Check if variable exists in array of arrays

Question

i need to get the array id and put this id number in the var pointerid = (id number from array);
i am using this code to store the cliked id from element:

jQuery('a').click(function(){
    var clickedId= $(this).attr("id");

now i want to search if 'element' : 'Equals to clickedId', if yes, get array id. for example:
clickedId= test
wp_button_pointer_array[1] = { 'element' : 'test'
so here 'element' : 'test' = clickedId (test) then give me the array id. array id here is 1

 var wp_button_pointer_array = new Array();
 wp_button_pointer_array[1] = {
     'element' : 'wp-button-pointer',
     'options' : {
         'content': 'The HTML content to show inside the pointer', 
         'position': {'edge': 'top', 'align': 'center'} 
     } 
 }; 
 wp_button_pointer_array[2] = { 
     'element' : 'some-element-id', 
     'options' : { 
         'content': 'The HTML content to show inside the pointer', 
         'position': {'edge': 'top', 'align': 'center'} 
     }
};

on a JavaScript technical note, new array allocation uses ... = [];, not ... = new Array();, and in this case should just be wp_button_pointer_array = [ {...}, {...} ]; since JavaScript's basic syntax allows for arrays with content. First making an empty array and then filling it is usually discouraged unless the filling happens in dynamic code. — Mike 'Pomax' Kamermans
– Mike 'Pomax' Kamermans, Commented Aug 20, 2014 at 19:02
@Mike'Pomax'Kamermans new Array() can be used, and treated as a normal array. The difference is that it's using Constructor notation VS literal notation, so Array Object other than an Array. — Spencer Wieczorek
– Spencer Wieczorek, Commented Aug 20, 2014 at 19:06
while it can be because the spec allows for it, the language has dedicated syntax for array construction, and the use of new Array() is discouraged (not "bad", just discouraged - unlike new Array(size), which is usually bad unless you need to create a pre-length-assigned array that you then immediately collapse) — Mike 'Pomax' Kamermans
– Mike 'Pomax' Kamermans, Commented Aug 20, 2014 at 19:09

kirinthos · Accepted Answer · 2014-08-20 19:08:47Z

1

I'm not really sure that I understand your question, but is this what you're trying to do?

function findElementIdByName(arr, name) {
  for (var i = 0; i < arr.length; i++)
    if (arr[i].element == name)
      return i;
  return -1; //not found
}

//example call with your data
var eleId = findElementIdByName(wp_button_pointer_array, 'some-element-id');

side note: array indexing starts at 0 in javascript, and you can use new Array(), but [] is slightly faster (~80ms on average comp) due to lexical parsing in the javascript interpreter

answered Aug 20, 2014 at 19:08

kirinthos

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tetta · Accepted Answer · 2014-08-20 19:08:43Z

var wp_button_pointer_array = [
    {
        'element' : 'wp-button-pointer',
        'options' : {
            'content': 'The HTML content to show inside the pointer',
            'position': {'edge': 'top', 'align': 'center'}
        }
    },
    {
        'element' : 'some-element-id',
        'options' : {
            'content': 'The HTML content to show inside the pointer',
            'position': {'edge': 'top', 'align': 'center'}
        }

    }
];


$('a').on('click', function(){
    var clickedId = $(this).attr("id");
    for(var i = 0; i < wp_button_pointer_array.length; i++ ) {
        if(wp_button_pointer_array[i].element === clickedId) {
            //do staff with wp_button_pointer_array[i]
        }
    }
});

forgivenson · Accepted Answer · 2014-08-20 19:09:55Z

0

This will return the index that contains the given element property.

function getIndexByElementId(elementArray, elementId) {
    var i, len;
    for(i = 0, len = elementArray.length; i < len; i++) {
        if(elementArray[i].element === elementId) {
            return i;
        }
    }
}

answered Aug 20, 2014 at 19:09

forgivenson

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