Typeerror: Cannot Read Property 'text' of Undefined Innerhtml Angular 4
The innerHTML holding lets you set the contents of an element using JavaScript.
If yous specify an invalid element with which to apply the innerHTML method, or if y'all identify your script before the chemical element appears on the folio, you'll see the "Uncaught TypeError: cannot set property 'innerHTML' of null" fault.
In this guide, nosotros talk over what this mistake means and why yous may run across information technology. We'll walk through an instance of this error and so you can learn how to resolve it in your JavaScript lawmaking.
Uncaught TypeError: cannot gear up property 'innerHTML' of null
The innerHTML belongings is associated with any spider web element that you are working with in JavaScript. You may have selected a web element from the page using a "getter" like getElementById(), or y'all may have created an chemical element in JavaScript that you want to modify.
The "cannot set property 'innerHTML' of null" error is a type mistake. This means nosotros are trying to apply a property or a role to a value that does not support a belongings or function.
In this case, we're trying to set the value of innerHTML on an element that is equal to null. Null values exercise not have an innerHTML holding.
There are two common causes of this mistake:
- Placing a script before an element appears on the web page
- Referencing the wrong element ID.
We're going to walk through the start cause, which is arguably the most common error made by beginners.
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An Example Scenario
We're going to write a simple website that displays the time. To kickoff, ascertain a basic HTML page. This HTML page will be the canvas on which nosotros brandish the time:
<!DOCTYPE html> <html lang="en"> <head> <title>Fourth dimension</title> </head> <body> <p>The fourth dimension is <bridge id="show_time"></span>.</p> </body> </html>
This HTML page contains a <caput> and a <trunk> tag. The <head> tag contains a <title> tag which defines the title for the web page. The <body> tag contains a paragraph.
Within the paragraph, we take added a <span> tag. We're going to replace the contents of this tag with the current fourth dimension in our JavaScript code.
Next, write a script to retrieve the time. We'll add together this JS lawmaking within the <head> tag:
… <title>Time</title> <script> var show_time = document.getElementById("show_time"); var current_date = new Date(); var pretty_time = `${current_date.getHours()}:${current_date.getMinutes()}` show_time.innerHTML = pretty_time; </script> … Our certificate at present contains HTML and JavaScript. The getElementById() method retrieves our show_time span tag. We then retrieve the current appointment using the JavaScript Date module.
On the side by side line of code, nosotros create a string which displays the current hour of the solar day and the minute of the hour. This string uses the post-obit construction:
HH:MM
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There is a colon that separates the hour and minute values. We create this cord using a technique called JavaScript string interpolation. This lets the states embed multiple values into the aforementioned string. Finally, we use the innerHTML method to display this time on our web page.
Let's open up our web page in the spider web browser:
Our web page fails to display the time. If we expect at the JavaScript panel, nosotros can meet an error:
Uncaught TypeError: show_time is null
This is another representation of the "cannot set property 'innerhtml' of nothing". It tells us the chemical element on which we are trying to set the value of innerHTML is zilch.
The Solution
Because the value of show_time is null, we tin infer that JavaScript was unable to successfully call up the element whose ID is show_time.
In this instance, the cause is that we have placed our <script> tag too early in our program. Our <script> tag appears in the header of our page. This is a problem because without using an onload() function, we tin can simply select elements that come earlier our <script>.
To solve this fault, we need to move our <script> below our paragraph:
... <body> <p>The time is <bridge id="show_time"></span>.</p> </body> <script> var show_time = document.getElementById("show_time"); var current_date = new Engagement(); var pretty_time = `${current_date.getHours()}:${current_date.getMinutes()}` show_time.innerHTML = pretty_time; </script> … We accept moved our <script> tag below the <torso> tag. Let's try to open our spider web page over again:
The web folio successfully displays the time.
If this does not solve the mistake for y'all, make sure that you correctly select the element that you lot want to work with in your code. For instance, consider this line of code:
var show_time = certificate.getElementById("show_times"); If we used this line of code to select our element, we would come across the same error that we encountered before. This is considering there is no chemical element whose ID is "show_times".
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Conclusion
The "Uncaught TypeError: cannot prepare belongings 'innerHTML' of zilch" error is caused by trying to set an innerHTML value for an chemical element whose value is equal to nothing.
To solve this error, make sure your <script> tag comes afterward the element that you want to select in your script. If this does not solve the consequence, check to make certain you are selecting a valid element in your programme.
Source: https://careerkarma.com/blog/javascript-cannot-set-property-innerhtml-of-null/
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