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Yo what×39’s going on guys you're watching JavaScript for beginners a lesson 44 a din this video I want to go through Avery simple form validation script ah or anything Gong, so I've got exactly the same form up here in the HTML as the last lesson which is this thing over here IN×39’ve just added an empty diva the bottom and that×39’s got ID of message now I want to create a really, really simple form validation script which is going to check when someone clicks submit whether a name has been entered all right now it×39’s not that hardtop does this, but again this is a very simple validation script when you'redoing validation for real you×39’re going to want to dive a lot deeper but because this is a beginners course I want to start off lightly there is going to be whole playlist on forums in the futures stay tuned for that this is just an introduction all right there so let'jump over to this test j/s and start writing some code first thing I want to-do is put my own form in a variable sowed×39’ll create a variable called my form just like we did in the last lesson Andrew×39’ll set this equal to document dot forms and then remember from that we can grab the form right here busing this name alright so we×39’ll say dotty fault and then that stores the form in this variable now I want to create a second variable called message and that×39’s going to grab holder the element right he recalled message because we're going to update this with an error message if user fails to put in a name so we×39’ll say document dot get element by ID and then the ID is message all right cools owe've got those two variables now I want to introduce you to the on submit event now the on submit event is the event which occurs when you click Submit alright so normally what would happen is when you click Submit it would communicate with the server and do some kind of server-side validation and then return a result now we can interrupt this process using the on submit event do some kind of client-sidevalidation right here in the browser with JavaScript and if it's not to our liking we're done×39’t have to send it to the server, so we save all that time all that communication alright so let×39’s do that let's say my form dot on submit and notice the on submit method is on my form not the submit button itself all right that×39’s important, and we set that equal to a function and inside this function is where we'redoing to do a little of checking right, and I want to make sure that something has been entered into here, so basically I want to say if this is empty then I'm going to throw up an error message if it×39’s not empty then I'll return true and the form can process alright then, so we'll say if my form dot name because that's the name of this input field here done×39’t value is equal than empty string meaning their×39’s nothing in it then I'm going to throw up an error message and the message dotinnerhtmlthat'’s this element right here wilsatinin the inner HTML to be...
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