{"id":807,"date":"2022-08-30T15:07:30","date_gmt":"2022-08-30T15:07:30","guid":{"rendered":"https:\/\/unknownerror.org\/index.php\/2013\/11\/09\/backbone-jst-ejs-blank-values-in-templates-collection-of-common-programming-errors\/"},"modified":"2022-08-30T15:07:30","modified_gmt":"2022-08-30T15:07:30","slug":"backbone-jst-ejs-blank-values-in-templates-collection-of-common-programming-errors","status":"publish","type":"post","link":"https:\/\/unknownerror.org\/index.php\/2022\/08\/30\/backbone-jst-ejs-blank-values-in-templates-collection-of-common-programming-errors\/","title":{"rendered":"Backbone, JST, EJS: Blank values in templates-Collection of common programming errors"},"content":{"rendered":"

I have a JST–>EJS backbone template for a ‘projects’ form. Ideally, I’d like to use the same template for both creating and editing models.<\/p>\n

At the moment, I have something such as this in the template:<\/p>\n

\n<\/code><\/pre>\n
That works fine so long as demo_field has a value, but if it doesn’t, the whole form fails with an uncaught referenceError.<\/p>\n
So, what’s the most elegant way to assure variable fields return blank, instead of fail, in Backbone…or JST…or EJS?<\/p>\n
Cheers…<\/p>\n
    \n
  1. \n
    I’d probably make a helper, since javascript doesn’t have any nice way of doing something like field if field?<\/code> in CoffeeScript.<\/p>\n
    Throw something like this into a helper function:<\/p>\n
    function printIfExists(field) {\n  return (typeof field !== \"undefined\" && field !== null) ? field : '';\n}\n<\/code><\/pre>\n
    and call it in your templates. Easy as pie!<\/p>\n
    You might also want to use the alternate function<\/code> declaration:<\/p>\n
    var printIfExists = function(field){...}\n<\/code><\/pre>\n
    I’ve been using coffeescript so long I can’t recall why… scoping issues with the former example, probably.<\/p>\n<\/li>\n<\/ol>\n
    Originally posted 2013-11-09 22:46:42. <\/small><\/p>","protected":false},"excerpt":{"rendered":"
    I have a JST–>EJS backbone template for a ‘projects’ form. Ideally, I’d like to use the same template for both creating and editing models. At the moment, I have something such as this in the template: That works fine so long as demo_field has a value, but if it doesn’t, the whole form fails with […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-807","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/807","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/comments?post=807"}],"version-history":[{"count":0,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/807\/revisions"}],"wp:attachment":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/media?parent=807"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/categories?post=807"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/tags?post=807"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}