Validating a form using java script
.pass_color_to_child_links a.u-inline.u-margin-left--xs.u-margin-right--sm.u-padding-left--xs.u-padding-right--xs.u-absolute.u-absolute--center.u-width--100.u-flex-align-self--center.u-flex-justify--between.u-serif-font-main--regular.js-wf-loaded .u-serif-font-main--regular.amp-page .u-serif-font-main--regular.u-border-radius--ellipse.u-hover-bg--black-transparent.web_page .u-hover-bg--black-transparent:hover. Content Header .feed_item_answer_user.js-wf-loaded . I have Split it in one function that can validate the elements on "onchange" and another one that fires the validations for each element on form.onsubmit(), if there's the required data-message attribute on a form element.Since HTML5 the Data-* attributes are very handy for these things :-) This way you can avoid having to store the name of the form and elements in the validation script, since you pass references to the elements themselfes instead. From here you can expand the val El-function to accommodate other types of validation.You'll have to use the elements I explain on this page to build your own script.I created an example form and script that you can study to get the hang of it.
The Java Script check only works when the user has Java Script enabled.
That script is where you check whether certain fields have a value, whether the user has checked at least one checkbox, and any other checks you deem necessary.
The general syntax is: The advantage of using names is that you can put all elements somewhere else in the page and still have a working script, while a script using numbers will have to be changed.
In addition, when you use Java Script the server doesn't need to spend quite so much time in error handling and is thus a little quicker.
This only matters if you have lots and lots of forms, but it's good to keep it in mind. This event handler specifies a script that is executed when the user submits the form.