{"id":28066,"date":"2021-01-05T18:48:36","date_gmt":"2021-01-06T02:48:36","guid":{"rendered":"https:\/\/careerkarma.com\/blog\/?p=28066"},"modified":"2021-01-12T02:59:22","modified_gmt":"2021-01-12T10:59:22","slug":"js-alert","status":"publish","type":"post","link":"https:\/\/careerkarma.com\/blog\/js-alert\/","title":{"rendered":"JavaScript alert() Method"},"content":{"rendered":"\n<p>The JavaScript <code>alert()<\/code> method, also known as <code>Window.alert()<\/code>, displays an alert dialog box to a user. It accepts an optional message argument to display a message with an OK button to the user. Common uses for <code>alert()<\/code> are to let the user know an action was successful, or to display errors.<br><\/p>\n\n\n\n<p>The <code>alert()<\/code> method also comes in handy as a development tool. For example, placing an <code>alert()<\/code> inside a function to handle a form submission. Commonly, the <code>alert()<\/code> will be placed after <code>event.preventDefault()<\/code> is called.<br><\/p>\n\n\n\n<p>For review, <code>event.preventDefault()<\/code> simply cancels the default behavior of redirecting after the submit button is clicked. Read this quick <a href=\"https:\/\/www.w3schools.com\/jsref\/event_preventdefault.asp\" target=\"_blank\" rel=\"noopener\" rel=\"nofollow\">tutorial<\/a> to further review <code>event.preventDefault()<\/code>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is JavaScript alert()?<\/h2>\n\n\n\n<p>JavaScript <code>alert()<\/code> displays a pop-up dialog box. An optional message in the form of a string can be passed in to display a custom message. An important note about <code>alert()<\/code> is it should only be used to display a message that requires acknowledgement by clicking OK. A message requiring an action should not utilize <code>alert()<\/code>.<br><\/p>\n\n\n\n<p>An <code>alert()<\/code> dialog box has many uses. It can be used to display success or errors in the context of a <code>fetch()<\/code> request. Another use is to display <code>alert()<\/code> in a function to ensure the program is appropriately flowing.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">alert() JavaScript Syntax<\/h2>\n\n\n\n<p>The syntax for <code>alert()<\/code> is concise and straightforward. Simply invoke <code>alert()<\/code> with a message in the form of a string:<br><\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>alert('message')<\/pre><\/div>\n\n\n\n<p>This would display a dialog box that would say \u2018message.\u2019 Place your custom message as a string to display it.<br><\/p>\n\n\n\n<p>The message is optional. If a message is not included, a blank dialog box with an OK button appears.<br><\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>alert()<\/pre><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">JavaScript alert() Examples<\/h2>\n\n\n\n<p>In the introduction of this article, we considered a user and a developer scenario for using <code>alert()<\/code>. Let\u2019s now take a look at how each one would be implemented. Let\u2019s start with the developer side. We will put an <code>alert()<\/code> inside of a function that handles form submission.&nbsp;<br><\/p>\n\n\n\n<p>We will start with a basic form for logging in with a username and password.&nbsp;<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>&lt;form&gt;\n&lt;label&gt;Name&lt;\/label&gt;\n&lt;input type=&quot;text&quot; name=&quot;name&quot;&gt;\n&lt;label&gt;Password&lt;\/label&gt;\n&lt;input type=&quot;text&quot; name=&quot;name&quot;&gt;\n&lt;button type=&quot;submit&quot;&gt;\nLog In\n&lt;\/button&gt;\n&lt;\/form&gt;<\/pre><\/div>\n\n\n\n<p>Which renders:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh6.googleusercontent.com\/mLCDfjy1iblleL5clyn3Ghzw2BIrA1oRzbT4O-1mHnXypflpT_9sctJ9Zl5y9wTnTxGcmc3ZjIloAxpYuTsOLk8p5ix172NRBX_FC1FBuss6BHAgRW8iq_qR6mwaU24-pQOPM8BX\" alt=\"\"\/><\/figure>\n\n\n\n<p>Now let\u2019s build a function to pass to the onSubmit property of our JavaScript form.&nbsp;<br><\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>const handleOnSubmit = (event) =&gt; {\n event.preventDefault();\n alert(&quot;Logged In&quot;)\n}<\/pre><\/div>\n\n\n\n<p>Then we pass this function to our form in the onSubmit property.<br><\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>&lt;form onSubmit=&quot;handleOnSubmit(event)&quot;&gt;\n&lt;label&gt;Name&lt;\/label&gt;\n&lt;input type=&quot;text&quot; name=&quot;name&quot;&gt;\n&lt;label&gt;Password&lt;\/label&gt;\n&lt;input type=&quot;text&quot; name=&quot;name&quot;&gt;\n&lt;button type=&quot;submit&quot;&gt;\nLog In\n&lt;\/button&gt;\n&lt;\/form&gt;<\/pre><\/div>\n\n\n\n<p>Now we can click on the Login button to see if we\u2019ve wired the function to the form properly. After clicking the button we get a dialog box that looks like this:&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh4.googleusercontent.com\/2gKbjV3n-rGpVj1B7s2ButGGHMhcWLmZPhaK7tlBjG3TAzT_Ud0OVvshHmMJ3Ua6PdB4QNhtoepZhyYOHCVVJa8mIF4vm2HZlJYxhpANMI1NBN_v4QEMf1hUM3NQ0Tnp6JgW1gZR\" alt=\"\"\/><\/figure>\n\n\n\n<p>Great! We know that our function we defined is communicating with our form. JavaScript <code>alert()<\/code> gives us a simple way to check the flow of our program.<\/p>\n\n\n\n<p>For our next example, let\u2019s take a look at how we can expose success and error messages in a <code>fetch()<\/code> request.<br><\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>fetch('\/current-cart\/', {\n      credentials: 'include',\n      method: 'GET',\n      headers: {\n        'Content-Type': 'application\/json'\n      },\n    })\n    .then(resp =&gt; resp.json())\n    .then(cart =&gt; {\n      if(cart.error){\n        alert(cart.error)\n      }<\/pre><\/div>\n\n\n\n<p>In this example, we have a shopping cart fetch request in an e-commerce app. We are sending a request to see if a current shopping cart has been stored. Going through the request to the end, we have an <code>alert()<\/code> that will display errors, if any.&nbsp;<br><\/p>\n\n\n\n<p>Since there is not an active shopping cart we get this error:<br><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh5.googleusercontent.com\/TZ2ClSAvgCOCLI9QsEMk47tUkqAunrnnt745-XtLTFBX9btvSCaPukqr-KJGeG8XNNmUdr8hv6233Qqkt4hi-aEgnZNtl3XYHPhxvov-xutWhMkIEieu5cUmhhI0d8OEf3ErlCb1\" alt=\"\"\/><\/figure>\n\n\n\n<p>This example is more useful in development than production, but the same principles can be applied as validations on a form for example.<br><\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>return fetch('\/login', {\n      credentials: 'include',\n      method: 'POST',\n      headers: {\n        'Content-Type': 'application\/json'\n      },\n      body: JSON.stringify(creds)\n    })\n    .then(resp =&gt; resp.json())\n    .then(response =&gt; {\n      if (response.error) {\n        alert(response.error)\n      }<\/pre><\/div>\n\n\n\n<p>Here, the <code>alert()<\/code> will display the error messages associated with a log-in form. If a user tries to log-in without filling in the form, we get these errors:<br><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh4.googleusercontent.com\/fMSCkcJjfuBGgsgYT2y1LoOSDrKCUOMK3ydEYhiEIr4FbCwC7DPqzot1_88U5XAWOv1XBqyqKSBUPDcOp2wHHnMM9OSwxblOGRQ2bMXRhysRMD9sMSx08eLx5sC2t6KJ1G_hst2e\" alt=\"\"\/><\/figure>\n\n\n\n<p>This is an example of directing the user experience using <code>alert()<\/code> to display validations.&nbsp;<br><\/p>\n\n\n\n<p>We\u2019ve seen how <code>alert()<\/code> can be used both development side and client side \u2014 what the user sees. Let\u2019s take a moment to recap what we\u2019ve learned.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>JavaScript <code>alert()<\/code> is a simple method that has many broad uses. It takes an optional argument of a message as a string data type. It displays a dialog box with the message and an OK button. Remember that <code>alert()<\/code> is only meant to display messages and is not able to take any actions.&nbsp;<br><\/p>\n\n\n\n<p>In our examples, we saw how <code>alert()<\/code> can be used in development to track the communication of a function and a form. Then, we saw how <code>alert()<\/code> can expose error messages in the development side of a fetch request. In our final example, we saw how <code>alert()<\/code> can be used to deliver validation errors in a form to a user.<br><\/p>\n\n\n\n<p>By now, you should have a grasp on common uses for <code>alert()<\/code>. Try it out in your next JavaScript project as a way to test different functionalities.<\/p>\n","protected":false},"excerpt":{"rendered":"The JavaScript alert() method, also known as Window.alert(), displays an alert dialog box to a user. It accepts an optional message argument to display a message with an OK button to the user. Common uses for alert() are to let the user know an action was successful, or to display errors. The alert() method also&hellip;","protected":false},"author":104,"featured_media":17409,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[11933],"tags":[],"class_list":{"0":"post-28066","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-javascript"},"acf":{"post_sub_title":"","sprint_id":"","query_class":"JavaScript","school_sft":"","parent_sft":"","school_privacy_policy":"","has_review":null,"is_sponser_post":"","is_guest_post":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>JavaScript alert() Method | Career Karma<\/title>\n<meta name=\"description\" content=\"The JavaScript alert() method displays messages through a dialog box. 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