != undefined ) {
   // we have a string or other object that 
   // happens to have a function named indexOf
}

You can test this in your browser console:

> (3).indexOf == undefined;
true

> "".indexOf == undefined;
false

User · Answer

I was getting e data indexOf is not a function error  after debugging it  I found that it was actually a TypeError  which meant  indexOf   being a function is applicable to strings  so I typecasted the data like the following and then used the indexOf   method to make it work e data toString   indexOf   lt stringToBeMatchedToPosition gt     Not sure if my answer was accurate to the question  but yes shared my opinion as i faced a similar kind of situation

User · Answer

Basically indexOf   is a method belongs to string array object also   But while calling the function you are passing a number  try to cast it to a string and pass it   document getElementById  oset   innerHTML   timeD2C timeofday           x000D   x000D   var timeofday   new Date   getHours      new Date   getMinutes      60  x000D   x000D   x000D   x000D   x000D   function timeD2C time       Converts 11 5  decimal  to 11 30  colon  x000D      var pos   time indexOf       x000D      var hrs   time substr 1  pos - 1   x000D      var min    time substr pos  2     60  x000D   x000D      if  hrs  gt  11    x000D          hrs    hrs - 12          min     PM   x000D        else   x000D          hrs          min     AM   x000D        x000D      return hrs  x000D    x000D  alert timeD2C timeofday       x000D   x000D   x000D      And it is good to do the string conversion inside your function definition   function timeD2C time       time   time         var pos   time indexOf         So that the code flow won t break at times when devs forget to pass a string into this function

User · Answer

Convert timeofday to string to use indexOf  var timeofday   new Date   getHours      new Date   getMinutes      60  console log typeof timeofday      for testing will log number function timeD2C time       Converts 11 5  decimal  to 11 30  colon      var pos   time indexOf           var hrs   time substr 1  pos - 1       var min    time substr pos  2     60       if  hrs  gt  11            hrs    hrs - 12          min     PM         else           hrs          min     AM             return hrs           for typecasting to string  document getElementById  oset   innerHTML   timeD2C    timeofday     Test Here  Solution 2  use toString   to convert to string  document getElementById  oset   innerHTML   timeD2C timeofday toString       jsfiddle with toString

[javascript] Uncaught TypeError: .indexOf is not a function

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