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In your SharePoint Online Communication site, click the Gear icon in the upper-right corner and select Change The Look:
- Within the Change The Look options, select Footer:
- To make the footer visible on your site pages, turn the Footer Visibility option to On:
It’s always a good practice to add jQuery code in footer i.e. just before the closing tag. If you have not done that, then use the defer attribute. The defer attribute is used to specify that the script execution occurs when the page loads. It is useful only for external scripts and is a boolean attribute.
Should javascript be in header or footer?
Javascript should be placed in footer of html document wherever possible. For libraries like jQuery we don’t often have a choice as there may be some other javascript code which depends on that. But we should design site in such a way that maximum javascript code is placed in the end.
Use headers and footers to add a title, date, or page numbers to every page in a document. Select Insert > Header or Footer. Select one of the built in designs. Type the text you want in the header or footer.
Or you can download the jQuery file and save it in a SharePoint site assets library and we can give reference from there. Once you have Saved the jQuery file, you can open any web part page and then click on Add a web part and then select the script editor web part from the Media and Content category.
How to create a placeholder for a footer?
In this case, the code is accessing the footer section of the page by using the Bottom option on the PlaceholderName enum. Install the @microsoft/sp-office-ui-fabric-core package to enable importing from SPFabricCore.scss. We’ll use this for defining rendering styles for our place holders.
For example, you can create dynamic header and footer experiences that render across all the pages in SharePoint Online. This model is similar to using a UserCustomAction collection in a Site or Web object to modify the page experience via custom JavaScript.
How to add jQuery to a web page?
First, edit the page on which you want to call the jQuery libraries. Then on one of the webpart zone click on Add a Web Part. Then from the Media and Content category section select Content Editor web part and click on Add as shown in the figure below.