dojo.isString

since:V?

Contents

• dojo.isString
  • Usage
  • Examples
  • See also

Checks if the parameter is a String.

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

Usage

Use this to test if a variable is a string

// Dojo 1.7 (AMD)
require(["dojo/_base/lang"], function(lang){
  if(lang.isString(foo)){ ...
});
// Dojo < 1.7
if(dojo.isString(foo)){ ...

// Dojo 1.7 (AMD) require(["dojo/_base/lang"], function(lang){ if(lang.isString(foo)){ ... }); // Dojo < 1.7 if(dojo.isString(foo)){ ...

Examples

Test against isString()

.style1 { background: #f1f1f1; padding: 10px; }

.style1 { background: #f1f1f1; padding: 10px; }

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 Array?
    if(dojo.isString(t)){
        // dojooo: t is a string!
        dojo.attr(resultDiv, "innerHTML",
            "Yes, good choice: 't' is a string.<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 a string 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"
        });
    }
}

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 Array? if(dojo.isString(t)){ // dojooo: t is a string! dojo.attr(resultDiv, "innerHTML", "Yes, good choice: 't' is a string.<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 a string 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" }); } }

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

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

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

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

            // Test the type of t:
            testIt();
        </script>
    </button>
    <button data-dojo-type="dijit.form.Button">
        t = function(a, b){ return a };
        <script type="dojo/method" data-dojo-event="onClick" data-dojo-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 data-dojo-type="dijit.form.Button"> t = 1000; <script type="dojo/method" data-dojo-event="onClick" data-dojo-args="evt"> // Set t: t = 1000; // Test the type of t: testIt(); </script> </button> <button data-dojo-type="dijit.form.Button"> t = "text"; <script type="dojo/method" data-dojo-event="onClick" data-dojo-args="evt"> // Set t: t = "text"; // Test the type of t: testIt(); </script> </button> <button data-dojo-type="dijit.form.Button"> t = [1, 2, 3]; <script type="dojo/method" data-dojo-event="onClick" data-dojo-args="evt"> // Set t: t = [1, 2, 3]; // Test the type of t: testIt(); </script> </button> <button data-dojo-type="dijit.form.Button"> t = { "property": 'value' }; <script type="dojo/method" data-dojo-event="onClick" data-dojo-args="evt"> // Set t: t = { "property": 'value' }; // Test the type of t: testIt(); </script> </button> <button data-dojo-type="dijit.form.Button"> t = function(a, b){ return a }; <script type="dojo/method" data-dojo-event="onClick" data-dojo-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.isArray - Checks if the parameter is an Array
• dojo.isFunction - Checks if the parameter is a Function
• dojo.isObject - Checks if the parameter is an Object
• 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.isString
  • Usage
  • Examples
    • Test against isString()
  • See also