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Handling On/Off Checkbox State with JavaScript and Ajax

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[前端(javascript) 所属分类 前端(javascript) | 发布者 店小二04 | 时间 2016 | 作者 红领巾 ] 0人收藏点击收藏

This is a 1996 topic which remains relevant 20 years later. Checkboxes are old, but handling checkboxstate can still betricky. There are several ways to captureandsend the on/off state of a checkbox with javascript and Ajax, but I’m going to show you the surefire way to do it.

We have an “Is Latin” checkbox on a client application based on NixMash Spring . It’s a funky little effect which will italicize the title if the terma areLatin, popular withthe Medical Set. We also have a “Save and Continue” function in the Save button which sends the Post Data, including the “Is Latin” flag, to a Spring MVC endpoint with Ajax.


Handling On/Off Checkbox State with JavaScript and Ajax

Our “Is Latin” checkbox uses Thymeleaf and Spring to displayits state.


Handling On/Off Checkbox State with JavaScript and Ajax

Our “Save” button is nothing special.


Handling On/Off Checkbox State with JavaScript and Ajax

The gold ofthis post is in the savePost() function. The nugget of value is, ina phrase, USE THE DOM, LUKE!


Handling On/Off Checkbox State with JavaScript and Ajax

Of the varied ways to check if a checkbox is checked after being unchecked and vice versa, the most consistent wayto capture the on/off state of a Checkbox is to get the element by its DOM ID, in this case:

if (document.getElementById('isLatin').checked) {...}

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