dojo.isObject

Status:Draft Version:1.0 Available:since V?

Contents

• dojo.isObject
  • Usage
  • Examples
  • See also

Checks if the parameter is an Object.

As with all dojo._base components, these functions are included within Dojo Base. You get this functionality by just including dojo.js or dojo.xd.js in your page.

Usage

Use this to test if a variable is an Object.

dojo.isObject(foo)

Returns true if it is a JavaScript object (or an Array, a Function or null).

// Check, if variable "foo" is an object:
if(dojo.isObject(foo)){
    // do something...
}

Examples

Test against isObject()

<style type="text/css">
    .style1 { background: #f1f1f1; padding: 10px; }
</style>

<style type="text/css"> .style1 { background: #f1f1f1; padding: 10px; } </style>

<script type="text/javascript">
    dojo.require("dijit.form.Button");

    // test variable t:
    var t;

    function testIt() {
        // resultDiv is the spanning DIV around the result:
        var resultDiv = dojo.byId('resultDiv');

        // Here comes the test:
        // Is t an Object?
        if (dojo.isObject(t)) {
            // dojooo: t is an object!
            dojo.attr(resultDiv, "innerHTML",
                "Yes, good choice: 't' is an object.<br />Try another button.");

            // Change the backgroundColor:
            dojo.style(resultDiv, {
                "backgroundColor": "#a4e672",
                "color": "black"
            });
        } else {
            // no chance, this can't be an array:
            dojo.attr(resultDiv, "innerHTML",
                "No chance: 't' can't be an object with such a value "
                 + "('t' seems to be a " + typeof t + ").<br />"
                 + "Try another button.");


            // Change the backgroundColor:
            dojo.style(resultDiv, {
                "backgroundColor": "#e67272",
                "color": "white"
            });
        }
    }
</script>

<script type="text/javascript"> dojo.require("dijit.form.Button"); // test variable t: var t; function testIt() { // resultDiv is the spanning DIV around the result: var resultDiv = dojo.byId('resultDiv'); // Here comes the test: // Is t an Object? if (dojo.isObject(t)) { // dojooo: t is an object! dojo.attr(resultDiv, "innerHTML", "Yes, good choice: 't' is an object.<br />Try another button."); // Change the backgroundColor: dojo.style(resultDiv, { "backgroundColor": "#a4e672", "color": "black" }); } else { // no chance, this can't be an array: dojo.attr(resultDiv, "innerHTML", "No chance: 't' can't be an object with such a value " + "('t' seems to be a " + typeof t + ").<br />" + "Try another button."); // Change the backgroundColor: dojo.style(resultDiv, { "backgroundColor": "#e67272", "color": "white" }); } } </script>

<div style="height: 100px;">
    <button dojoType="dijit.form.Button">
        t = 1000;
        <script type="dojo/method" event="onClick" args="evt">
            // Set t:
            t = 1000;

            // Test the type of t:
            testIt();
        </script>
    </button>
    <button dojoType="dijit.form.Button">
        t = "text";
        <script type="dojo/method" event="onClick" args="evt">
            // Set t:
            t = "text";

            // Test the type of t:
            testIt();
        </script>
    </button>
    <button dojoType="dijit.form.Button">
        t = [1, 2, 3];
        <script type="dojo/method" event="onClick" args="evt">
            // Set t:
            t = [1, 2, 3];

            // Test the type of t:
            testIt();
        </script>
    </button>
    <button dojoType="dijit.form.Button">
        t = { "property": 'value' };
        <script type="dojo/method" event="onClick" args="evt">
            // Set t:
            t = { "property": 'value' };

            // Test the type of t:
            testIt();
        </script>
    </button>
    <button dojoType="dijit.form.Button">
        t = function(a, b){ return a };
        <script type="dojo/method" event="onClick" args="evt">
            // Set t:
            t = function(a, b){ return a } ;

            // Test the type of t:
            testIt();
        </script>
    </button>

    <div id="resultDiv" class="style1">
        Click on a button, to test the associated value.
    </div>
</div>

<div style="height: 100px;"> <button dojoType="dijit.form.Button"> t = 1000; <script type="dojo/method" event="onClick" args="evt"> // Set t: t = 1000; // Test the type of t: testIt(); </script> </button> <button dojoType="dijit.form.Button"> t = "text"; <script type="dojo/method" event="onClick" args="evt"> // Set t: t = "text"; // Test the type of t: testIt(); </script> </button> <button dojoType="dijit.form.Button"> t = [1, 2, 3]; <script type="dojo/method" event="onClick" args="evt"> // Set t: t = [1, 2, 3]; // Test the type of t: testIt(); </script> </button> <button dojoType="dijit.form.Button"> t = { "property": 'value' }; <script type="dojo/method" event="onClick" args="evt"> // Set t: t = { "property": 'value' }; // Test the type of t: testIt(); </script> </button> <button dojoType="dijit.form.Button"> t = function(a, b){ return a }; <script type="dojo/method" event="onClick" args="evt"> // Set t: t = function(a, b){ return a } ; // Test the type of t: testIt(); </script> </button> <div id="resultDiv" class="style1"> Click on a button, to test the associated value. </div> </div>

See also

• dojo.isString - Checks if the parameter is a String
• dojo.isArray - Checks if the parameter is an Array
• dojo.isFunction - Checks if the parameter is a Function
• dojo.isArrayLike - Checks if the parameter is like an Array
• dojo.isAlien - Checks if the parameter is a built-in function

Table of Contents

• dojo.isObject
  • Usage
  • Examples
    • Test against isObject()
  • See also