Question

I want to keep multiple templates in one external template file.
But i dont know how to get one template from the whole file

Answer 1

Your template collection needs to have different script tags (as the default inline usage of jsRender). Then you can load the collection file, find the requested part and render it, should work somehow likd this: (not tested, just theoretical)

my.renderUtils = (function () {
  // your template file (contains a set of script tags with ids)
  var templateFile = "template/file.html";
    renderTemplate = function (templateSelector, targetSelector, data) {
      $.get(templateFile, null, function (templateCollection) {
        var template = $(templateCollection).find( templateSelector ), /* find the correct part from the collection */
            tmpl = $.templates(template), /* rendering process */
            htmlString = tmpl.render(data);
        if (targetSelector) {
          $(targetSelector).html(htmlString); /* add it to your target */
        }
        return htmlString;
      });
    };
    return {
      renderExternalTemplate: renderTemplate
    };
})()

// usage 
my.renderUtils.renderExternalTemplate("yourTemplateFilePartID", "#yourTargetSelector", {yourdata:''}});